Beta fixes for playback recovery and image loading.
- Prepare smaller SABR windows after startup and seeks, then fill the buffer progressively.
- Keep retrying visible channel avatars and thumbnails with bounded backoff.
- Prevent loading and error artwork from covering mini-player metadata.
- Retry failed stream loading after the network returns.
Validation: 832 unit tests, no failures; lint and debug/release builds passed. Two emulator runs recovered both forward and backward seeks with H.264/AAC. This does not establish that all playback freezes or audio recovery issues are resolved.
Thanks to everyone testing TypeType and reporting problems.