fix(source-control): compact detached head identity

src/renderer/src/components/DetachedHeadBadge.tsx

@@ -27,6 +27,7 @@ export function DetachedHeadBadge({
       <TooltipTrigger asChild>
         <Badge
           variant="outline"
+          aria-label={display.tooltip}
           className={cn(
             'h-[18px] shrink-0 gap-1 rounded px-1.5 text-[10px] font-medium leading-none',
             'border-[color:color-mix(in_srgb,var(--git-decoration-modified)_30%,transparent)] bg-[color:color-mix(in_srgb,var(--git-decoration-modified)_8%,transparent)] text-[color:var(--git-decoration-modified)]',
@@ -34,7 +35,7 @@ export function DetachedHeadBadge({
           )}
         >
           <GitCommitHorizontal className="size-2.5" />
-          {visibleLabel}
+          <span className="min-w-0 truncate">{visibleLabel}</span>
         </Badge>
       </TooltipTrigger>
       <TooltipContent side={side} sideOffset={8}>

src/renderer/src/components/right-sidebar/SourceControl.tsx

@@ -45,7 +45,6 @@ import { WORKSPACE_FILE_PATH_MIME } from '@/lib/workspace-file-drag'
 import { isFolderRepo } from '../../../../shared/repo-kind'
 import { Tooltip, TooltipTrigger, TooltipContent, TooltipProvider } from '@/components/ui/tooltip'
 import { Button } from '@/components/ui/button'
-import { DetachedHeadBadge } from '@/components/DetachedHeadBadge'
 import {
   DropdownMenu,
   DropdownMenuContent,
@@ -808,7 +807,6 @@ function SourceControlInner(): React.JSX.Element {
   const activeRepoConnectionId = activeRepo?.connectionId ?? null
   const activeRepoExecutionHostId = activeRepo?.executionHostId ?? null
   const gitIdentityDisplay = activeWorktree ? getWorktreeGitIdentityDisplay(activeWorktree) : null
-  const detachedHeadDisplay = gitIdentityDisplay?.kind === 'detached' ? gitIdentityDisplay : null
   const branchName = gitIdentityDisplay?.kind === 'branch' ? gitIdentityDisplay.branchName : ''
   const entries = useAppStore((s) =>
     activeWorktreeId
@@ -5446,7 +5444,7 @@ function SourceControlInner(): React.JSX.Element {
     <>
       <div ref={setSourceControlRoot} className="relative flex h-full flex-col overflow-hidden">
         <SourceControlHeaderToolbar
-          branchName={branchName}
+          gitIdentityDisplay={gitIdentityDisplay}
           filterQuery={filterQuery}
           filterExpanded={filterExpanded}
           onFilterQueryChange={setFilterQuery}
@@ -5469,12 +5467,6 @@ function SourceControlInner(): React.JSX.Element {
           manualReviewUrl={manualReviewUrl}
         />
 
-        {detachedHeadDisplay && (
-          <div className="border-b border-border px-3 py-2">
-            <DetachedHeadBadge display={detachedHeadDisplay} side="bottom" />
-          </div>
-        )}
-
         {/* Why: hidden when count is 0 — notes are created from the diff view, so an empty Notes shelf here is pure chrome. */}
         {activeWorktreeId && worktreePath && diffCommentCount > 0 && (
           <div className="border-b border-border">

src/renderer/src/components/right-sidebar/source-control-header-toolbar.test.tsx

@@ -1,6 +1,7 @@
 import { renderToStaticMarkup } from 'react-dom/server'
 import type { ReactNode } from 'react'
 import { describe, expect, it, vi } from 'vitest'
+import type { WorktreeGitIdentityDisplay } from '@/lib/worktree-git-identity-display'
 import { SourceControlHeaderToolbar } from './source-control-header-toolbar'
 
 vi.mock('@/components/ui/tooltip', () => ({
@@ -18,10 +19,15 @@ vi.mock('./source-control-branch-context-row', () => ({
   SourceControlBranchContextRow: () => null
 }))
 
-function renderToolbar(branchName = 'brennanb2025/source-control-branch-name'): string {
+function renderToolbar(
+  gitIdentityDisplay: WorktreeGitIdentityDisplay | null = {
+    kind: 'branch',
+    branchName: 'brennanb2025/source-control-branch-name'
+  }
+): string {
   return renderToStaticMarkup(
     <SourceControlHeaderToolbar
-      branchName={branchName}
+      gitIdentityDisplay={gitIdentityDisplay}
       filterQuery=""
       filterExpanded={false}
       onFilterQueryChange={vi.fn()}
@@ -56,10 +62,30 @@ describe('SourceControlHeaderToolbar', () => {
     expect(markup).toContain('min-w-0 truncate')
   })
 
-  it('does not announce a branch while HEAD is detached', () => {
-    const markup = renderToolbar('')
+  it('renders detached HEAD in the same identity slot', () => {
+    const markup = renderToolbar({
+      kind: 'detached',
+      shortHead: '8cec248',
+      sidebarLabel: 'Detached HEAD @ 8cec248',
+      sourceControlLabel: 'Detached HEAD · 8cec248',
+      tooltip: 'Detached HEAD at 8cec248. You are viewing a commit, not a branch.'
+    })
+    const identityIndex = markup.indexOf('Detached HEAD · 8cec248')
+    const filterIndex = markup.indexOf('data-testid="source-control-filter-toggle"')
 
     expect(markup).not.toContain('aria-label="Current branch:')
-    expect(markup).not.toContain('lucide-git-branch')
+    expect(identityIndex).toBeGreaterThan(-1)
+    expect(filterIndex).toBeGreaterThan(identityIndex)
+    expect(markup).toContain(
+      'aria-label="Detached HEAD at 8cec248. You are viewing a commit, not a branch."'
+    )
+    expect(markup).toContain('lucide-git-commit-horizontal')
+  })
+
+  it('keeps the identity slot empty until git identity is known', () => {
+    const markup = renderToolbar(null)
+
+    expect(markup).not.toContain('aria-label="Current branch:')
+    expect(markup).not.toContain('Detached HEAD')
   })
 })

src/renderer/src/components/right-sidebar/source-control-header-toolbar.tsx

@@ -10,6 +10,8 @@ import { Button } from '@/components/ui/button'
 import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 import { cn } from '@/lib/utils'
 import { translate } from '@/i18n/i18n'
+import { DetachedHeadBadge } from '@/components/DetachedHeadBadge'
+import type { WorktreeGitIdentityDisplay } from '@/lib/worktree-git-identity-display'
 import {
   shouldShowSourceControlBranchContextRow,
   SourceControlBranchContextRow
@@ -17,7 +19,7 @@ import {
 import { SourceControlHeaderOverflowMenu } from './source-control-header-overflow-menu'
 
 type SourceControlHeaderToolbarProps = {
-  branchName: string
+  gitIdentityDisplay: WorktreeGitIdentityDisplay | null
   filterQuery: string
   filterExpanded: boolean
   onFilterQueryChange: (value: string) => void
@@ -40,7 +42,20 @@ type SourceControlHeaderToolbarProps = {
   manualReviewUrl?: string | null
 }
 
-function SourceControlBranchHeaderLabel({ branchName }: { branchName: string }): React.JSX.Element {
+function SourceControlGitIdentityLabel({
+  display
+}: {
+  display: WorktreeGitIdentityDisplay
+}): React.JSX.Element {
+  if (display.kind === 'detached') {
+    return (
+      <span className="flex min-w-0 flex-1 items-center">
+        <DetachedHeadBadge display={display} side="bottom" className="min-w-0 max-w-full shrink" />
+      </span>
+    )
+  }
+
+  const branchName = display.branchName
   const label = translate(
     'auto.components.right.sidebar.SourceControl.a4e93c21d7',
     'Current branch: {{value0}}',
@@ -121,7 +136,7 @@ function renderOverflowMenu(
 }
 
 export function SourceControlHeaderToolbar({
-  branchName,
+  gitIdentityDisplay,
   filterQuery,
   filterExpanded,
   onFilterQueryChange,
@@ -192,8 +207,8 @@ export function SourceControlHeaderToolbar({
       >
         {showCollapsedToolbar ? (
           <>
-            {branchName ? (
-              <SourceControlBranchHeaderLabel branchName={branchName} />
+            {gitIdentityDisplay ? (
+              <SourceControlGitIdentityLabel display={gitIdentityDisplay} />
             ) : (
               <span className="min-w-0 flex-1" aria-hidden="true" />
             )}