updated some git info views

backend/internal/git/browse.go

@@ -20,6 +20,7 @@ type CommitDetail struct {
 	Email   string       `json:"email"`
 	When    string       `json:"when"`
 	Message string       `json:"message"`
+	Parents []string     `json:"parents"`
 	Files   []CommitFile `json:"files"`
 }
 
@@ -294,9 +295,12 @@ func ListFileHistory(repoPath string, ref string, filePath string, limit int) ([
 	return commits, nil
 }
 
-func DiffFile(repoPath, ref, path string) (string, error) {
+// DiffFile returns the patch for path as it changed in the commit named by ref,
+// diffed against that commit's first parent. It also returns the two commit
+// hashes involved: to is the commit's hash, from is its first parent's hash
+// (empty for a root commit, in which case the diff is empty).
+func DiffFile(repoPath, ref, path string) (diffText string, fromHash string, toHash string, err error) {
 	var repo *git2go.Repository
-	var err error
 	var commit *git2go.Commit
 	var parent *git2go.Commit
 	var commitTree *git2go.Tree
@@ -307,50 +311,52 @@ func DiffFile(repoPath, ref, path string) (string, error) {
 
 	repo, err = git2go.OpenRepository(repoPath)
 	if err != nil {
-		return "", err
+		return "", "", "", err
 	}
 	defer repo.Free()
 
 	commit, err = resolveCommit(repo, ref)
 	if err != nil {
-		return "", err
+		return "", "", "", err
 	}
 	defer commit.Free()
+	toHash = commit.Id().String()
 
 	if commit.ParentCount() == 0 {
-		return "", nil
+		return "", "", toHash, nil
 	}
 	parent = commit.Parent(0)
 	defer parent.Free()
+	fromHash = parent.Id().String()
 
 	commitTree, err = commit.Tree()
 	if err != nil {
-		return "", err
+		return "", "", "", err
 	}
 	defer commitTree.Free()
 	parentTree, err = parent.Tree()
 	if err != nil {
-		return "", err
+		return "", "", "", err
 	}
 	defer parentTree.Free()
 
 	diffOpts, err = git2go.DefaultDiffOptions()
 	if err != nil {
-		return "", err
+		return "", "", "", err
 	}
 	diffOpts.Pathspec = []string{path}
 
 	diff, err = repo.DiffTreeToTree(parentTree, commitTree, &diffOpts)
 	if err != nil {
-		return "", err
+		return "", "", "", err
 	}
 	defer diff.Free()
 
 	buf, err = diff.ToBuf(git2go.DiffFormatPatch)
 	if err != nil {
-		return "", err
+		return "", "", "", err
 	}
-	return string(buf), nil
+	return string(buf), fromHash, toHash, nil
 }
 
 func GetCommitDetail(repoPath, hash string) (CommitDetail, error) {
@@ -365,8 +371,11 @@ func GetCommitDetail(repoPath, hash string) (CommitDetail, error) {
 	var findOpts git2go.DiffFindOptions
 	var diff *git2go.Diff
 	var files []CommitFile
+	var parents []string
+	var parentCount uint
 	var numDeltas int
 	var i int
+	var p uint
 
 	repo, err = git2go.OpenRepository(repoPath)
 	if err != nil {
@@ -384,6 +393,11 @@ func GetCommitDetail(repoPath, hash string) (CommitDetail, error) {
 	}
 	defer commit.Free()
 
+	parentCount = commit.ParentCount()
+	for p = 0; p < parentCount; p++ {
+		parents = append(parents, commit.ParentId(p).String())
+	}
+
 	commitTree, err = commit.Tree()
 	if err != nil {
 		return CommitDetail{}, err
@@ -454,6 +468,7 @@ func GetCommitDetail(repoPath, hash string) (CommitDetail, error) {
 		Email:   commit.Author().Email,
 		When:    commit.Author().When.UTC().Format(timeFormat),
 		Message: strings.TrimSpace(commit.Message()),
+		Parents: parents,
 		Files:   files,
 	}, nil
 }

backend/internal/handlers/api.go

@@ -3838,6 +3838,8 @@ func (api *API) RepoFileDiff(w http.ResponseWriter, r *http.Request, params map[
 	var ref string
 	var path string
 	var diff string
+	var fromHash string
+	var toHash string
 	var unlock func()
 	var ok bool
 
@@ -3850,12 +3852,12 @@ func (api *API) RepoFileDiff(w http.ResponseWriter, r *http.Request, params map[
 		WriteJSONWithErrorReason(w, r, http.StatusBadRequest, "path required")
 		return
 	}
-	diff, err = git.DiffFile(repo.Path, ref, path)
+	diff, fromHash, toHash, err = git.DiffFile(repo.Path, ref, path)
 	if err != nil {
 		WriteJSONWithErrorReason(w, r, http.StatusInternalServerError, err.Error())
 		return
 	}
-	WriteJSON(w, http.StatusOK, map[string]string{"path": path, "diff": diff})
+	WriteJSON(w, http.StatusOK, map[string]string{"path": path, "diff": diff, "from": fromHash, "to": toHash})
 }
 
 func (api *API) RepoCommitDetail(w http.ResponseWriter, r *http.Request, params map[string]string) {

frontend/src/api.ts

@@ -299,6 +299,7 @@ export interface RepoCommit {
 }
 
 export interface RepoCommitDetail extends RepoCommit {
+	parents: string[]
 	files: { path: string; status: string }[]
 }
 
@@ -2027,7 +2028,7 @@ export const api = {
 		const params = new URLSearchParams()
 		if (ref) params.set('ref', ref)
 		params.set('path', path)
-		return request<{ path: string; diff: string }>(`/api/repos/${repoId}/diff?${params.toString()}`)
+		return request<{ path: string; diff: string; from: string; to: string }>(`/api/repos/${repoId}/diff?${params.toString()}`)
 	},
 	getRepo: (repoId: string) => request<Repo>(`/api/repos/${repoId}`),
 	getRepoCommitDetail: (repoId: string, hash: string) =>

frontend/src/components/AuthProviderDetailsDialog.tsx

@@ -8,6 +8,7 @@ import TextField from '@mui/material/TextField'
 import Typography from '@mui/material/Typography'
 import FormDialogContent from './FormDialogContent'
 import { AuthProvider, AuthProviderGroupMapping, UserGroup } from '../api'
+import { formatEpochTime } from '../time'
 
 type AuthProviderDetailsDialogProps = {
 	item: AuthProvider | null
@@ -19,7 +20,7 @@ function fmt(value: number | undefined): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function yesNo(value: boolean): string {

frontend/src/components/CodeBlock.tsx

@@ -41,6 +41,9 @@ export default function CodeBlock({ code = '', language = 'diff', showLineNumber
 				padding: 0,
 				whiteSpace: 'pre',
 				overflow: 'auto',
+				width: '100%',
+				maxWidth: '100%',
+				minWidth: 0,
 				backgroundColor: 'transparent',
 				lineHeight: 1.4,
 				fontSize: '0.85rem',

frontend/src/components/CommitMeta.tsx

@@ -0,0 +1,202 @@
+import { Box, Button, Chip, IconButton, Tooltip, Typography } from '@mui/material'
+import type { BoxProps } from '@mui/material/Box'
+import { Link as RouterLink } from 'react-router-dom'
+import { useState } from 'react'
+import ContentCopyIcon from '@mui/icons-material/ContentCopy'
+import ExpandMoreIcon from '@mui/icons-material/ExpandMore'
+import ExpandLessIcon from '@mui/icons-material/ExpandLess'
+import { formatCommitTime } from '../time'
+
+// splitCommitMessage separates a git commit message into its subject (first
+// line) and body (everything after the first blank-separated line).
+export function splitCommitMessage(message: string | null | undefined): { subject: string; body: string } {
+	const text = (message || '').replace(/\r\n/g, '\n')
+	const newline = text.indexOf('\n')
+	if (newline < 0) {
+		return { subject: text.trim(), body: '' }
+	}
+	return { subject: text.slice(0, newline).trim(), body: text.slice(newline + 1).replace(/^\n+/, '').trimEnd() }
+}
+
+function copyToClipboard(text: string): void {
+	if (!text) return
+	if (navigator.clipboard && 'writeText' in navigator.clipboard) {
+		navigator.clipboard.writeText(text).catch(() => {})
+	}
+}
+
+type CommitIdentityProps = {
+	author?: string
+	email?: string
+	when?: string
+	hash?: string
+	// When set, the short hash links to this route. Rendered as a Chip when
+	// hashChip is true, otherwise as an inline link (safe inside list rows).
+	hashHref?: string
+	hashChip?: boolean
+	// Show the email explicitly as "author <email>"; otherwise it appears in a
+	// tooltip on the author name.
+	showEmail?: boolean
+	// Show an email copy button. Only use outside of <a>/<button> rows.
+	copy?: boolean
+	// Show a copy-commit-id button next to the hash (suppressed when the hash is
+	// itself a copy-chip). Only use outside of <a>/<button> rows.
+	copyHash?: boolean
+	sx?: BoxProps['sx']
+}
+
+// CommitIdentity renders the author / email / short-hash / local-time metadata
+// line for a commit. Its root is an inline span so it is valid inside a
+// ListItemText secondary slot.
+export function CommitIdentity(props: CommitIdentityProps) {
+	const { author, email, when, hash, hashHref, hashChip, showEmail, copy, copyHash, sx } = props
+	const authorLabel = showEmail && email ? `${author || 'Unknown'} <${email}>` : author || 'Unknown'
+	const authorNode = (
+		<Typography variant="body2" color="text.secondary" component="span" noWrap>
+			{authorLabel}
+		</Typography>
+	)
+	let hashNode = null
+	if (hash) {
+		const short = hash.slice(0, 8)
+		if (hashChip && hashHref) {
+			hashNode = (
+				<Tooltip title={hash}>
+					<Chip component={RouterLink} to={hashHref} label={short} size="small" clickable sx={{ fontFamily: 'monospace' }} />
+				</Tooltip>
+			)
+		} else if (hashChip) {
+			// No link target (e.g. the commit's own page): make the chip copy the hash.
+			hashNode = (
+				<Tooltip title="Copy commit id">
+					<Chip label={short} size="small" clickable onClick={() => copyToClipboard(hash)} sx={{ fontFamily: 'monospace' }} />
+				</Tooltip>
+			)
+		} else if (hashHref) {
+			hashNode = (
+				<Tooltip title={hash}>
+					<Typography
+						variant="body2"
+						color="text.secondary"
+						component={RouterLink}
+						to={hashHref}
+						onClick={(event) => event.stopPropagation()}
+						sx={{ fontFamily: 'monospace', textDecoration: 'none', '&:hover': { textDecoration: 'underline' } }}
+					>
+						{short}
+					</Typography>
+				</Tooltip>
+			)
+		} else {
+			hashNode = (
+				<Tooltip title={hash}>
+					<Typography variant="body2" color="text.secondary" component="span" sx={{ fontFamily: 'monospace' }}>
+						{short}
+					</Typography>
+				</Tooltip>
+			)
+		}
+	}
+	return (
+		<Box component="span" sx={[{ display: 'inline-flex', alignItems: 'center', gap: 1, flexWrap: 'wrap', minWidth: 0 }, ...(Array.isArray(sx) ? sx : sx ? [sx] : [])]}>
+			{email && !showEmail ? <Tooltip title={email}>{authorNode}</Tooltip> : authorNode}
+			{copy && email ? (
+				<Tooltip title="Copy email">
+					<IconButton size="small" onClick={() => copyToClipboard(email)} aria-label="Copy email">
+						<ContentCopyIcon sx={{ fontSize: 14 }} />
+					</IconButton>
+				</Tooltip>
+			) : null}
+			{hashNode}
+			{copyHash && hash && !(hashChip && !hashHref) ? (
+				<Tooltip title="Copy commit id">
+					<IconButton size="small" onClick={() => copyToClipboard(hash)} aria-label="Copy commit id">
+						<ContentCopyIcon sx={{ fontSize: 14 }} />
+					</IconButton>
+				</Tooltip>
+			) : null}
+			{when ? (
+				<Typography variant="body2" color="text.secondary" component="span" sx={{ whiteSpace: 'nowrap' }}>
+					{formatCommitTime(when)}
+				</Typography>
+			) : null}
+		</Box>
+	)
+}
+
+type CommitMessageProps = {
+	message: string | null | undefined
+	// inline: single-line subject with an expand toggle to reveal the body
+	// (for tight headers). Default (full): subject + body shown, with a
+	// "Show more/less" toggle only when the body is long.
+	inline?: boolean
+	collapseAfterLines?: number
+}
+
+// CommitMessage shows a commit's subject and, when present, its body. The body
+// preserves line breaks in a monospace block.
+export function CommitMessage(props: CommitMessageProps) {
+	const { message, inline, collapseAfterLines = 8 } = props
+	const { subject, body } = splitCommitMessage(message)
+	const hasBody = body.length > 0
+	const [expanded, setExpanded] = useState(false)
+
+	if (inline) {
+		return (
+			<Box sx={{ minWidth: 0 }}>
+				<Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5, minWidth: 0 }}>
+					<Typography variant="body2" sx={{ flex: 1, minWidth: 0 }} noWrap={!expanded}>
+						{subject || 'No commit message'}
+					</Typography>
+					{hasBody ? (
+						<IconButton
+							size="small"
+							onClick={() => setExpanded((value) => !value)}
+							aria-label={expanded ? 'Collapse commit message' : 'Expand commit message'}
+						>
+							{expanded ? <ExpandLessIcon fontSize="small" /> : <ExpandMoreIcon fontSize="small" />}
+						</IconButton>
+					) : null}
+				</Box>
+				{expanded && hasBody ? (
+					<Typography variant="body2" color="text.secondary" component="pre" sx={{ whiteSpace: 'pre-wrap', fontFamily: 'monospace', m: 0, mt: 0.5 }}>
+						{body}
+					</Typography>
+				) : null}
+			</Box>
+		)
+	}
+
+	const bodyLines = hasBody ? body.split('\n').length : 0
+	const collapsible = bodyLines > collapseAfterLines
+	return (
+		<Box sx={{ minWidth: 0 }}>
+			<Typography variant="subtitle2" sx={{ fontWeight: 600 }}>
+				{subject || 'No commit message'}
+			</Typography>
+			{hasBody ? (
+				<>
+					<Typography
+						variant="body2"
+						color="text.secondary"
+						component="pre"
+						sx={{
+							whiteSpace: 'pre-wrap',
+							fontFamily: 'monospace',
+							m: 0,
+							mt: 0.5,
+							...(collapsible && !expanded ? { maxHeight: 160, overflow: 'hidden' } : {})
+						}}
+					>
+						{body}
+					</Typography>
+					{collapsible ? (
+						<Button size="small" onClick={() => setExpanded((value) => !value)} sx={{ textTransform: 'none', px: 0, minWidth: 0 }}>
+							{expanded ? 'Show less' : 'Show more'}
+						</Button>
+					) : null}
+				</>
+			) : null}
+		</Box>
+	)
+}

frontend/src/components/LazyCodeBlock.tsx

@@ -22,6 +22,9 @@ export default function LazyCodeBlock(props: LazyCodeBlockProps) {
 						p: 0,
 						whiteSpace: 'pre',
 						overflow: 'auto',
+						width: '100%',
+						maxWidth: '100%',
+						minWidth: 0,
 						//fontFamily: 'ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, Liberation Mono, monospace'
 					}}
 				>

frontend/src/components/PKICADetailsDialog.tsx

@@ -8,6 +8,7 @@ import TextField from '@mui/material/TextField'
 import FormDialogContent from './FormDialogContent'
 import MonospaceTextField from './MonospaceTextField'
 import { PKICADetail } from '../api'
+import { formatEpochTime } from '../time'
 
 type PKICADetailsDialogProps = {
 	item: PKICADetail | null
@@ -23,7 +24,7 @@ function fmt(value: number | undefined): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function PKICADetailsDialog(props: PKICADetailsDialogProps) {

frontend/src/components/PKICertDetailsDialog.tsx

@@ -9,6 +9,7 @@ import type { ReactNode } from 'react'
 import FormDialogContent from './FormDialogContent'
 import MonospaceTextField from './MonospaceTextField'
 import { PKICertDetail } from '../api'
+import { formatEpochTime } from '../time'
 
 type PKICertDetailsDialogProps = {
 	item: PKICertDetail | null
@@ -33,7 +34,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function PKICertDetailsDialog(props: PKICertDetailsDialogProps) {

frontend/src/components/PKIClientProfileDetailsDialog.tsx

@@ -6,6 +6,7 @@ import DialogTitle from '@mui/material/DialogTitle'
 import TextField from '@mui/material/TextField'
 import FormDialogContent from './FormDialogContent'
 import { PKIClientProfile } from '../api'
+import { formatEpochTime } from '../time'
 
 type PKIClientProfileDetailsDialogProps = {
 	item: PKIClientProfile | null
@@ -17,7 +18,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function PKIClientProfileDetailsDialog(props: PKIClientProfileDetailsDialogProps) {

frontend/src/components/ProjectOverviewCard.tsx

@@ -4,6 +4,7 @@ import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import SectionCard from './SectionCard'
 import { Project } from '../api'
+import { formatEpochTime } from '../time'
 import { ReactNode } from 'react'
 
 type ProjectOverviewCardProps = {
@@ -24,7 +25,7 @@ export default function ProjectOverviewCard({ project, actions }: ProjectOvervie
 						) : null}
 						{project.created_at ? (
 							<Typography variant="body2" color="text.secondary">
-								Created: {new Date(project.created_at * 1000).toLocaleString()}
+								Created: {formatEpochTime(project.created_at)}
 							</Typography>
 						) : null}
 						{project.updated_by_name || project.updated_by ? (
@@ -34,7 +35,7 @@ export default function ProjectOverviewCard({ project, actions }: ProjectOvervie
 						) : null}
 						{project.updated_at ? (
 							<Typography variant="body2" color="text.secondary">
-								Last updated: {new Date(project.updated_at * 1000).toLocaleString()}
+								Last updated: {formatEpochTime(project.updated_at)}
 							</Typography>
 						) : null}
 					</Box>

frontend/src/components/RepoRpmDirectoryStatusDialog.tsx

@@ -9,6 +9,7 @@ import FormDialogContent from './FormDialogContent'
 import PageAlert from './PageAlert'
 import ContentCopyIcon from '@mui/icons-material/ContentCopy'
 import { RpmMirrorRun } from '../api'
+import { formatEpochTime } from '../time'
 
 type RepoRpmDirectoryStatusDialogProps = {
 	open: boolean
@@ -114,7 +115,7 @@ export default function RepoRpmDirectoryStatusDialog(props: RepoRpmDirectoryStat
 								{props.runs.length ? (
 									props.runs.map((run: RpmMirrorRun) => (
 										<Typography key={run.id} variant="caption" color={run.status === 'failed' ? 'error' : 'text.secondary'}>
-											{new Date((run.started_at || 0) * 1000).toLocaleString()} · {run.status} · {run.done}/{run.total} · fail {run.failed} · del {run.deleted}
+											{formatEpochTime(run.started_at)} · {run.status} · {run.done}/{run.total} · fail {run.failed} · del {run.deleted}
 										</Typography>
 									))
 								) : (

frontend/src/components/RepoSubNav.tsx

@@ -16,11 +16,22 @@ type RepoNavItem = {
 	active: boolean
 }
 
+function storedRepoCodePath(repoId: string, fallback: string, basePath: string): string {
+	var stored: string | null
+
+	if (typeof window === 'undefined') return fallback
+	stored = window.sessionStorage.getItem(`repo-nav:${repoId}:code`)
+	if (!stored) return fallback
+	if (!stored.startsWith(basePath)) return fallback
+	return stored
+}
+
 export default function RepoSubNav(props: RepoSubNavProps) {
 	const { projectId, repoId, branchRef, repoType, inline } = props
 	const location = useLocation()
 	const base: string = `/projects/${projectId}/repos/${repoId}`
 	const refSuffix: string = branchRef ? `?ref=${encodeURIComponent(branchRef)}` : ''
+	const codePath: string = storedRepoCodePath(repoId, `${base}${refSuffix}`, base)
 	const currentPath: string = location.pathname.replace(/\/+$/, '')
 	const basePath: string = base.replace(/\/+$/, '')
 	const isRPM: boolean = repoType === 'rpm'
@@ -34,7 +45,7 @@ export default function RepoSubNav(props: RepoSubNavProps) {
 	] : [
 		{
 			label: 'Code',
-			path: `${base}${refSuffix}`,
+			path: codePath,
 			active: currentPath === basePath,
 		},
 		{

frontend/src/components/SSHAccessProfileDetailsDialog.tsx

@@ -6,6 +6,7 @@ import DialogTitle from '@mui/material/DialogTitle'
 import TextField from '@mui/material/TextField'
 import FormDialogContent from './FormDialogContent'
 import { SSHAccessProfile } from '../api'
+import { formatEpochTime } from '../time'
 
 type SSHAccessProfileDetailsDialogProps = {
 	item: SSHAccessProfile | null
@@ -17,7 +18,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function SSHAccessProfileDetailsDialog(props: SSHAccessProfileDetailsDialogProps) {

frontend/src/components/SSHCertificateIssuedDialog.tsx

@@ -11,6 +11,7 @@ import Tooltip from '@mui/material/Tooltip'
 import Typography from '@mui/material/Typography'
 import FormDialogContent from './FormDialogContent'
 import type { SSHSignUserKeyResponse } from '../api'
+import { formatEpochTime } from '../time'
 
 type SSHCertificateIssuedDialogProps = {
 	open: boolean
@@ -27,7 +28,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function SSHCertificateIssuedDialog(props: SSHCertificateIssuedDialogProps) {

frontend/src/components/SSHCredentialDetailsDialog.tsx

@@ -7,6 +7,7 @@ import TextField from '@mui/material/TextField'
 import FormDialogContent from './FormDialogContent'
 import MonospaceTextField from './MonospaceTextField'
 import { SSHCredential } from '../api'
+import { formatEpochTime } from '../time'
 
 type SSHCredentialDetailsDialogProps = {
 	item: SSHCredential | null
@@ -18,7 +19,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function SSHCredentialDetailsDialog(props: SSHCredentialDetailsDialogProps) {

frontend/src/components/SSHPrincipalGrantDetailsDialog.tsx

@@ -6,6 +6,7 @@ import DialogTitle from '@mui/material/DialogTitle'
 import TextField from '@mui/material/TextField'
 import FormDialogContent from './FormDialogContent'
 import { SSHPrincipalGrant } from '../api'
+import { formatEpochTime } from '../time'
 
 type SSHPrincipalGrantDetailsDialogProps = {
 	item: SSHPrincipalGrant | null
@@ -16,7 +17,7 @@ function fmtTime(value: number | undefined): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function fmtLimit(value: number | undefined, suffix: string): string {

frontend/src/components/SSHServerDetailsDialog.tsx

@@ -6,6 +6,7 @@ import DialogTitle from '@mui/material/DialogTitle'
 import TextField from '@mui/material/TextField'
 import FormDialogContent from './FormDialogContent'
 import { SSHServer } from '../api'
+import { formatEpochTime } from '../time'
 
 type SSHServerDetailsDialogProps = {
 	item: SSHServer | null
@@ -17,7 +18,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function formatHostKeyPolicy(value: string | undefined): string {

frontend/src/components/SSHServerGroupDetailsDialog.tsx

@@ -10,6 +10,7 @@ import TextField from '@mui/material/TextField'
 import Typography from '@mui/material/Typography'
 import FormDialogContent from './FormDialogContent'
 import { api, SSHServer, SSHServerGroup } from '../api'
+import { formatEpochTime } from '../time'
 import CompactListItemText from './CompactListItemText'
 import { useEffect, useState } from 'react'
 
@@ -24,7 +25,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function SSHServerGroupDetailsDialog(props: SSHServerGroupDetailsDialogProps) {

frontend/src/components/SplitPanel.tsx

@@ -9,18 +9,18 @@ type SplitPanelProps = {
 }
 
 export default function SplitPanel({ left, right, defaultRatio = 0.3, sx }: SplitPanelProps) {
-	const [splitRatio, setSplitRatio] = useState(defaultRatio)
-	const [splitDragging, setSplitDragging] = useState(false)
+	const [splitRatio, setSplitRatio] = useState<number>(defaultRatio)
+	const [splitDragging, setSplitDragging] = useState<boolean>(false)
 	const containerRef = useRef<HTMLDivElement | null>(null)
 
-	const handlePointerMove = (event: ReactPointerEvent<HTMLDivElement>) => {
-		const container = containerRef.current
+	const handlePointerMove = (event: ReactPointerEvent<HTMLDivElement>): void => {
+		const container: HTMLDivElement | null = containerRef.current
 		if (!splitDragging || !container) return
-		const rect = container.getBoundingClientRect()
+		const rect: DOMRect = container.getBoundingClientRect()
 		setSplitRatio(Math.max(0.1, Math.min(0.9, (event.clientX - rect.left) / rect.width)))
 	}
 
-	const handlePointerUp = () => {
+	const handlePointerUp = (): void => {
 		setSplitDragging(false)
 	}
 
@@ -31,6 +31,10 @@ export default function SplitPanel({ left, right, defaultRatio = 0.3, sx }: Spli
 				{
 					display: 'grid',
 					gridTemplateColumns: `minmax(0, ${splitRatio}fr) 12px minmax(0, ${1 - splitRatio}fr)`,
+					alignItems: 'stretch',
+					height: '100%',
+					minHeight: 0,
+					minWidth: 0,
 					userSelect: splitDragging ? 'none' : 'auto',
 					cursor: splitDragging ? 'col-resize' : 'auto',
 				},
@@ -40,7 +44,21 @@ export default function SplitPanel({ left, right, defaultRatio = 0.3, sx }: Spli
 			onPointerUp={handlePointerUp}
 			onPointerLeave={handlePointerUp}
 		>
-			{left}
+			<Box
+				sx={{
+					display: 'flex',
+					minWidth: 0,
+					minHeight: 0,
+					overflow: 'hidden',
+					'& > *': {
+						flex: '1 1 auto',
+						minWidth: 0,
+						minHeight: 0,
+					},
+				}}
+			>
+				{left}
+			</Box>
 			<Box
 				onPointerDown={() => setSplitDragging(true)}
 				sx={{
@@ -59,7 +77,21 @@ export default function SplitPanel({ left, right, defaultRatio = 0.3, sx }: Spli
 					},
 				}}
 			/>
-			{right}
+			<Box
+				sx={{
+					display: 'flex',
+					minWidth: 0,
+					minHeight: 0,
+					overflow: 'hidden',
+					'& > *': {
+						flex: '1 1 auto',
+						minWidth: 0,
+						minHeight: 0,
+					},
+				}}
+			>
+				{right}
+			</Box>
 		</Box>
 	)
 }

frontend/src/components/UserGroupDetailsDialog.tsx

@@ -14,6 +14,7 @@ import { useEffect, useState } from 'react'
 import CompactListItemText from './CompactListItemText'
 import FormDialogContent from './FormDialogContent'
 import { api, UserGroup, UserGroupMember } from '../api'
+import { formatEpochTime } from '../time'
 
 type UserGroupDetailsDialogProps = {
 	item: UserGroup | null
@@ -25,7 +26,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function yesNo(value: boolean | undefined): string {

frontend/src/pages/AdminApiKeysPage.tsx

@@ -17,6 +17,7 @@ import HeaderActionButton from '../components/HeaderActionButton'
 import { ListRowActionButton, ListRowActions } from '../components/ListRowActions'
 import SectionCard from '../components/SectionCard'
 import { AdminAPIKey, api } from '../api'
+import { formatEpochTime } from '../time'
 import SelectField from '../components/SelectField'
 import CompactListItemText from '../components/CompactListItemText'
 import PageAlert from '../components/PageAlert'
@@ -25,7 +26,7 @@ function formatUnix(value: number) {
 	if (!value || value <= 0) {
 		return 'Never'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function AdminApiKeysPage() {

frontend/src/pages/AdminPKIClientProfilesPage.tsx

@@ -20,6 +20,7 @@ import PKIClientProfileDetailsDialog from '../components/PKIClientProfileDetails
 import PKICADetailsDialog from '../components/PKICADetailsDialog'
 import SectionCard from '../components/SectionCard'
 import { api, PKICA, PKICADetail, PKIClientProfile, PKIClientProfileUpsertPayload, User, UserGroup } from '../api'
+import { formatEpochTime } from '../time'
 import { AppBrand, useBrand } from '../branding'
 import CompactListItemText from '../components/CompactListItemText'
 import PageAlert from '../components/PageAlert'
@@ -28,7 +29,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function parsePermissions(value: string): string[] {

frontend/src/pages/AdminPKIPage.tsx

@@ -26,6 +26,7 @@ import { PKICAEditDialog, PKIIntermediateCADialog, PKIRootCADialog } from '../co
 import { PKICertImportDialog, PKICertIssueDialog, PKICertRevokeDialog } from '../components/PKICertFormDialogs'
 import SectionCard from '../components/SectionCard'
 import { ACMEOrder, ACMEOrderCreatePayload, ACMEProfile, ACMEProfileUpsertPayload, api, PKICA, PKICADetail, PKICert, PKICertDetail, PKICertImportPayload, PKICertIssuePayload, PKIIntermediateCARequest, PKIRootCARequest } from '../api'
+import { formatEpochTime } from '../time'
 import SelectField from '../components/SelectField'
 import CompactListItemText from '../components/CompactListItemText'
 import PageAlert from '../components/PageAlert'
@@ -34,7 +35,7 @@ function fmt(ts: number): string {
 	if (!ts || ts <= 0) {
 		return '-'
 	}
-	return new Date(ts * 1000).toLocaleString()
+	return formatEpochTime(ts)
 }
 
 function fmtPKICertActor(cert: PKICert | PKICertDetail | null | undefined): string {

frontend/src/pages/AdminSSHCredentialsPage.tsx

@@ -22,6 +22,7 @@ import SectionCard from '../components/SectionCard'
 import SSHCredentialDetailsDialog from '../components/SSHCredentialDetailsDialog'
 import PageAlert from '../components/PageAlert'
 import { api, SSHCredential, SSHCredentialUpsertPayload } from '../api'
+import { formatEpochTime } from '../time'
 import CompactListItemText from '../components/CompactListItemText'
 
 type FormState = {
@@ -42,7 +43,7 @@ function emptyForm(): FormState {
 
 function fmt(value: number): string {
 	if (!value || value <= 0) return '-'
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function AdminSSHCredentialsPage() {

frontend/src/pages/AdminSSHPrincipalGrantsPage.tsx

@@ -22,6 +22,7 @@ import SectionCard from '../components/SectionCard'
 import SSHPrincipalGrantDetailsDialog from '../components/SSHPrincipalGrantDetailsDialog'
 import SSHPrincipalGrantFormDialog, { SSHPrincipalGrantFormState } from '../components/SSHPrincipalGrantFormDialog'
 import { api, SSHPrincipalGrant, SSHPrincipalGrantUpsertPayload, User, UserGroup } from '../api'
+import { formatEpochTime } from '../time'
 import Autocomplete from '../components/Autocomplete'
 import SelectField from '../components/SelectField'
 import CompactListItemText from '../components/CompactListItemText'
@@ -36,7 +37,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function toDateTimeInput(value: number): string {

frontend/src/pages/AdminSSHServersPage.tsx

@@ -20,6 +20,7 @@ import SSHServerGroupMembersDialog from '../components/SSHServerGroupMembersDial
 import SSHHostKeysDialog from '../components/SSHHostKeysDialog'
 import PageAlert from '../components/PageAlert'
 import { api, SSHServer, SSHServerGroup, SSHServerGroupUpsertPayload, SSHServerHostKey, SSHServerUpsertPayload } from '../api'
+import { formatEpochTime } from '../time'
 import CompactListItemText from '../components/CompactListItemText'
 
 const emptyForm = (): SSHServerFormState => ({
@@ -41,7 +42,7 @@ const emptyGroupForm = (): SSHServerGroupFormState => ({
 
 function fmt(value: number): string {
 	if (!value || value <= 0) return '-'
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function AdminSSHServersPage() {

frontend/src/pages/AdminSSHSessionsPage.tsx

@@ -18,12 +18,10 @@ import SSHTranscriptDialog from '../components/SSHTranscriptDialog'
 import PageAlert from '../components/PageAlert'
 import PaginationControls from '../components/PaginationControls'
 import { api, SSHAccessProfile, SSHFileTransfer, SSHFileTransferListResponse, SSHServer, SSHSession, SSHSessionListResponse } from '../api'
+import { formatEpochTime } from '../time'
 
 function fmt(value: number): string {
-	if (!value || value <= 0) {
-		return '-'
-	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function sessionTitle(item: SSHSession): string {

frontend/src/pages/AdminSSHSignHistoryPage.tsx

@@ -22,12 +22,13 @@ import SSHPrincipalGrantDetailsDialog from '../components/SSHPrincipalGrantDetai
 import SSHCertificateInspectDialog from '../components/SSHCertificateInspectDialog'
 import UserDetailsDialog from '../components/UserDetailsDialog'
 import { api, SSHPrincipalGrant, SSHUserCA, SSHUserCAIssuance, User } from '../api'
+import { formatEpochTime } from '../time'
 import PageAlert from '../components/PageAlert'
 import Autocomplete from '../components/Autocomplete'
 
 function fmt(value: number): string {
 	if (!value || value <= 0) { return '-' }
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function downloadText(filename: string, text: string) {

frontend/src/pages/AdminSSHUserCAPage.tsx

@@ -25,13 +25,14 @@ import SSHUserCAFormDialog, { SSHUserCAFormState } from '../components/SSHUserCA
 import SSHCertificateInspectDialog from '../components/SSHCertificateInspectDialog'
 import PageAlert from '../components/PageAlert'
 import { api, SSHSignUserKeyResponse, SSHUserCA, SSHUserCACreatePayload, SSHUserCASignPayload, SSHUserCAUpdatePayload } from '../api'
+import { formatEpochTime } from '../time'
 import CompactListItemText from '../components/CompactListItemText'
 
 function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function downloadText(filename: string, text: string) {

frontend/src/pages/AdminServicePrincipalsPage.tsx

@@ -23,17 +23,18 @@ import { ListRowActionButton, ListRowActions } from '../components/ListRowAction
 import SectionCard from '../components/SectionCard'
 import PageAlert from '../components/PageAlert'
 import { api, CertPrincipalBinding, PKICert, PKICertDetail, PrincipalAPIKey, PrincipalProjectRole, Project, ServicePrincipal } from '../api'
+import { formatEpochTime } from '../time'
 import SelectField from '../components/SelectField'
 import CompactListItemText from '../components/CompactListItemText'
 
 function fmt(ts: number): string {
 	if (!ts || ts <= 0) return '-'
-	return new Date(ts * 1000).toLocaleString()
+	return formatEpochTime(ts)
 }
 
 function formatUnix(ts: number): string {
 	if (!ts || ts <= 0) return 'Never'
-	return new Date(ts * 1000).toLocaleString()
+	return formatEpochTime(ts)
 }
 
 function fmtPKICertActor(cert: PKICert | PKICertDetail | null | undefined): string {

frontend/src/pages/AdminUserGroupsPage.tsx

@@ -20,6 +20,7 @@ import SectionCard from '../components/SectionCard'
 import TintedPanel from '../components/TintedPanel'
 import PageAlert from '../components/PageAlert'
 import { api, SubjectPermission, User, UserGroup, UserGroupMember, UserGroupUpsertPayload } from '../api'
+import { formatEpochTime } from '../time'
 import UserGroupFormDialog, { UserGroupFormState } from '../components/UserGroupFormDialog'
 
 const projectCreatePermission: string = 'project.create'
@@ -35,7 +36,7 @@ const groupOptionPermissions: { permission: string, label: string, chip: string
 
 function fmt(value: number): string {
 	if (!value || value <= 0) return '-'
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function defaultUserGroupForm(): UserGroupFormState {

frontend/src/pages/ApiKeysPage.tsx

@@ -23,6 +23,7 @@ import { useEffect, useMemo, useState } from 'react'
 import { ListRowActionButton, ListRowActions } from '../components/ListRowActions'
 import SectionCard from '../components/SectionCard'
 import { api, APIKey } from '../api'
+import { formatEpochTime } from '../time'
 import CompactListItemText from '../components/CompactListItemText'
 import PageAlert from '../components/PageAlert'
 
@@ -30,7 +31,7 @@ function formatUnix(value: number) {
 	if (!value || value <= 0) {
 		return 'Never'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function ApiKeysPage() {

frontend/src/pages/ClientCertificatesPage.tsx

@@ -22,13 +22,14 @@ import PKICertDetailsDialog from '../components/PKICertDetailsDialog'
 import SectionCard from '../components/SectionCard'
 import PageAlert from '../components/PageAlert'
 import { api, PKICADetail, PKIClientIssueResponse, PKIClientIssuance, PKIClientProfile, PKICertDetail } from '../api'
+import { formatEpochTime } from '../time'
 import CompactListItemText from '../components/CompactListItemText'
 
 function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function parseCSV(value: string): string[] {

frontend/src/pages/DashboardPage.tsx

@@ -28,6 +28,7 @@ import {
 } from '../api'
 import SectionCard from '../components/SectionCard'
 import PageAlert from '../components/PageAlert'
+import { formatEpochTime } from '../time'
 
 type LayoutContext = {
 	user: User | null
@@ -58,7 +59,7 @@ function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function DashboardCard(props: DashboardCardProps) {

frontend/src/pages/RepoDockerDetailPage.tsx

@@ -12,6 +12,7 @@ import {
 import { useEffect, useRef, useState } from 'react'
 import { useParams } from 'react-router-dom'
 import { api, DockerManifestDetail, DockerTagInfo, Project, Repo } from '../api'
+import { formatCommitTime } from '../time'
 import ContextToolbar from '../components/ContextToolbar'
 import ProjectPageFrame from '../components/ProjectPageFrame'
 import RepoSubNav from '../components/RepoSubNav'
@@ -431,7 +432,7 @@ export default function RepoDockerDetailPage(props: RepoDockerDetailPageProps) {
 							<Typography variant="body2">OS: {detail.config?.os || 'n/a'}</Typography>
 							<Typography variant="body2">Architecture: {detail.config?.architecture || 'n/a'}</Typography>
 							<Typography variant="body2">
-								Created: {detail.config?.created ? new Date(detail.config.created).toLocaleString() : 'n/a'}
+								Created: {detail.config?.created ? formatCommitTime(detail.config.created) : 'n/a'}
 							</Typography>
 							<Divider sx={{ my: 0.5 }} />
 							<Typography variant="body2">Layers: {detail.layers?.length || 0}</Typography>

frontend/src/pages/RepoGitBranchesPage.tsx

@@ -3,6 +3,7 @@ import Dialog from '../components/ModalDialog'
 import { useEffect, useState } from 'react'
 import { useParams } from 'react-router-dom'
 import { api, BranchInfo, Project, Repo, RepoBranchesInfo } from '../api'
+import { CommitIdentity, splitCommitMessage } from '../components/CommitMeta'
 import ContextToolbar from '../components/ContextToolbar'
 import ProjectPageFrame from '../components/ProjectPageFrame'
 import RepoSubNav from '../components/RepoSubNav'
@@ -263,17 +264,15 @@ export default function RepoGitBranchesPage() {
 											</Typography>
 										) : null}
 										{branch.last_hash ? (
-											<Typography variant="body2" color="text.secondary">
-												{branch.last_hash.slice(0, 8)} • {branch.last_author} • {branch.last_when}
-											</Typography>
+											<CommitIdentity author={branch.last_author} when={branch.last_when} hash={branch.last_hash} />
 										) : (
 											<Typography variant="body2" color="text.secondary">
 												No commits
 											</Typography>
 										)}
 										{branch.last_message ? (
-											<Typography variant="body2" color="text.secondary">
-												{branch.last_message}
+											<Typography variant="body2" color="text.secondary" noWrap>
+												{splitCommitMessage(branch.last_message).subject}
 											</Typography>
 										) : null}
 									</Box>

frontend/src/pages/RepoGitCommitDetailPage.tsx

@@ -1,23 +1,23 @@
-import { Box, Divider, IconButton, List, ListItem, ListItemButton, ListItemText, Paper, Tab, Tabs, Tooltip, Typography } from '@mui/material'
+import { Box, Chip, Divider, IconButton, List, ListItem, ListItemButton, ListItemText, Paper, Tab, Tabs, Tooltip, Typography } from '@mui/material'
 import { useEffect, useState } from 'react'
-import { useParams, useSearchParams } from 'react-router-dom'
+import { Link as RouterLink, useNavigate, useParams, useSearchParams } from 'react-router-dom'
 import { api, Project, Repo, RepoCommitDetail } from '../api'
+import { CommitIdentity, CommitMessage } from '../components/CommitMeta'
 import LazyCodeBlock from '../components/LazyCodeBlock'
 import ContextToolbar from '../components/ContextToolbar'
 import ProjectPageFrame from '../components/ProjectPageFrame'
 import RepoSubNav from '../components/RepoSubNav'
+import SplitPanel from '../components/SplitPanel'
 import AddCircleOutlineIcon from '@mui/icons-material/AddCircleOutline'
 import RemoveCircleOutlineIcon from '@mui/icons-material/RemoveCircleOutline'
 import ChangeCircleOutlinedIcon from '@mui/icons-material/ChangeCircleOutlined'
 import DriveFileRenameOutlineIcon from '@mui/icons-material/DriveFileRenameOutline'
-import ChevronLeftIcon from '@mui/icons-material/ChevronLeft'
-import ChevronRightIcon from '@mui/icons-material/ChevronRight'
-import ChevronLeftOutlinedIcon from '@mui/icons-material/ChevronLeftOutlined'
-import ChevronRightOutlinedIcon from '@mui/icons-material/ChevronRightOutlined'
+import ArrowBackIcon from '@mui/icons-material/ArrowBack'
 
 export default function RepoGitCommitDetailPage() {
 	const { projectId, repoId, hash } = useParams()
 	const [searchParams] = useSearchParams()
+	const navigate = useNavigate()
 	const [detail, setDetail] = useState<RepoCommitDetail | null>(null)
 	const [project, setProject] = useState<Project | null>(null)
 	const [repo, setRepo] = useState<Repo | null>(null)
@@ -26,9 +26,6 @@ export default function RepoGitCommitDetailPage() {
 	const [fileDiff, setFileDiff] = useState<string>('')
 	const [selectedFile, setSelectedFile] = useState<string>('')
 	const [diffView, setDiffView] = useState<'unified' | 'split'>('unified')
-	const [filesOpen, setFilesOpen] = useState(true)
-	const [showLeft, setShowLeft] = useState(true)
-	const [showRight, setShowRight] = useState(true)
 
 	useEffect(() => {
 		if (!repoId || !hash) return
@@ -107,7 +104,7 @@ export default function RepoGitCommitDetailPage() {
 		const lines = raw.replace(/\r\n/g, '\n').split('\n')
 		let leftLine = 0
 		let rightLine = 0
-		const hunkRe = /^@@ -(\d+)(?:,\d+)? \\+(\\d+)(?:,\\d+)? @@/
+		const hunkRe = /^@@ -(\d+)(?:,\d+)? \+(\d+)(?:,\d+)? @@/
 		const rows = lines.map((line) => {
 			const prefix = line.charAt(0)
 			const isAdd = prefix === '+'
@@ -140,146 +137,58 @@ export default function RepoGitCommitDetailPage() {
 				isMeta
 			}
 		})
-		const columns =
-			showLeft && showRight ? 'minmax(0, 1fr) minmax(0, 1fr)' : showLeft ? 'minmax(0, 1fr) 0' : '0 minmax(0, 1fr)'
-		const hiddenCol = {
-			visibility: 'hidden',
-			width: 0,
-			minWidth: 0,
-			maxWidth: 0,
-			padding: 0,
-			border: '0',
-			overflow: 'hidden'
-		}
-		return (
-			<Box sx={{ width: '100%' }}>
+		const monoFont = 'ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace'
+		const renderSide = (side: 'left' | 'right', label: string) => (
+			<Box sx={{ width: '100%', overflowX: 'auto', fontFamily: monoFont, fontSize: 12 }}>
 				<Box
 					sx={{
-						display: 'grid',
-						gridTemplateColumns: columns,
-						gap: 0,
-						fontFamily: 'ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace',
-						fontSize: 12,
-						width: '100%'
+						px: 1,
+						py: 0.5,
+						borderBottom: '1px solid',
+						borderColor: 'divider',
+						fontWeight: 600
 					}}
 				>
-					<Box
-						sx={{
-							px: 1,
-							py: 0.5,
-							borderBottom: '1px solid',
-							borderColor: 'divider',
-							fontWeight: 600,
-							display: 'flex',
-							alignItems: 'center',
-							justifyContent: 'space-between',
-							...(showLeft ? {} : hiddenCol)
-						}}
-					>
-						<Typography variant="caption" sx={{ fontWeight: 700 }}>
-							OLD
-						</Typography>
-						<Box sx={{ display: 'flex', gap: 0.5 }}>
-							{showRight ? (
-								<IconButton size="small" onClick={() => setShowLeft(false)} aria-label="Hide left">
-									<ChevronLeftOutlinedIcon fontSize="small" />
-								</IconButton>
-							) : (
-								<IconButton size="small" onClick={() => setShowRight(true)} aria-label="Show right">
-									<ChevronRightOutlinedIcon fontSize="small" />
-								</IconButton>
-							)}
-						</Box>
-					</Box>
-					<Box
-						sx={{
-							px: 1,
-							py: 0.5,
-							borderBottom: '1px solid',
-							borderColor: 'divider',
-							fontWeight: 600,
-							display: 'flex',
-							alignItems: 'center',
-							justifyContent: 'space-between',
-							...(showRight ? {} : hiddenCol)
-						}}
-					>
-						<Typography variant="caption" sx={{ fontWeight: 700 }}>
-							NEW
-						</Typography>
-						<Box sx={{ display: 'flex', gap: 0.5 }}>
-							{showLeft ? (
-								<IconButton size="small" onClick={() => setShowRight(false)} aria-label="Hide right">
-									<ChevronRightOutlinedIcon fontSize="small" />
-								</IconButton>
-							) : (
-								<IconButton size="small" onClick={() => setShowLeft(true)} aria-label="Show left">
-									<ChevronLeftOutlinedIcon fontSize="small" />
-								</IconButton>
-							)}
-						</Box>
-					</Box>
-					<Box sx={{ overflowX: 'auto', ...(showLeft ? {} : hiddenCol) }}>
-						{rows.map((row, idx) => (
-							<Box
-								key={`left-${idx}`}
-								sx={{
-									px: 1,
-									py: 0.25,
-									whiteSpace: 'pre',
-									backgroundColor: row.isDel ? 'rgba(239,68,68,0.08)' : row.isHunk || row.isMeta ? 'rgba(59,130,246,0.08)' : 'transparent'
-								}}
-							>
-								<Box sx={{ display: 'grid', gridTemplateColumns: '3ch minmax(0, 1fr)', gap: 1 }}>
-									<Box
-										sx={{
-											color: '#9ca3af',
-											textAlign: 'right',
-											userSelect: 'none',
-											backgroundColor: 'rgba(148,163,184,0.08)',
-											borderRight: '1px solid rgba(148,163,184,0.25)',
-											pr: 0.5
-										}}
-									>
-										{row.leftNum || ''}
-									</Box>
-									<Box sx={{ minWidth: 0, whiteSpace: 'pre' }}>{row.left}</Box>
-								</Box>
-							</Box>
-						))}
-					</Box>
-					<Box sx={{ overflowX: 'auto', ...(showRight ? {} : hiddenCol) }}>
-						{rows.map((row, idx) => (
-							<Box
-								key={`right-${idx}`}
-								sx={{
-									px: 1,
-									py: 0.25,
-									whiteSpace: 'pre',
-									backgroundColor: row.isAdd ? 'rgba(16,185,129,0.08)' : row.isHunk || row.isMeta ? 'rgba(59,130,246,0.08)' : 'transparent'
-								}}
-							>
-								<Box sx={{ display: 'grid', gridTemplateColumns: '3ch minmax(0, 1fr)', gap: 1 }}>
-									<Box
-										sx={{
-											color: '#9ca3af',
-											textAlign: 'right',
-											userSelect: 'none',
-											backgroundColor: 'rgba(148,163,184,0.08)',
-											borderRight: '1px solid rgba(148,163,184,0.25)',
-											pr: 0.5
-										}}
-									>
-										{row.rightNum || ''}
-									</Box>
-									<Box sx={{ minWidth: 0, whiteSpace: 'pre' }}>{row.right}</Box>
-								</Box>
-							</Box>
-						))}
-					</Box>
+					<Typography variant="caption" sx={{ fontWeight: 700 }}>
+						{label}
+					</Typography>
 				</Box>
+				{rows.map((row, idx) => {
+					const text = side === 'left' ? row.left : row.right
+					const num = side === 'left' ? row.leftNum : row.rightNum
+					const changed = side === 'left' ? row.isDel : row.isAdd
+					const changedBg = side === 'left' ? 'rgba(239,68,68,0.08)' : 'rgba(16,185,129,0.08)'
+					const backgroundColor = changed ? changedBg : row.isHunk || row.isMeta ? 'rgba(59,130,246,0.08)' : 'transparent'
+					return (
+						<Box key={`${side}-${idx}`} sx={{ px: 1, py: 0.25, whiteSpace: 'pre', backgroundColor }}>
+							<Box sx={{ display: 'grid', gridTemplateColumns: '3ch minmax(0, 1fr)', gap: 1 }}>
+								<Box
+									sx={{
+										color: '#9ca3af',
+										textAlign: 'right',
+										userSelect: 'none',
+										backgroundColor: 'rgba(148,163,184,0.08)',
+										borderRight: '1px solid rgba(148,163,184,0.25)',
+										pr: 0.5
+									}}
+								>
+									{num || ''}
+								</Box>
+								<Box sx={{ minWidth: 0, whiteSpace: 'pre' }}>{text}</Box>
+							</Box>
+						</Box>
+					)
+				})}
 			</Box>
 		)
+		return (
+			<SplitPanel
+				defaultRatio={0.5}
+				sx={{ height: 'auto', minHeight: 0 }}
+				left={renderSide('left', 'OLD')}
+				right={renderSide('right', 'NEW')}
+			/>
+		)
 	}
 
 	const renderStatusIcon = (status: string) => {
@@ -289,11 +198,37 @@ export default function RepoGitCommitDetailPage() {
 		return <ChangeCircleOutlinedIcon fontSize="small" color="info" />
 	}
 
+	const fileCodePath = (filePath: string): string => {
+		var params: URLSearchParams
+		var ref: string
+
+		if (!projectId || !repoId || !filePath) return '#'
+		ref = hash || searchParams.get('ref') || ''
+		params = new URLSearchParams()
+		if (ref) params.set('ref', ref)
+		params.set('path', filePath)
+		return `/projects/${projectId}/repos/${repoId}?${params.toString()}`
+	}
+
+	const commitPath = (commitHash: string): string => {
+		if (!projectId || !repoId || !commitHash) return '#'
+		const ref = searchParams.get('ref') || ''
+		const query = ref ? `?ref=${encodeURIComponent(ref)}` : ''
+		return `/projects/${projectId}/repos/${repoId}/commits/${commitHash}${query}`
+	}
+
+	const codeViewPath = (commitHash: string): string => {
+		if (!projectId || !repoId || !commitHash) return '#'
+		return `/projects/${projectId}/repos/${repoId}?ref=${encodeURIComponent(commitHash)}`
+	}
+
 	return (
 		<ProjectPageFrame
 			projectId={projectId ?? ''}
 			project={project}
 			currentLabel="Commit"
+			fillHeight
+			contentSx={{ display: 'flex', flexDirection: 'column', flex: 1, minHeight: 0, minWidth: 0 }}
 			contextToolbar={
 				<ContextToolbar
 					kind="Repository"
@@ -308,40 +243,25 @@ export default function RepoGitCommitDetailPage() {
 					{loadError}
 				</Typography>
 			) : null}
-			{detail ? (
-				<Paper sx={{ p: 2, mb: 1 }}>
-					<Typography variant="subtitle1">{detail.message}</Typography>
-					<Typography variant="body2" color="text.secondary">
-						{detail.hash}
-					</Typography>
-					<Typography variant="body2">
-						{detail.author} • {detail.email} • {detail.when}
-					</Typography>
-				</Paper>
-			) : null}
-			<Box sx={{ display: 'grid', gridTemplateColumns: `${filesOpen ? '280px' : '44px'} minmax(0, 1fr)`, gap: 1 }}>
-				<Paper sx={{ p: 2 }}>
-					<Box sx={{ display: 'flex', alignItems: 'center', justifyContent: filesOpen ? 'space-between' : 'center', mb: 1 }}>
-						{filesOpen ? <Typography variant="subtitle2">Files</Typography> : null}
-						<IconButton size="small" onClick={() => setFilesOpen((prev) => !prev)}>
-							{filesOpen ? <ChevronLeftIcon fontSize="small" /> : <ChevronRightIcon fontSize="small" />}
-						</IconButton>
+			<SplitPanel defaultRatio={0.28} sx={{ flex: 1, minHeight: 0 }} left={(
+				<Paper sx={{ p: 2, height: '100%', minWidth: 0, minHeight: 0, overflow: 'auto' }}>
+					<Box sx={{ display: 'flex', alignItems: 'center', mb: 1 }}>
+						<Typography variant="subtitle2">Files</Typography>
 					</Box>
-					<List dense>
+					<List dense sx={{ minWidth: '100%', width: 'max-content' }}>
 						{detail?.files.map((file) => (
 							<ListItem key={file.path} divider disablePadding>
-								<ListItemButton onClick={() => handleFileDiff(file.path)}>
+								<ListItemButton onClick={() => handleFileDiff(file.path)} sx={{ minWidth: 'max-content' }}>
 									<ListItemText
+										sx={{ minWidth: 0 }}
 										primary={
-											<Box sx={{ display: 'flex', alignItems: 'center', gap: 1, minWidth: 0 }}>
-												<Tooltip title={filesOpen ? file.status : `${file.status} • ${file.path}`}>
+											<Box sx={{ display: 'flex', alignItems: 'center', gap: 1, minWidth: 'max-content' }}>
+												<Tooltip title={file.status}>
 													<Box sx={{ display: 'flex', alignItems: 'center' }}>{renderStatusIcon(file.status)}</Box>
 												</Tooltip>
-												{filesOpen ? (
-													<Typography variant="body2" sx={{ minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis' }}>
-														{file.path}
-													</Typography>
-												) : null}
+												<Typography variant="body2" sx={{ whiteSpace: 'nowrap' }}>
+													{file.path}
+												</Typography>
 											</Box>
 										}
 									/>
@@ -350,36 +270,109 @@ export default function RepoGitCommitDetailPage() {
 						))}
 					</List>
 				</Paper>
-				<Paper sx={{ p: 2 }}>
-					<Typography variant="subtitle2" gutterBottom>
-						{selectedFile ? `File Diff: ${selectedFile}` : 'Commit Diff'}
-					</Typography>
-					<Tabs
-						value={diffView}
-						onChange={(_, value) => setDiffView(value)}
-						sx={{ mb: 1 }}
-					>
-						<Tab label="Unified" value="unified" />
-						<Tab label="Split" value="split" />
-					</Tabs>
-					{diffView === 'split' ? null : null}
-					{selectedFile ? (
-						fileDiff ? (
-							diffView === 'unified' ? (
-								<LazyCodeBlock code={fileDiff} language="diff" showLineNumbers />
+			)} right={(
+				<Paper sx={{ p: 2, height: '100%', minWidth: 0, minHeight: 0, overflowY: 'auto', overflowX: 'hidden' }}>
+					<Box sx={{ display: 'flex', alignItems: 'center', gap: 1, minWidth: 0 }}>
+						<Tooltip title="Back">
+							<IconButton size="small" onClick={() => navigate(-1)} aria-label="Back">
+								<ArrowBackIcon fontSize="small" />
+							</IconButton>
+						</Tooltip>
+						<CommitIdentity
+							author={detail?.author}
+							email={detail?.email}
+							when={detail?.when}
+							hash={detail?.hash}
+							hashHref={detail?.hash ? codeViewPath(detail.hash) : undefined}
+							hashChip
+							showEmail
+							copy
+							copyHash
+						/>
+					</Box>
+					{detail?.message ? (
+						<Box sx={{ mt: 0.5 }}>
+							<CommitMessage message={detail.message} />
+						</Box>
+					) : null}
+					<Divider sx={{ mt: 0.5, mb: 0.5 }} />
+					<Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: 1 }}>
+						<Tabs value={diffView} onChange={(_, value) => setDiffView(value)}>
+							<Tab label="Unified" value="unified" />
+							<Tab label="Split" value="split" />
+						</Tabs>
+						<Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5, minWidth: 0 }}>
+							{selectedFile ? (
+								<>
+									<Tooltip title="Back to commit diff">
+										<IconButton
+											size="small"
+											onClick={() => {
+												setSelectedFile('')
+												setFileDiff('')
+											}}
+											aria-label="Back to commit diff"
+										>
+											<ArrowBackIcon fontSize="small" />
+										</IconButton>
+									</Tooltip>
+									<Tooltip title={selectedFile}>
+										<Typography
+											variant="subtitle2"
+											color="text.secondary"
+											component={RouterLink}
+											to={fileCodePath(selectedFile)}
+											sx={{ minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', textDecoration: 'none', '&:hover': { textDecoration: 'underline' } }}
+										>
+											{selectedFile}
+										</Typography>
+									</Tooltip>
+								</>
 							) : (
-								renderSplitDiff(fileDiff)
+								<Typography variant="subtitle2" color="text.secondary" sx={{ whiteSpace: 'nowrap' }}>
+									Commit Diff
+								</Typography>
+							)}
+						</Box>
+					</Box>
+					<Box sx={{ mt: 1 }}>
+						{detail?.parents && detail.parents.length > 0 ? (
+							<Box sx={{ display: 'flex', alignItems: 'center', flexWrap: 'wrap', gap: 0.75, mb: 1 }}>
+								<Typography variant="caption" color="text.secondary">
+									{detail.parents.length > 1 ? 'Compared with first parent' : 'Compared with parent'}
+								</Typography>
+								{detail.parents.map((parentHash) => (
+									<Tooltip key={parentHash} title={parentHash}>
+										<Chip
+											component={RouterLink}
+											to={commitPath(parentHash)}
+											label={parentHash.slice(0, 8)}
+											size="small"
+											clickable
+											sx={{ fontFamily: 'monospace' }}
+										/>
+									</Tooltip>
+								))}
+							</Box>
+						) : null}
+						{selectedFile ? (
+							fileDiff ? (
+								diffView === 'unified' ? (
+									<LazyCodeBlock code={fileDiff} language="diff" showLineNumbers />
+								) : (
+									renderSplitDiff(fileDiff)
+								)
+							) : (
+								<Typography>No diff available.</Typography>
 							)
+						) : diff ? (
+							diffView === 'unified' ? <LazyCodeBlock code={diff} language="diff" showLineNumbers /> : renderSplitDiff(diff)
 						) : (
 							<Typography>No diff available.</Typography>
-						)
-					) : diff ? (
-						diffView === 'unified' ? <LazyCodeBlock code={diff} language="diff" showLineNumbers /> : renderSplitDiff(diff)
-					) : (
-						<Typography>No diff available.</Typography>
-					)}
+						)}
+					</Box>
 				</Paper>
-			</Box>
+			)} />
 		</ProjectPageFrame>
 	)
 }

frontend/src/pages/RepoGitCommitsPage.tsx

@@ -2,6 +2,8 @@ import { Box, Button, Divider, List, ListItem, ListItemButton, ListItemText, Men
 import { useEffect, useState } from 'react'
 import { Link, useParams, useSearchParams } from 'react-router-dom'
 import { api, Project, Repo, RepoCommit } from '../api'
+import { CommitIdentity, splitCommitMessage } from '../components/CommitMeta'
+import AccountTreeIcon from '@mui/icons-material/AccountTree'
 import Autocomplete from '../components/Autocomplete'
 import ContextToolbar from '../components/ContextToolbar'
 import ProjectPageFrame from '../components/ProjectPageFrame'
@@ -110,7 +112,7 @@ export default function RepoGitCommitsPage() {
 			<Paper sx={{ p: 2, mb: 1, backgroundColor: 'transparent' }}>
 				<Box sx={{ display: 'flex', gap: 2, flexWrap: 'wrap', alignItems: 'center' }}>
 					<Box sx={{ minWidth: 220, flex: '0 0 auto', display: 'flex', alignItems: 'center', gap: 1 }}>
-						<Typography variant="subtitle2">Branch</Typography>
+						<AccountTreeIcon />
 						<Autocomplete
 							freeSolo
 							options={branches}
@@ -152,7 +154,10 @@ export default function RepoGitCommitsPage() {
 										component={Link}
 										to={`/projects/${projectId}/repos/${repoId}/commits/${commit.hash}?ref=${encodeURIComponent(ref)}`}
 									>
-									<ListItemText primary={commit.message} secondary={`${commit.hash.slice(0, 7)} • ${commit.author} • ${commit.when}`} />
+									<ListItemText
+										primary={splitCommitMessage(commit.message).subject || commit.message}
+										secondary={<CommitIdentity author={commit.author} email={commit.email} when={commit.when} hash={commit.hash} />}
+									/>
 									</ListItemButton>
 								</ListItem>
 						))}
@@ -192,7 +197,10 @@ export default function RepoGitCommitsPage() {
 				<List dense>
 					{compareCommits.map((commit) => (
 						<ListItem key={commit.hash} divider>
-							<ListItemText primary={commit.message} secondary={`${commit.author} • ${commit.when}`} />
+							<ListItemText
+								primary={splitCommitMessage(commit.message).subject || commit.message}
+								secondary={<CommitIdentity author={commit.author} email={commit.email} when={commit.when} />}
+							/>
 						</ListItem>
 					))}
 				</List>

frontend/src/pages/RepoGitDetailPage.tsx

@@ -1,7 +1,8 @@
-import { Box, Button, Divider, IconButton, List, ListItem, ListItemButton, ListItemText, Paper, Popover, Tab, Tabs, TextField, Tooltip, Typography } from '@mui/material'
+import { Box, Button, Chip, Divider, IconButton, List, ListItem, ListItemButton, ListItemText, Paper, Popover, Tab, Tabs, TextField, Tooltip, Typography } from '@mui/material'
 import { lazy, Suspense, useEffect, useRef, useState } from 'react'
-import { useParams, useSearchParams } from 'react-router-dom'
+import { Link as RouterLink, useParams, useSearchParams } from 'react-router-dom'
 import { api, Project, Repo, RepoCommit, RepoTreeEntry } from '../api'
+import { CommitIdentity, CommitMessage, splitCommitMessage } from '../components/CommitMeta'
 import Autocomplete from '../components/Autocomplete'
 import AccountTreeIcon from '@mui/icons-material/AccountTree'
 import CodeIcon from '@mui/icons-material/Code'
@@ -48,6 +49,7 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 	const [imagePreviewRef, setImagePreviewRef] = useState('')
 	const [history, setHistory] = useState<RepoCommit[]>([])
 	const [diff, setDiff] = useState<string>('')
+	const [diffRange, setDiffRange] = useState<{ from: string; to: string }>({ from: '', to: '' })
 	const [previewTab, setPreviewTab] = useState<'content' | 'history' | 'diff'>('content')
 	const [selectedCommit, setSelectedCommit] = useState<RepoCommit | null>(null)
 	const [readmeContent, setReadmeContent] = useState<string>('')
@@ -59,7 +61,11 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 	const initProjectRef = useRef<string | null>(null)
 	const lastTreeKey = useRef<string>('')
 	const refValue = useRef<string>('')
+	const lastQueryFileKey = useRef<string>('')
+	const lastQueryDirKey = useRef<string>('')
 	const urlRef = searchParams.get('ref') || ''
+	const urlFilePath = searchParams.get('path') || ''
+	const urlDirPath = searchParams.get('dir') || ''
 
 	useEffect(() => {
 		if (!repoId) return
@@ -119,6 +125,23 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 		refValue.current = ref
 	}, [ref])
 
+	useEffect(() => {
+		var params: URLSearchParams
+		var href: string
+
+		if (!projectId || !repoId) return
+		if (typeof window === 'undefined') return
+		params = new URLSearchParams()
+		if (ref) params.set('ref', ref)
+		if (selectedFile) {
+			params.set('path', selectedFile)
+		} else if (path) {
+			params.set('dir', path)
+		}
+		href = `/projects/${projectId}/repos/${repoId}${params.toString() ? `?${params.toString()}` : ''}`
+		window.sessionStorage.setItem(`repo-nav:${repoId}:code`, href)
+	}, [projectId, repoId, ref, selectedFile, path])
+
 	useEffect(() => {
 		if (isImageFileSelected && selectedFile) {
 			setImagePreviewRef(ref)
@@ -217,6 +240,75 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 			})
 	}, [repoId, ref, tree, selectedFile, readmePath, readmeKind])
 
+	const openFilePath = async (filePath: string): Promise<void> => {
+		var parentPath: string
+		var blob: { content: string }
+		var list: RepoCommit[]
+		var nextHistory: RepoCommit[]
+
+		if (!repoId || !filePath) return
+		parentPath = filePath.split('/').slice(0, -1).join('/')
+		setPath(parentPath)
+		setPathSegments(parentPath ? parentPath.split('/').filter(Boolean) : [])
+		setSelectedFile(filePath)
+		setPreviewTab('content')
+		setDiff('')
+		setFileQuery('')
+		setIsImageFileSelected(isImageFile(filePath))
+		setImagePreviewRef(ref)
+		if (!isImageFile(filePath)) {
+			try {
+				blob = await api.getRepoBlob(repoId, ref || undefined, filePath)
+				setContent(blob.content)
+			} catch {
+				setContent('')
+			}
+		} else {
+			setContent('')
+		}
+		try {
+			list = await api.listRepoFileHistory(repoId, ref || undefined, filePath)
+			nextHistory = Array.isArray(list) ? list : []
+			setHistory(nextHistory)
+			setSelectedCommit(nextHistory.length ? nextHistory[0] : null)
+		} catch {
+			setHistory([])
+			setSelectedCommit(null)
+		}
+	}
+
+	useEffect(() => {
+		var key: string
+
+		if (!repoId || !urlFilePath) return
+		if (!ref && urlRef) return
+		key = `${repoId}:${ref}:${urlFilePath}`
+		if (lastQueryFileKey.current === key) return
+		lastQueryFileKey.current = key
+		openFilePath(urlFilePath)
+	}, [repoId, ref, urlRef, urlFilePath])
+
+	useEffect(() => {
+		var key: string
+
+		if (!repoId || !urlDirPath || urlFilePath) return
+		if (!ref && urlRef) return
+		key = `${repoId}:${ref}:${urlDirPath}`
+		if (lastQueryDirKey.current === key) return
+		lastQueryDirKey.current = key
+		setPath(urlDirPath)
+		setPathSegments(urlDirPath.split('/').filter(Boolean))
+		setSelectedFile('')
+		setContent('')
+		setFileQuery('')
+		setIsImageFileSelected(false)
+		setImagePreviewRef('')
+		setPreviewTab('content')
+		setDiff('')
+		setHistory([])
+		setSelectedCommit(null)
+	}, [repoId, ref, urlRef, urlDirPath, urlFilePath])
+
 	const handleOpen = async (entry: RepoTreeEntry) => {
 		if (!repoId) return
 		if (entry.type === 'dir') {
@@ -232,31 +324,7 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 			setSelectedCommit(null)
 			return
 		}
-		setSelectedFile(entry.path)
-		setPreviewTab('content')
-		setDiff('')
-		setIsImageFileSelected(isImageFile(entry.path))
-		setImagePreviewRef(ref)
-		if (!isImageFile(entry.path)) {
-			try {
-				// get the content of the select file and  set it to the content view
-				const blob = await api.getRepoBlob(repoId, ref || undefined, entry.path)
-				setContent(blob.content)
-			} catch {
-				setContent('')
-			}
-		} else {
-			setContent('')
-		}
-		try {
-			const list = await api.listRepoFileHistory(repoId, ref || undefined, entry.path)
-			const nextHistory = Array.isArray(list) ? list : []
-			setHistory(nextHistory)
-			setSelectedCommit(nextHistory.length ? nextHistory[0] : null)
-		} catch {
-			setHistory([])
-			setSelectedCommit(null)
-		}
+		await openFilePath(entry.path)
 	}
 
 	const handleBack = () => {
@@ -405,11 +473,29 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 		}
 	}
 
-	const handleDiff = async () => {
+	// Fetch the diff for the file as it changed in the selected commit (the most
+	// recent commit touching the file by default, or whatever was picked in the
+	// History tab). Refetches whenever the selected commit changes while the Diff
+	// tab is open. Using the branch ref here would diff only the branch tip, which
+	// is empty for any file the tip commit did not touch.
+	useEffect(() => {
+		if (previewTab !== 'diff') return
 		if (!repoId || !selectedFile) return
-		const result = await api.getRepoFileDiff(repoId, ref || undefined, selectedFile)
-		setDiff(result.diff || '')
-	}
+		let cancelled = false
+		const diffRef = selectedCommit?.hash || ref
+		api.getRepoFileDiff(repoId, diffRef || undefined, selectedFile)
+			.then((result) => {
+				if (cancelled) return
+				setDiff(result.diff || '')
+				setDiffRange({ from: result.from || '', to: result.to || '' })
+			})
+			.catch(() => {
+				if (cancelled) return
+				setDiff('')
+				setDiffRange({ from: '', to: '' })
+			})
+		return () => { cancelled = true }
+	}, [previewTab, repoId, selectedFile, selectedCommit, ref])
 
 	const copyText = async (text: string) => {
 		let ok = false
@@ -512,6 +598,14 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 		return `/api/repos/${repoId}/blob/raw?${params.toString()}`
 	}
 
+	const commitDetailPath = (hash: string): string => {
+		var queryRef: string
+
+		if (!projectId || !repoId || !hash) return '#'
+		queryRef = imagePreviewRef || ref
+		return `/projects/${projectId}/repos/${repoId}/commits/${hash}${queryRef ? `?ref=${encodeURIComponent(queryRef)}` : ''}`
+	}
+
 	const resolveReadmeAsset = (src: string) => {
 		if (!src) return ''
 		if (src.startsWith('http://') || src.startsWith('https://') || src.startsWith('data:')) return src
@@ -612,7 +706,7 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 	}
 
 	const renderPathBreadcrumb = () => {
-		return (<Box sx={{ display: 'flex', alignItems: 'center', flexWrap: 'wrap', gap: 0 }}>
+		return (<Box sx={{ display: 'flex', alignItems: 'center', flexWrap: 'nowrap', gap: 0  }}>
 			<IconButton
 				size="small"
 				onClick={() => handleBreadcrumb('')}
@@ -661,6 +755,8 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 			projectId={projectId ?? ''}
 			project={project}
 			currentLabel={repo?.name || 'Repository'}
+			fillHeight
+			contentSx={{ display: 'flex', flexDirection: 'column', flex: 1, minHeight: 0, minWidth: 0 }}
 			contextToolbar={
 				<ContextToolbar
 					kind="Repository"
@@ -676,11 +772,10 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 				</Typography>
 			) : null}
 
-
-			<SplitPanel defaultRatio={0.25} left={(
-				<TintedPanel>
-					<Box sx={{ display: 'flex', alignItems: 'stretch', gap: 1, mb: 1 }}>
-						<Paper sx={{ p: 1, display: 'flex', alignItems: 'center', gap: 1, minWidth: 240, backgroundColor: 'transparent' }}>
+			<SplitPanel defaultRatio={0.30} sx={{ flex: 1, minHeight: 0 }} left={(
+				<TintedPanel sx={{ minWidth: 0, minHeight: 0, height: '100%', overflow: 'auto' }}>
+					<Box sx={{ display: 'flex', alignItems: 'stretch' }}>
+						<Paper sx={{ p: 1, display: 'flex', alignItems: 'center', gap: 1, minWidth: 0, width: '100%', backgroundColor: 'transparent' }}>
 							<AccountTreeIcon />
 							{branches.length ? (
 								<Autocomplete
@@ -700,11 +795,14 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 									sx={{ minWidth: 180 }}
 								/>
 							) : null}
-							{renderClonePopover()}
+							<Box sx={{ marginLeft: 'auto' }}>
+								{renderClonePopover()}
+							</Box>
 						</Paper>
 					</Box>
 
 					<PageAlert severity="warning" message={treeError} onClose={() => setTreeError(null)} sx={{ mb: 1 }} />
+
 					<List dense>
 						<Box sx={{ px: 1, pb: 1 }}>
 							<TextField
@@ -759,27 +857,23 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 					</List>
 				</TintedPanel>
 			)} right={(
-				<TintedPanel>
+				<TintedPanel sx={{ height: '100%', minHeight: 0, overflowY: 'auto', overflowX: 'hidden' }}>
 					<Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', mb: 1 }}>
 						{renderPathBreadcrumb()}
 					</Box>
 					{selectedFile ? (
 						<Box sx={{ mt: 0 }}>
-							<Box sx={{ display: 'flex', alignItems: 'center', gap: 2 }}>
-								<Typography variant="body2" color="text.secondary">
-									{selectedCommit?.author || 'Unknown'}
-								</Typography>
-								<Typography variant="body2" color="text.secondary" sx={{ flex: 1, minWidth: 0 }}>
-									{selectedCommit?.message || 'No commit message'}
-								</Typography>
-								<Tooltip title={selectedCommit?.hash || ''}>
-									<Typography variant="body2" color="text.secondary" sx={{ marginLeft: 'auto', whiteSpace: 'nowrap' }}>
-										{selectedCommit?.hash ? selectedCommit.hash.slice(0, 8) : ''}
-									</Typography>
-								</Tooltip>
-								<Typography variant="body2" color="text.secondary" sx={{ whiteSpace: 'nowrap' }}>
-									{selectedCommit?.when || ''}
-								</Typography>
+							<CommitIdentity
+								author={selectedCommit?.author}
+								email={selectedCommit?.email}
+								when={selectedCommit?.when}
+								hash={selectedCommit?.hash}
+								hashHref={selectedCommit?.hash ? commitDetailPath(selectedCommit.hash) : undefined}
+								hashChip
+								copyHash
+							/>
+							<Box sx={{ mt: 0.5 }}>
+								<CommitMessage message={selectedCommit?.message || ''} inline />
 							</Box>
 							<Divider sx={{ mt: 0.5, mb: 0.5 }} />
 							<Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
@@ -788,7 +882,6 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 									onChange={(_, value) => {
 										setPreviewTab(value)
 										if (value === 'history' && history.length === 0) handleHistory()
-										if (value === 'diff' && diff === '') handleDiff()
 									}}
 								>
 									<Tab label="Code" value="content" />
@@ -859,7 +952,7 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 							</Box>
 							{previewTab === 'content' ? (
 								isImageFileSelected ? (
-									<Paper variant="outlined" sx={{ p: 1, mt: 1, backgroundColor: 'transparent' }}>
+									<Paper variant="outlined" sx={{ p: 1, mt: 1, minWidth: 0, maxWidth: '100%', backgroundColor: 'transparent' }}>
 										<Box
 											component="img"
 											src={buildBlobRawUrl(selectedFile, imagePreviewRef || ref)}
@@ -868,7 +961,7 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 										/>
 									</Paper>
 								) : (
-									<Paper variant="outlined" sx={{ p: 1, pr: 0.5, mt: 1, backgroundColor: 'transparent' }}>
+									<Paper variant="outlined" sx={{ p: 1, pr: 0.5, mt: 1, minWidth: 0, maxWidth: '100%', backgroundColor: 'transparent' }}>
 										<LazyCodeBlock code={content} language={detectLanguage(selectedFile)} showLineNumbers />
 									</Paper>
 								)
@@ -881,18 +974,15 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 												<ListItem key={commit.hash} divider disablePadding>
 													<ListItemButton onClick={() => handleHistorySelect(commit.hash)}>
 														<ListItemText
-															primary={commit.message}
+															primary={splitCommitMessage(commit.message).subject || commit.message}
 															secondary={
-																<Box component="span" sx={{ display: 'flex', alignItems: 'center', gap: 0.5, flexWrap: 'wrap' }} >
-																	<Tooltip title={commit.hash}>
-																		<Typography variant="body2" color="text.secondary" component="span">
-																			{commit.hash.slice(0, 8)}
-																		</Typography>
-																	</Tooltip>
-																	<Typography variant="body2" color="text.secondary" component="span">
-																		• {commit.author} • {commit.when}
-																	</Typography>
-																</Box>
+																<CommitIdentity
+																	author={commit.author}
+																	email={commit.email}
+																	when={commit.when}
+																	hash={commit.hash}
+																	hashHref={commitDetailPath(commit.hash)}
+																/>
 															}
 														/>
 													</ListItemButton>
@@ -908,9 +998,32 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 							) : null}
 							{previewTab === 'diff' ? (
 								diff ? (
-									<Paper variant="outlined" sx={{ p: 1, pr: 0.5, mt: 1, backgroundColor: 'transparent' }}>
-										<LazyCodeBlock code={diff} language="diff" />
-									</Paper>
+									<>
+										{diffRange.from ? (
+											<Box sx={{ display: 'flex', alignItems: 'center', gap: 0.75, mt: 1 }}>
+												<Typography variant="caption" color="text.secondary">
+													Compared with parent
+												</Typography>
+												<Tooltip title={diffRange.from}>
+													<Chip
+														component={RouterLink}
+														to={commitDetailPath(diffRange.from)}
+														label={diffRange.from.slice(0, 8)}
+														size="small"
+														clickable
+														sx={{ fontFamily: 'monospace' }}
+													/>
+												</Tooltip>
+											</Box>
+										) : (
+											<Typography variant="caption" color="text.secondary" sx={{ display: 'block', mt: 1 }}>
+												Initial version (no parent to compare against)
+											</Typography>
+										)}
+										<Paper variant="outlined" sx={{ p: 1, pr: 0.5, mt: 0.5, minWidth: 0, maxWidth: '100%', backgroundColor: 'transparent' }}>
+											<LazyCodeBlock code={diff} language="diff" />
+										</Paper>
+									</>
 								) : (
 									<Typography variant="body2" color="text.secondary" sx={{ mt: 1 }}>
 										No diff available.
@@ -920,7 +1033,7 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 						</Box>
 					) : readmeContent ? (
 						readmeKind === 'markdown' ? (
-							<Paper variant="outlined" sx={{ p: 1, mt: 1, backgroundColor: 'transparent' }}>
+							<Paper variant="outlined" sx={{ p: 1, mt: 1, minWidth: 0, maxWidth: '100%', backgroundColor: 'transparent' }}>
 								<Box>
 									<Suspense fallback={<Typography variant="body2" color="text.secondary">Loading README...</Typography>}>
 										<RepoMarkdown
@@ -932,7 +1045,7 @@ export default function RepoGitDetailPage(props: RepoGitDetailPageProps) {
 								</Box>
 							</Paper>
 						) : (
-							<Paper variant="outlined" sx={{ p: 1, mt: 1, backgroundColor: 'transparent' }}>
+							<Paper variant="outlined" sx={{ p: 1, mt: 1, minWidth: 0, maxWidth: '100%', backgroundColor: 'transparent' }}>
 								<LazyCodeBlock code={readmeContent} language="text" showLineNumbers />
 							</Paper>
 						)

frontend/src/pages/RepoRpmDetailPage.tsx

@@ -25,6 +25,7 @@ import { useParams, useSearchParams } from 'react-router-dom'
 import PageAlert from '../components/PageAlert'
 import SplitPanel from '../components/SplitPanel'
 import { api, Project, Repo, RpmMirrorRun, RpmPackageDetail, RpmPackageSummary, RpmSubdirCreatePayload, RpmSubdirUpdatePayload, RpmTreeEntry } from '../api'
+import { formatEpochTime } from '../time'
 import DeleteOutlineIcon from '@mui/icons-material/DeleteOutline'
 import DriveFileRenameOutlineIcon from '@mui/icons-material/DriveFileRenameOutline'
 import FolderIcon from '@mui/icons-material/Folder'
@@ -1097,7 +1098,7 @@ export default function RepoRpmDetailPage(props: RepoRpmDetailPageProps) {
 										)}
 									</Typography>
 									<Typography variant="body2">
-										Build Time: {rpmDetail.build_time ? new Date(rpmDetail.build_time * 1000).toLocaleString() : 'n/a'}
+										Build Time: {rpmDetail.build_time ? formatEpochTime(rpmDetail.build_time) : 'n/a'}
 									</Typography>
 									<Typography variant="body2">Size: {rpmDetail.size ? `${rpmDetail.size} bytes` : 'n/a'}</Typography>
 									{Array.isArray(rpmDetail.requires) && rpmDetail.requires.length ? (
@@ -1131,7 +1132,7 @@ export default function RepoRpmDetailPage(props: RepoRpmDetailPageProps) {
 											{rpmDetail.changelogs.map((item, index) => (
 												<ListItem key={`${item.date}-${index}`} sx={{ display: 'block' }}>
 													<Typography variant="body2" color="text.secondary">
-														{item.date ? new Date(item.date * 1000).toLocaleString() : 'n/a'}
+														{item.date ? formatEpochTime(item.date) : 'n/a'}
 														{item.author ? ` · ${item.author}` : ''}
 													</Typography>
 													<Typography variant="body2" sx={{ whiteSpace: 'pre-wrap' }}>

frontend/src/pages/SSHCertificatesPage.tsx

@@ -22,13 +22,14 @@ import SSHCertificateIssuedDialog from '../components/SSHCertificateIssuedDialog
 import SSHUserCADetailsDialog from '../components/SSHUserCADetailsDialog'
 import PageAlert from '../components/PageAlert'
 import { api, SSHPrincipalGrant, SSHSignUserKeyResponse, SSHUserCA, SSHUserCAIssuance, SSHUserCASelfSignPayload } from '../api'
+import { formatEpochTime } from '../time'
 import SelectField from '../components/SelectField'
 
 function fmt(value: number): string {
 	if (!value || value <= 0) {
 		return '-'
 	}
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 async function copyText(text: string): Promise<boolean> {

frontend/src/pages/SSHCredentialsPage.tsx

@@ -22,6 +22,7 @@ import SectionCard from '../components/SectionCard'
 import SSHCredentialDetailsDialog from '../components/SSHCredentialDetailsDialog'
 import PageAlert from '../components/PageAlert'
 import { api, SSHCredential, SSHCredentialUpsertPayload } from '../api'
+import { formatEpochTime } from '../time'
 import CompactListItemText from '../components/CompactListItemText'
 
 type FormState = {
@@ -42,7 +43,7 @@ function emptyForm(): FormState {
 
 function fmt(value: number): string {
 	if (!value || value <= 0) return '-'
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 export default function SSHCredentialsPage() {

frontend/src/pages/SSHSessionPage.tsx

@@ -39,6 +39,7 @@ import PageAlert from '../components/PageAlert'
 import Autocomplete from '../components/Autocomplete'
 import PaginationControls from '../components/PaginationControls'
 import { api, SSHAccessProfile, SSHFileTransfer, SSHFileTransferListResponse, SSHServer, SSHSession, SSHSessionConnectResponse, SSHSessionListResponse } from '../api'
+import { formatEpochTime } from '../time'
 
 type SSHSessionStreamMessage = {
 	session_id?: string
@@ -138,8 +139,7 @@ function buildInitialTerminalInfo(password?: string, otpCode?: string): Terminal
 }
 
 function formatTimestamp(value: number): string {
-	if (!value) { return '-' }
-	return new Date(value * 1000).toLocaleString()
+	return formatEpochTime(value)
 }
 
 function formatTransferBytes(value: number): string {

frontend/src/time.ts

@@ -0,0 +1,40 @@
+// Commit timestamps arrive from the backend as UTC strings formatted like
+// "2026-06-22 03:12:11Z". formatCommitTime converts such a value to the
+// viewer's local time with the timezone offset shown, e.g.
+// "2026-06-22 11:12:11 +08:00". The original string is returned unchanged if it
+// cannot be parsed.
+export function formatCommitTime(value: string | null | undefined): string {
+	if (!value) return ''
+	const trimmed = value.trim()
+	if (!trimmed) return ''
+	// The backend uses a space between date and time; ISO 8601 needs a 'T'.
+	const date = new Date(trimmed.replace(' ', 'T'))
+	if (Number.isNaN(date.getTime())) return value
+	return formatLocalWithOffset(date)
+}
+
+// formatEpochTime converts a Unix timestamp in seconds to the same local time
+// with offset format as formatCommitTime, returning '-' for missing values.
+export function formatEpochTime(seconds: number | null | undefined): string {
+	if (!seconds || seconds <= 0) return '-'
+	const date = new Date(seconds * 1000)
+	if (Number.isNaN(date.getTime())) return '-'
+	return formatLocalWithOffset(date)
+}
+
+function formatLocalWithOffset(date: Date): string {
+	const pad = (n: number) => String(n).padStart(2, '0')
+	const year = date.getFullYear()
+	const month = pad(date.getMonth() + 1)
+	const day = pad(date.getDate())
+	const hours = pad(date.getHours())
+	const minutes = pad(date.getMinutes())
+	const seconds = pad(date.getSeconds())
+	// getTimezoneOffset() is minutes that local is behind UTC, so negate it.
+	const offsetMinutes = -date.getTimezoneOffset()
+	const sign = offsetMinutes >= 0 ? '+' : '-'
+	const absMinutes = Math.abs(offsetMinutes)
+	const offsetHours = pad(Math.floor(absMinutes / 60))
+	const offsetMins = pad(absMinutes % 60)
+	return `${year}-${month}-${day} ${hours}:${minutes}:${seconds} ${sign}${offsetHours}:${offsetMins}`
+}