android: startup lag + deep link sometimes resumes old video

[Many0therFunctions]

Two issues, one fix:

1. App lags on first launch — ytDlp().ensureInitialized() runs synchronously on the main thread in OnCreate. It extracts the ytdlp binary + FFmpeg from the APK, blocking the UI thread until it finishes.

2. Opening a YouTube link sometimes resumes the currently playing video instead of navigating — loadUrl() is called without stopLoading() first, so the previous page can keep playing. The onWindowVisibilityChanged always forcing VISIBLE also prevents YouTube from pausing.

Fix (3 small changes in 2 files):

# NouTubeViewModule.kt — OnCreate
- ytDlp().ensureInitialized() // blocks main thread
+ Executors.newSingleThreadExecutor().execute {
+   ytDlp().ensureInitialized() // runs on background thread
+ }

# NouTubeViewModule.kt — loadUrl
+ view.webView.stopLoading()
  view.webView.loadUrl(url)

# NouTubeView.kt — onWindowVisibilityChanged
- super.onWindowVisibilityChanged(VISIBLE)
+ super.onWindowVisibilityChanged(visibility)

Tested on GrapheneOS (Android 17, Pixel 7 Pro) — startup is snappier and deep links navigate correctly on first tap now.

[rnons]

does background playing work with super.onWindowVisibilityChanged(visibility)?