chore: update watchlist features and fixes

.sisyphus/drafts/anime-sama-player-fallback.md

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+# Draft: Anime-Sama Player Fallback System
+
+## Requirements
+- **Mode**: Automatique - essayer tous les players jusqu'à en trouver un qui fonctionne
+- **Success Criterion**: Test téléchargement (télécharger un petit chunk pour vérifier)
+- **Workflow**: Si le player détecté échoue, essayer VidMoly, SendVid, Sibnet, etc. automatiquement
+
+## Technical Decisions
+
+### Player Priority Order (for Anime-Sama fallback)
+1. VidMoly - most reliable
+2. SendVid - second most reliable
+3. Sibnet - third
+4. Lpayer - last (requires Playwright, slower)
+
+### Success Detection
+- Download first 10KB of the video
+- If successful (200 OK, valid data), consider player working
+- Cache which player works for future episodes
+
+### Implementation Approach
+1. Add `get_download_link_with_fallback()` method in `AnimeSamaDownloader`
+2. Test each player by downloading first 10KB
+3. Use first player that returns valid data
+4. Cache working player per anime URL/series
+
+## Scope
+- INCLUDE: Anime-Sama downloader with automatic player fallback
+- INCLUDE: Video URL validation via chunk download test
+- INCLUDE: Player caching for performance
+- EXCLUDE: Frontend UI changes (backend only)
+- EXCLUDE: Other anime sites (Anime-Sama only for now)
+
+## Files to Modify
+- `app/downloaders/anime_sites/animesama.py` - Add fallback logic
+- `app/downloaders/base.py` - May need base helper method