fix(mobile): deduplicate assets in person view timeline
Previously, assets with multiple face records for the same person (e.g.,
manual Digikam imports and Immich ML detections) appeared multiple times
in the person timeline. This was caused by an inner join on the
assetFaceEntity without proper deduplication.
This commit refactors the timeline queries to use a subquery approach
instead of joins and grouping. This ensures:
- _getPersonBucketAssets: Only unique assets are fetched, even if
multiple face records exist for a single asset.
- _watchPersonBucket: Asset counts in timeline headers are accurate
and represent unique assets.
- Performance: Database overhead is reduced by avoiding complex joins
and explicit groupBy operations on large result sets.
Signed-off-by: thowdev <12428285+thowdev@users.noreply.github.com>