fix(tv): remote media keys act directly; center the seek preview on the thumb

[JonahMMay]

Brings two fixes to main that missed it.

• The seek-preview alignment commit (8818ec9) was pushed to this branch after fix(tv): fast seek-bar scrubbing, Start Over starts from the beginning #122 merged.
• fix(tv): make the remote's play/pause and transport keys act directly #123 was merged into this branch, which was its stacked base, rather than into main.

Remote media keys act directly (from #123)

In both the live TV and regular players, pressing play/pause on the Samsung remote brought up the controls but didn't pause. Both players now handle the remote's transport keys wherever focus is:

Key	Movies / shows	Live TV
Play/Pause	toggle	toggle
Play / Pause	set that state	set that state
Stop	leave the player	leave the player
FF / Rewind	±15 s	ignored (live)

Seek preview centred on the thumb (8818ec9)

The time bubble was positioned as if it were always as wide as a trickplay thumbnail (176 px), measured against the full width of the bar. Without trickplay it is just a narrow time label, so it sat about 50 px behind the thumb and drifted further toward the ends. It now uses its real width, centred on the thumb's position along the inset track and clamped to the bar (seekPreviewLeft).

Testing

• dart analyze lib test: no issues
• flutter test (prairie_core): 202 passed, including new tests for both fixes.
• Not yet run on the TV.

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Reviewing files that changed from the base of the PR and between 0b8f2e4 and fd1b313.

📒 Files selected for processing (6)

• flutter/packages/prairie_core/lib/prairie_core.dart
• flutter/packages/prairie_core/lib/src/player/remote_media_keys.dart
• flutter/packages/prairie_core/lib/src/screens/live_tv_player_screen.dart
• flutter/packages/prairie_core/lib/src/screens/player_screen.dart
• flutter/packages/prairie_core/test/player/remote_media_keys_test.dart
• flutter/packages/prairie_core/test/screens/player_controls_focus_test.dart

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