* Schema revisions for new import flow and thumbnails
* WIP settings
* WIP quick schema fix
* gallery: Image search using ML embeddings
Still very rough around the edges, but basically works.
'uv' gets auto-installed, but currently requires restarting Timelinize before it can be used.
Lots of tunings and optimizations are needed. There is much room for improvement.
Still migrating from imports -> jobs, so that part of the code and schema is still a mess.
* Implement search for similar items
* Finish import/planning rewrite; it compiles and tests pass
* Fix some bugs, probably introduce other bugs
* WIP new import planning page
* Fix Google Photos and Twitter recognition
* Finish most of import page UI; start button still WIP
* WIP: Start Import button
* Fixes to jobs, thumbnail job, import job, etc.
* Implement proper checkpointing support; jobs fixes
