fix(app): reveal workspace-jump numbers only for the active modifier (#1580)

Holding the workspace-jump modifier reveals numbered badges in the sidebar for jumping to a workspace (Cmd+1..9). On the desktop app the badges also appeared while holding Option or Control, neither of which performs the jump — only Cmd does on macOS desktop (Ctrl on non-Mac, Alt on web).

The keydown/keyup handler flagged badge visibility for Alt on every runtime and for both Meta and Control on desktop — broader than the active workspace.navigate.index binding. Gate the badges to the single modifier that performs the jump on the current runtime, via a new getWorkspaceIndexJumpModifierKey helper. Adds unit tests for the three runtime cases.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

packages/app/src/keyboard/keyboard-shortcuts.test.ts

@@ -3,6 +3,7 @@ import {
   buildKeyboardShortcutHelpSections,
   buildEffectiveBindings,
   getBindingIdForAction,
+  getWorkspaceIndexJumpModifierKey,
   resolveKeyboardShortcut,
   type ChordState,
   type KeyboardShortcutContext,
@@ -638,3 +639,18 @@ describe("keyboard-shortcut help sections", () => {
     ).toBeNull();
   });
 });
+
+describe("getWorkspaceIndexJumpModifierKey", () => {
+  it("uses Alt on web, regardless of OS", () => {
+    expect(getWorkspaceIndexJumpModifierKey({ isMac: true, isDesktop: false })).toBe("Alt");
+    expect(getWorkspaceIndexJumpModifierKey({ isMac: false, isDesktop: false })).toBe("Alt");
+  });
+
+  it("uses Cmd (Meta) on desktop Mac, not Control or Alt", () => {
+    expect(getWorkspaceIndexJumpModifierKey({ isMac: true, isDesktop: true })).toBe("Meta");
+  });
+
+  it("uses Ctrl on desktop non-Mac, not Meta or Alt", () => {
+    expect(getWorkspaceIndexJumpModifierKey({ isMac: false, isDesktop: true })).toBe("Control");
+  });
+});

packages/app/src/keyboard/keyboard-shortcuts.ts

@@ -1344,6 +1344,21 @@ export function getDefaultKeysForAction(
   return null;
 }
 
+/**
+ * The `KeyboardEvent.key` whose hold reveals the sidebar workspace-jump number
+ * badges. It must match the modifier of the active `workspace.navigate.index`
+ * binding for this runtime, otherwise the badges appear for a modifier that
+ * does not actually jump: Alt on web, Cmd (Meta) on desktop Mac, Ctrl on
+ * desktop non-Mac.
+ */
+export function getWorkspaceIndexJumpModifierKey(platform: {
+  isMac: boolean;
+  isDesktop: boolean;
+}): "Alt" | "Meta" | "Control" {
+  if (!platform.isDesktop) return "Alt";
+  return platform.isMac ? "Meta" : "Control";
+}
+
 export function buildKeyboardShortcutHelpSections(
   input: KeyboardShortcutPlatformContext,
   bindings: readonly ParsedShortcutBinding[] = DEFAULT_BINDINGS,