This introduces a new stage in the watch history feed pipeline that fetches missing video metadata from relays. Since watch history storage was optimized to store only event IDs, this hydration step ensures that the UI can display titles and thumbnails without requiring them to be persisted in the history payload itself.
- Implemented `createWatchHistoryHydrationStage` in `js/feedEngine/watchHistoryFeed.js`.
- Integrated `convertEventToVideo` to transform fetched events into usable video objects.
- Added a comprehensive integration test in `tests/watch-history.test.mjs` verifying the full flow from ID-only storage to hydrated feed items.
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