Add collections, ratings, and soft delete to the catalog
Three features over a shared schema migration. Collections: a tree of manual collections plus smart collections whose membership *is* their stored selector. Dropping images onto a smart collection is refused rather than silently discarded, so the UI can say why the drop did nothing — member rows there would be a second source of truth that nothing reads. Ratings: the star and pick/reject axes, kept independent. Trash: soft delete to a folder, then permanent delete. Catalog::open now backfills after migrating. A migration adds a column but cannot know what the value should be for rows that already existed; backfilling on open is what stops those rows being silently partial. Timeline queries exclude shadowed JPEGs, which would otherwise double every paired shot in the histogram, and gain a range-bounded variant so zooming in returns finer buckets rather than the same coarse ones with the ends cropped. Assisted-by: LLM
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