fix: polish cross-platform commit shortcut

TASKS.md

@@ -1332,6 +1332,10 @@ Detailed comparison and sequencing: [`docs/git-client-1.0-audit.md`](./docs/git-
     surface-local editing/navigation keys remain fixed and are fully listed in
     Settings → Keyboard plus the user guide. They are keyboard access, not
     hidden commands requiring a second binding registry.
+  - ☑ Windows/Linux commit shortcut polish: the Local Changes commit action
+    renders `Ctrl` + return as a compact two-key chord while macOS retains its
+    native `⌘↵` glyph treatment; Linux keeps its own platform identity while
+    sharing Ctrl-style shortcuts (`CommitBar` + `detectPlatform`, 2026-07-20).
 - ☑ Status-bar truth pass: branch/ahead/behind plus real derived sync state
   (up to date, ahead, behind, diverged, or conflicts) and modified/staged
   counts. Commit signing belongs to `SignatureSummary`; LFS/auth remain system-

docs/learnings.md

@@ -1919,6 +1919,15 @@ state. Surface CSS may size or skin the underlying select, but must size the
 `.select-control` wrapper too whenever the old select was itself a flex or grid
 item; otherwise the wrapper, rather than the select, becomes the layout child.
 
+**Linux shares Ctrl shortcuts, not Windows window chrome (2026-07-20).** Keep
+Linux as a distinct `Platform` even when shortcut formatting branches only on
+macOS versus non-macOS. Collapsing Linux into `win11` makes key labels correct
+but incorrectly opts it into Strand's custom Windows caption controls;
+collapsing it into `mac` preserves native chrome but emits Command glyphs and
+macOS toolbar spacing. Platform detection must identify all three targets, and
+individual surfaces may deliberately group Windows and Linux with a non-macOS
+predicate.
+
 **Embedding a file document must not change its editing contract (2026-07-20).**
 Work's tab chrome is presentation context, not an access-control boundary.
 Existing complete UTF-8 working-tree files remain editable whether the shared

ui/src/lib/keys.test.ts

@@ -127,6 +127,7 @@ describe('formatBinding', () => {
     expect(formatBinding('Mod+Shift+P', 'win11')).toBe('Ctrl+Shift+P');
     expect(formatBinding('Mod+1', 'win11')).toBe('Ctrl+1');
     expect(formatBinding('Mod+Enter', 'win11')).toBe('Ctrl+Enter');
+    expect(formatBinding('Mod+Enter', 'linux')).toBe('Ctrl+Enter');
   });
 
   it('returns empty for an unbound command', () => {

ui/src/lib/keys.ts

@@ -255,7 +255,7 @@ const WIN_KEY: Record<string, string> = {
  * Render a binding for display. macOS uses glyphs joined tight (`⌘⇧P`); other
  * platforms use words joined with `+` (`Ctrl+Shift+P`).
  */
-export function formatBinding(binding: string | null, platform: 'mac' | 'win11'): string {
+export function formatBinding(binding: string | null, platform: 'mac' | 'win11' | 'linux'): string {
   if (!binding) return '';
   const mac = platform === 'mac';
   const mods = mac ? MAC_MOD : WIN_MOD;

ui/src/stores/settings.ts

@@ -12,7 +12,7 @@ export type ThemePref = Theme | 'system';
 /** Accent color preset. Each id maps to an OKLCH hue via a `[data-accent]`
  * block in tokens.css; the registry lives in `lib/theme.ts` (`ACCENT_OPTIONS`). */
 export type AccentId = 'amber' | 'rose' | 'magenta' | 'violet' | 'blue' | 'cyan' | 'teal' | 'green';
-export type Platform = 'mac' | 'win11';
+export type Platform = 'mac' | 'win11' | 'linux';
 export type Density = 'compact' | 'default' | 'relaxed';
 export type DiffMode = 'stacked' | 'split';
 export type GraphStyle = 'classic' | 'bold' | 'mono';
@@ -69,10 +69,12 @@ function detectPlatform(): Platform {
     .__TAURI_OS_PLUGIN_INTERNALS__;
   if (internals?.os_type === 'windows') return 'win11';
   if (internals?.os_type === 'macos') return 'mac';
+  if (internals?.os_type === 'linux') return 'linux';
 
   // Fallback for browser mode
   const ua = navigator.userAgent.toLowerCase();
   if (ua.includes('win')) return 'win11';
+  if (ua.includes('linux')) return 'linux';
   return 'mac';
 }
 

ui/src/styles/features.css

@@ -472,6 +472,44 @@
   color: oklch(0 0 0 / 0.6);
   margin-left: 2px;
 }
+.cb-top .cb-commit .commit-chord {
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
+  margin-left: 2px;
+  color: var(--accent-fg);
+}
+.cb-top .cb-commit .commit-chord kbd {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  height: 19px;
+  min-width: 26px;
+  padding: 0 5px;
+  border: 0;
+  border-radius: 4px;
+  background: color-mix(in oklch, var(--accent-fg) 12%, transparent);
+  box-shadow:
+    0 0 0 0.5px color-mix(in oklch, var(--accent-fg) 16%, transparent) inset,
+    0 -1px 0 color-mix(in oklch, var(--accent-fg) 28%, transparent) inset;
+  color: inherit;
+  font-family: var(--font-mono);
+  font-size: 9px;
+  font-weight: 650;
+  line-height: 1;
+}
+.cb-top .cb-commit .commit-chord .chord-plus {
+  font-family: var(--font-mono);
+  font-size: 8px;
+  font-weight: 700;
+  opacity: 0.55;
+}
+.cb-top .cb-commit .commit-chord .enter-key {
+  min-width: 21px;
+  padding: 0;
+  font-family: var(--font-ui);
+  font-size: 14px;
+}
 
 /* Body textarea — content-sized, capped so long messages do not crowd the diff. */
 .cb-body {
@@ -541,6 +579,9 @@
   .cb-top .cb-commit .kbd-inline {
     display: none;
   }
+  .cb-top .cb-commit .commit-chord {
+    display: none;
+  }
 }
 
 .lc-col-head {

ui/src/views/LocalChanges.tsx

@@ -1757,7 +1757,17 @@ function CommitBar({ canCommit, hasChanges }: { canCommit: boolean; hasChanges:
           onClick={() => void submit()}
         >
           {amend ? 'Amend' : 'Commit'}
-          <span className="kbd-inline">{formatBinding('Mod+Enter', platform)}</span>
+          {platform === 'mac' ? (
+            <span className="kbd-inline" aria-hidden="true">
+              {formatBinding('Mod+Enter', platform)}
+            </span>
+          ) : (
+            <span className="commit-chord" aria-hidden="true">
+              <kbd>Ctrl</kbd>
+              <span className="chord-plus">+</span>
+              <kbd className="enter-key">↵</kbd>
+            </span>
+          )}
         </button>
       </div>
       <textarea