[XDanfr]

General Fixes

Aperture was using Media3 features without explicitly acknowledging that those APIs can change between library versions.
They occurred in:

• The three picture-sizing options: Fit, Stretch and Zoom.
• The identifier used to keep audio-track options consistently identified in the QuickMenu.
  Added the required acknowledgements at those locations

Fix library browsing performance

The big one:

1. Movies no longer sorts the same list twice.
2. TV show organisation happens away from the UI thread.
3. 3. Previously opened libraries stay up to date while you’re elsewhere. (The tradeoff is that Aperture keeps that snapshot and its database observer around longer. This is not paging: it still loads the complete list into memory.)

All 32 unit tests passed, including new cases with 1,200 movies and 10,000 episodes, and the debug APK built successfully.

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