feat(P1+P2): server-authoritative favorites/recent + pre-computed display fields
P1-A: Enrich FavoriteItemDto & RecentItemDto with item_name, item_size,
item_mime_type, parent_id, modified_at via SQL LEFT JOINs — eliminates
N+1 per-item fetches.
P1-B: Rewrite favorites.js as server-authoritative (724→380 lines).
In-memory cache backed by GET /api/favorites; no localStorage.
P1-C: Rewrite recent.js as server-authoritative (341→249 lines).
GET /api/recent + POST /api/recent/{type}/{id}; no localStorage.
P1 cleanup: Remove dead localStorage cleanup from auth.js logout,
fix async clearRecentFiles in app.js.
P2: Add icon_class, icon_special_class, category, size_formatted to
FileDto, FolderDto, FavoriteItemDto, RecentItemDto. New shared
display_helpers.rs module centralises mime→icon/category/size logic.
Frontend (ui.js, fileRenderer.js, favorites.js, recent.js) now reads
pre-computed fields from the API with fallback defaults — eliminates
5 duplicated mime→icon mapping blocks (~89 lines removed).
Also fixes: synthetic FolderDto in webdav_handler.rs, pre-existing
missing item_name field in share_service.rs test.
Net: -307 lines across 15 files. cargo check: 0 errors, 0 warnings.
cargo test display_helpers: 3/3 pass.
Dionisio
fb652c07e3