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/win32.ts

@@ -216,6 +216,7 @@ export function clearOverlayOwner(overlayHwnd: number): void {
 }
 
 export function bindOverlayAboveMpv(overlayHwnd: number, mpvHwnd: number): void {
+  SetWindowLongPtrW(overlayHwnd, GWLP_HWNDPARENT, mpvHwnd);
   const mpvExStyle = GetWindowLongW(mpvHwnd, GWL_EXSTYLE);
   const mpvIsTopmost = (mpvExStyle & WS_EX_TOPMOST) !== 0;