Fix Windows overlay z-order on minimize/restore and improve hover stability

Use native synchronous z-order binding (koffi) instead of async PowerShell
for overlay positioning, eliminating the 200-500ms delay that left the overlay
behind mpv after restore. Hide the overlay immediately when mpv is minimized
so the full show/reveal/z-order flow triggers cleanly on restore.

Also adds hover suppression after visibility recovery and window resize to
prevent spurious auto-pause, Windows secondary subtitle titlebar fix, and
z-order sync burst retries on geometry changes.

src/window-trackers/windows-helper.ts

@@ -384,6 +384,21 @@ export function ensureWindowsOverlayTransparencyNative(overlayHwnd: number): boo
   }
 }
 
+export function bindWindowsOverlayAboveMpvNative(overlayHwnd: number): boolean {
+  try {
+    const win32 = require('./win32') as typeof import('./win32');
+    const poll = win32.findMpvWindows();
+    const focused = poll.matches.find((m) => m.isForeground);
+    const best = focused ?? poll.matches.sort((a, b) => b.area - a.area)[0];
+    if (!best) return false;
+    win32.bindOverlayAboveMpv(overlayHwnd, best.hwnd);
+    win32.ensureOverlayTransparency(overlayHwnd);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
 export function clearWindowsOverlayOwnerNative(overlayHwnd: number): boolean {
   try {
     const win32 = require('./win32') as typeof import('./win32');