Show and allow skipping between embedded video chapters

[Kombustor]

No description provided.

[sentry]

Bug: Chapter navigation on TV can call onSeek(NaN) if adjacent chapter data is invalid, potentially crashing the player or corrupting watch history.
_{Severity: HIGH}

Suggested Fix

The handleChapterNavigate function should use the same filtered list of valid chapters that the UI uses for navigation, rather than the raw chapters prop. Alternatively, explicitly validate that nextChapter.startTime is a finite number before calling onSeek.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: src/components/video/PlayerControls.tsx#L784-L793

Potential issue: The `handleChapterNavigate` function, used for TV d-pad navigation,
identifies the current chapter within the raw, unfiltered `chapters` array. It then
attempts to navigate to the adjacent chapter in that same raw array. If the video source
provides malformed metadata where an adjacent chapter has an invalid `startTime` (e.g.,
`NaN`), the function will call `onSeek` with this invalid value. This can lead to a
native player crash or corruption of the user's watch history by persisting `NaN` as the
progress.

Also affects:

• src/components/video/ChapterLabel.tsx:1~296

_{Did we get this right? 👍 / 👎 to inform future reviews.}