Break down the monolithic VideoPlayer component into smaller, highly cohesive modules to improve maintainability and separate concerns.
- Extract UI sub-components into dedicated files (`VideoControls` and `ControlButton`).
- Abstract complex playback state, event listeners, scrubbing, and keyboard shortcuts into a custom `useVideoPlayer` hook.
- Move time formatting utilities to a dedicated `format.ts` file.
- Relocate shared constants and types to dedicated files (`constants.ts` and `types.ts`).
- Simplify the main `VideoPlayer` component to act as a lightweight presentation orchestrator.
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