refactor: consolidate watchlist states (#18)

- Rename `watchlist` → `in_watchlist` and `in_progress` → `watching` across the full stack (DB migration, Drizzle schema, core services, API contract, web, native)
- Add a new `caught_up` status for TV shows where all aired episodes are watched but the show is still airing
- Add `titles.watchAll` procedure and `markAllWatched` action to mark every episode of a TV show as watched in one step; replace the old "Mark as Watching" / "Mark as Completed" context-menu actions with "Mark All Watched" (TV) and "Mark as Watched" (movie)
- Extract `display-status.ts` in `@sofa/api` to share status → display label/color logic between web and native
- Add `getDisplayStatusesByTitleIds` to `@sofa/core/tracking` and wire it into the dashboard library feed so clients receive resolved display statuses
- Show a destructive Alert confirmation before removing a title from the library (native)
- Remove "Mark as Completed" from the continue-watching card context menu
- Update i18n catalogs for all 6 locales (de, en, es, fr, it, pt)

packages/api/package.json

@@ -7,7 +7,8 @@
     "./contract": "./src/contract.ts",
     "./schemas": "./src/schemas.ts",
     "./errors": "./src/errors.ts",
-    "./utils": "./src/utils.ts"
+    "./utils": "./src/utils.ts",
+    "./display-status": "./src/display-status.ts"
   },
   "scripts": {
     "lint": "oxlint",