fix(tv): fast seek-bar scrubbing, Start Over starts from the beginning

[JonahMMay]

Seek bar is slow when holding Left/Right

Each key repeat fired a native seek, and the bar moved only after that seek finished, so holding the key crawled.

Left/Right now scrub instead:

• The target and the preview bubble move immediately (trickplay tile, where one exists).
• The step grows while the key is held: 10 s for the first second, then 30 s, 1 min, and 2 min after 6 s (playerSeekHoldStep). Releasing resets it.
• One seek fires 400 ms after input settles, rather than one per repeat.

Seek preview drifted away from the thumb

The time bubble was placed as if it were always 176 px wide (a trickplay tile) and measured against the full bar width. A bare timecode, which is what every title without trickplay shows, sat about 50 px behind the thumb and drifted further toward the ends. It now lays out from its real width, centred on the thumb's position along the inset track and clamped to the bar (seekPreviewLeft, with tests).

Start Over resumed instead of starting over

The start request dropped any start_position that wasn't positive. The server reads an omitted start_position as "resume where this profile left off", so Start Over, which sent none, always resumed. Start Over now sends an explicit 0, and the request builder keeps any non-null value. Omitting it still means resume.

Testing

• dart analyze lib test: no issues
• flutter test (prairie_core): 199 passed, with new tests for the hold-step curve and the zero start position.
• 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 a122c49.

📒 Files selected for processing (5)

• flutter/packages/prairie_core/lib/src/api/playback_types.dart
• flutter/packages/prairie_core/lib/src/screens/item_detail_screen.dart
• flutter/packages/prairie_core/lib/src/screens/player_screen.dart
• flutter/packages/prairie_core/test/api/playback_v3_test.dart
• flutter/packages/prairie_core/test/screens/player_controls_focus_test.dart

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