- catalog: a row is exactly one folder (no folding of single-child levels);
the UI starts a folder that holds nothing and leads to one folder open
- engine: a library folder is a source (LibrarySource::LibraryFolder with
Session::library_folder, like Local's browse): library.source
{kind: libraryFolder, path}, kept with the library's view, shown by
library.state, followed through folder.rename / folder.move and undo,
dropped back to All Photos when its folder is removed
- ui: clicking a folder replaces whatever the grid showed (Picks, Recently
Deleted, a Local folder…) instead of narrowing it with a filter chip; the
grid is titled after the folder
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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