fix: restore macos overlay passthrough

backlog/tasks/task-260 - Fix-macOS-overlay-subtitle-sidebar-passthrough-without-requiring-a-subtitle-hover-cycle.md

@@ -3,9 +3,11 @@ id: TASK-260
 title: >-
   Fix macOS overlay subtitle sidebar passthrough without requiring a subtitle
   hover cycle
-status: To Do
-assignee: []
+status: Done
+assignee:
+  - '@codex'
 created_date: '2026-03-31 00:58'
+updated_date: '2026-03-31 01:01'
 labels:
   - bug
   - macos
@@ -35,7 +37,31 @@ On macOS, opening the overlay-layout subtitle sidebar should allow click-through
 
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
-- [ ] #1 With the overlay-layout subtitle sidebar open on macOS, areas outside the sidebar pass clicks through immediately after open without requiring a prior subtitle hover.
-- [ ] #2 When no subtitle line is currently visible, opening the subtitle sidebar still leaves non-sidebar overlay regions click-through on macOS.
-- [ ] #3 Regression coverage exercises the first-open/idle passthrough path so overlay interactivity does not depend on a later hover cycle.
+- [x] #1 With the overlay-layout subtitle sidebar open on macOS, areas outside the sidebar pass clicks through immediately after open without requiring a prior subtitle hover.
+- [x] #2 When no subtitle line is currently visible, opening the subtitle sidebar still leaves non-sidebar overlay regions click-through on macOS.
+- [x] #3 Regression coverage exercises the first-open/idle passthrough path so overlay interactivity does not depend on a later hover cycle.
 <!-- AC:END -->
+
+## Implementation Plan
+
+<!-- SECTION:PLAN:BEGIN -->
+1. Add/adjust focused overlay visibility regressions for the tracked macOS visible overlay so the default idle state stays click-through instead of forcing mouse interaction.
+2. Update main-process visible overlay visibility sync to keep the tracked macOS overlay passive by default and let renderer hover/sidebar state opt into interaction.
+3. Run focused verification for overlay visibility and any dependent runtime tests, then update task notes/criteria/final summary with the confirmed outcome.
+<!-- SECTION:PLAN:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+Investigation points to a main-process override on macOS: renderer sidebar open path already requests mouse passthrough outside the panel, but visible-overlay visibility sync still hard-sets the tracked overlay window interactive on macOS (`mouse-ignore:false`). Window-tracker focus/visibility resync can therefore undo renderer passthrough until a later hover cycle re-applies it.
+
+Added a failing regression in `src/core/services/overlay-visibility.test.ts` showing the tracked macOS visible overlay was still forced interactive by main-process visibility sync (`mouse-ignore:false`) instead of staying forwarded click-through.
+
+Updated `src/core/services/overlay-visibility.ts` so tracked macOS visible overlays now default to `setIgnoreMouseEvents(true, { forward: true })`, matching the renderer-side passthrough model and preventing window-tracker/focus resync from undoing idle sidebar clickthrough.
+<!-- SECTION:NOTES:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Fixed the macOS subtitle-sidebar passthrough regression by changing tracked visible-overlay startup/visibility sync to stay click-through by default in the main process. Previously `updateVisibleOverlayVisibility` forced the macOS overlay window interactive, which could override renderer sidebar passthrough until a later hover cycle repaired it. Added a regression in `src/core/services/overlay-visibility.test.ts` and verified with `bun test src/core/services/overlay-visibility.test.ts`, `bun test src/renderer/modals/subtitle-sidebar.test.ts src/renderer/handlers/mouse.test.ts`, and `bun run typecheck`.
+<!-- SECTION:FINAL_SUMMARY:END -->

changes/261-macos-overlay-passthrough.md

@@ -0,0 +1,5 @@
+type: fixed
+area: overlay
+
+- Keep tracked macOS visible overlays click-through by default so subtitle sidebar passthrough works immediately without requiring a subtitle hover cycle first.
+- Add regression coverage for the macOS visible-overlay passthrough default.

src/core/services/overlay-visibility.test.ts

@@ -238,7 +238,7 @@ test('visible overlay stays hidden while a modal window is active', () => {
   assert.ok(!calls.includes('update-bounds'));
 });
 
-test('macOS tracked visible overlay stays visible without passively stealing focus', () => {
+test('macOS tracked visible overlay stays click-through without passively stealing focus', () => {
   const { window, calls } = createMainWindowRecorder();
   const tracker: WindowTrackerStub = {
     isTracking: () => true,
@@ -270,7 +270,7 @@ test('macOS tracked visible overlay stays visible without passively stealing foc
     isWindowsPlatform: false,
   } as never);
 
-  assert.ok(calls.includes('mouse-ignore:false:plain'));
+  assert.ok(calls.includes('mouse-ignore:true:forward'));
   assert.ok(calls.includes('show'));
   assert.ok(!calls.includes('focus'));
 });

src/core/services/overlay-visibility.ts

@@ -37,7 +37,7 @@ export function updateVisibleOverlayVisibility(args: {
 
   const showPassiveVisibleOverlay = (): void => {
     const forceMousePassthrough = args.forceMousePassthrough === true;
-    if (args.isWindowsPlatform || forceMousePassthrough) {
+    if (args.isMacOSPlatform || args.isWindowsPlatform || forceMousePassthrough) {
       mainWindow.setIgnoreMouseEvents(true, { forward: true });
     } else {
       mainWindow.setIgnoreMouseEvents(false);