fix: align Hyprland overlay windows to mpv and stop pinning them

- Force-apply exact Hyprland move/resize/setprop dispatches when bounds are provided
- Stop pinning overlay windows; toggle pin off when Hyprland reports pinned=true
- Compensate stats overlay outer placement for Electron/Wayland content insets
- Make stats overlay window and page opaque so mpv cannot show through transparent insets
- Constrain stats app to h-screen with internal scroll so content covers mpv from y=0
- Lock overlay/stats window titles against page-title-updated events
- Add regression coverage for placement dispatches, inset compensation, and CSS overlay mode

stats/src/App.tsx

@@ -127,7 +127,7 @@ export function App() {
   );
 
   return (
-    <div className="min-h-screen flex flex-col bg-ctp-base">
+    <div className="h-screen min-h-0 overflow-hidden flex flex-col bg-ctp-base">
       <header className="px-4 pt-3 pb-0">
         <button
           type="button"
@@ -139,7 +139,7 @@ export function App() {
         </button>
         <TabBar activeTab={activeTab} onTabChange={handleTabChange} />
       </header>
-      <main className="flex-1 overflow-y-auto p-4">
+      <main className="flex-1 min-h-0 overflow-y-auto p-4">
         {mediaDetail ? (
           <Suspense fallback={<LoadingSurface label="Loading media detail..." />}>
             <MediaDetailView