merge: land desktop tab bar height tuning

Bring the focused titlebar-density fix from the Codex worktree into local main. The patch only adjusts the desktop tab strip height baseline and its regression test, leaving existing local workspace edits untouched.

Constraint: Local main has unrelated uncommitted desktop settings/workspace edits that must be preserved
Rejected: Broad staging before merge | would mix unrelated local work into this landing
Confidence: high
Scope-risk: narrow
Directive: Keep this merge limited to the tab bar height patch; do not treat unrelated dirty files as part of this change
Tested: cd desktop && bunx vitest run src/components/layout/TabBar.test.tsx
Tested: bun run check:desktop
Not-tested: Push or PR creation; user asked for local main merge only

desktop/src/components/layout/TabBar.test.tsx

@@ -256,6 +256,34 @@ describe('TabBar', () => {
     expect(screen.getByTestId('tab-bar-drag-gutter')).toHaveAttribute('data-tauri-drag-region')
   })
 
+  it('keeps the desktop tab strip at a roomier titlebar height', async () => {
+    const { TabBar } = await import('./TabBar')
+    const { useTabStore } = await import('../../stores/tabStore')
+    const { useChatStore } = await import('../../stores/chatStore')
+
+    useTabStore.setState({
+      tabs: [
+        { sessionId: 'tab-1', title: 'Untitled Session', type: 'session', status: 'idle' },
+      ],
+      activeTabId: 'tab-1',
+    })
+    useChatStore.setState({
+      sessions: {},
+      disconnectSession: vi.fn(),
+    } as Partial<ReturnType<typeof useChatStore.getState>>)
+
+    await act(async () => {
+      render(<TabBar />)
+    })
+
+    const tabBar = screen.getByTestId('tab-bar')
+    const tab = screen.getByText('Untitled Session').closest('.tab-bar-hit-area')
+
+    expect(tabBar).toHaveClass('min-h-11')
+    expect(tab).toHaveClass('min-h-11')
+    expect(screen.getByTestId('tab-bar-drag-gutter')).toHaveClass('min-h-11')
+  })
+
   it('passes the active session workdir into the open-project control', async () => {
     const { TabBar } = await import('./TabBar')
     const { useTabStore } = await import('../../stores/tabStore')

desktop/src/components/layout/TabBar.tsx

@@ -294,11 +294,11 @@ export function TabBar() {
   return (
     <div
       data-testid="tab-bar"
-      className="flex items-stretch bg-[var(--color-surface-container)] min-h-[37px] select-none border-b border-[var(--color-border)]"
+      className="flex min-h-11 items-stretch bg-[var(--color-surface-container)] select-none border-b border-[var(--color-border)]"
     >
 
       {canScrollLeft && (
-        <button onClick={() => scroll('left')} className="flex-shrink-0 w-7 h-[37px] flex items-center justify-center text-[var(--color-text-tertiary)] hover:text-[var(--color-text-primary)] hover:bg-[var(--color-surface-hover)]">
+        <button onClick={() => scroll('left')} className="flex h-11 w-7 flex-shrink-0 items-center justify-center text-[var(--color-text-tertiary)] hover:bg-[var(--color-surface-hover)] hover:text-[var(--color-text-primary)]">
           <span className="material-symbols-outlined text-[16px]">chevron_left</span>
         </button>
       )}
@@ -357,12 +357,12 @@ export function TabBar() {
           data-testid="tab-bar-drag-gutter"
           data-tauri-drag-region
           aria-hidden="true"
-          className={`flex-shrink-0 min-h-[37px] ${showWindowControls ? 'w-3' : 'w-4'}`}
+          className={`min-h-11 flex-shrink-0 ${showWindowControls ? 'w-3' : 'w-4'}`}
         />
       )}
 
       {canScrollRight && (
-        <button onClick={() => scroll('right')} className="flex-shrink-0 w-7 h-[37px] flex items-center justify-center text-[var(--color-text-tertiary)] hover:text-[var(--color-text-primary)] hover:bg-[var(--color-surface-hover)]">
+        <button onClick={() => scroll('right')} className="flex h-11 w-7 flex-shrink-0 items-center justify-center text-[var(--color-text-tertiary)] hover:bg-[var(--color-surface-hover)] hover:text-[var(--color-text-primary)]">
           <span className="material-symbols-outlined text-[16px]">chevron_right</span>
         </button>
       )}
@@ -466,7 +466,7 @@ const TabItem = forwardRef<HTMLDivElement, {
       onMouseDown={onMouseDown}
       onContextMenu={onContextMenu}
       className={`
-        tab-bar-hit-area group flex-shrink-0 flex items-center gap-1.5 px-3 min-h-[37px] relative
+        tab-bar-hit-area group relative flex min-h-11 flex-shrink-0 items-center gap-1.5 px-3
         ${isDragging ? 'z-20 cursor-grabbing' : 'cursor-grab'}
         transition-[background-color,box-shadow,opacity,transform] duration-150 ease-out
         ${isActive