fix(macos): preserve overlay on transient tracker loss and fix subsync m

- macOS tracker now reports minimized vs not-found so transient helper misses no longer hide the overlay; minimizing mpv still triggers hide
- overlay-runtime-init skips hide on non-minimized window-lost and calls updateVisibleOverlayVisibility instead
- overlay-visibility preserves window level and passthrough state during transient tracker loss
- subsync modal open uses dedicated modal window with retry logic to fix first-attempt flash and stale modal state on macOS

src/core/services/overlay-runtime-init.ts

@@ -105,10 +105,14 @@ export function initializeOverlayRuntime(options: {
     };
     windowTracker.onWindowLost = () => {
       options.releaseOverlayOwner?.();
-      for (const window of options.getOverlayWindows()) {
-        window.hide();
+      if (windowTracker.isTargetWindowMinimized()) {
+        for (const window of options.getOverlayWindows()) {
+          window.hide();
+        }
+        options.syncOverlayShortcuts();
+        return;
       }
-      options.syncOverlayShortcuts();
+      options.updateVisibleOverlayVisibility();
     };
     windowTracker.onWindowFocusChange = () => {
       if (options.isVisibleOverlayVisible()) {