## Summary
- Normalize Xtream recently-added timestamps across UI, import, and dashboard query paths.
- Filter future/invalid provider dates before ranking rails and migrate legacy millisecond cache rows.
- Add regression coverage for future timestamps, series date priority, and DB migration behavior.
## Validation
- GitHub checks passed, including Unit Tests and Typechecks, Web E2E, Electron E2E on macOS/Ubuntu/Windows, CodeQL, builds, and Greptile Review.
- Replaced moment.js usage with Intl.DateTimeFormat for date formatting in various components.
- Introduced utility functions `normalizeDateLocale` and `formatWithIntl` for locale normalization and date formatting.
- Updated PlaylistSwitcher, RecentPlaylists, ContentCard, EPG components, and MultiEpgContainer to utilize the new date formatting approach.
- Removed moment-date pipe and related tests, simplifying date handling logic.
- Ensured all date displays respect the current locale settings.
Entire-Checkpoint: 271bd0162027
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