fix(tv): return to the watched channel from live TV, dim video under player UI

[JonahMMay]

Return to the channel you were watching

Leaving the live player rebuilt the guide from scratch, so focus always landed on the first row.

• LiveTvRoute now carries the tab and channel you tuned from (tab, restoreChannelId), following the existing restoreContentId pattern.
• The guide reopens on that tab and moves focus to that channel's row: the Watch button on the Guide tab, or the row itself on the Channels tab.
• Rows build lazily, so for a channel far down the list the guide first jumps the list toward it (proportional estimate, up to 8 retries). Once the row exists, it takes focus and scrolls it into view.
• LiveTvTab moves from a private enum in the screen to route.dart.

Dim the video under the player UI

New PlayerScrim widget, used in both the live TV and regular players:

• 60 % black while the stream is loading, over the frozen first frame, so the loading indicator clearly reads as "not playing yet".
• 35 % black while the chrome is up, to keep player text readable over bright video.
• None while the chrome is hidden. Transitions are animated, and the scrim ignores taps and clicks.

Testing

• dart analyze lib: no issues
• flutter test (prairie_core): all pass, including a new route test
• Not yet run on the TV.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between a29eae2 and 6007aeb.

📒 Files selected for processing (8)

• flutter/packages/prairie_core/lib/prairie_core.dart
• flutter/packages/prairie_core/lib/src/app.dart
• flutter/packages/prairie_core/lib/src/routing/route.dart
• flutter/packages/prairie_core/lib/src/screens/live_tv_player_screen.dart
• flutter/packages/prairie_core/lib/src/screens/live_tv_screen.dart
• flutter/packages/prairie_core/lib/src/screens/player_screen.dart
• flutter/packages/prairie_core/lib/src/widgets/player_scrim.dart
• flutter/packages/prairie_core/test/route_test.dart

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