fix(windows): tighten WebView2 idle hooks from #273 review (#276)

- Type `window.__psyHidden` once via global declaration; drop 6 `(window as any)` casts.
- `WindowVisibilityProvider` now ORs `window.__psyHidden` into the hidden state
  (and into the initial state). On WebView2 `document.hidden` does not always
  flip when `win.hide()` is called, so effects gated by `useWindowVisibility()`
  can now actually skip creating intervals/rAF instead of relying solely on the
  per-tick fallback check.
- Slow visible-poll from 200 ms to 500 ms (5 → 2 wakeups/s for visibility alone).
- Fix stray leading-space indent in `App.tsx` `window:close-requested` comment.

Co-authored-by: Psychotoxical <dev@psysonic.app>

src/components/MiniPlayer.tsx

@@ -239,7 +239,7 @@ export default function MiniPlayer() {
       if (typeof e.payload.volume === 'number') setVolumeState(e.payload.volume);
     });
     const unProgress = listen<ProgressPayload>('audio:progress', (e) => {
-      if (hiddenRef.current || (window as any).__psyHidden) return;
+      if (hiddenRef.current || window.__psyHidden) return;
       setCurrentTime(e.payload.current_time);
       if (e.payload.duration > 0) setDuration(e.payload.duration);
     });