feat(DM): library UI with episode list, SD status, cache, close button, stable single-file DL
- DiscoveryMountain: new UI optimized for episode list (not player anymore) - Shows episodes for current season, indicates if on SD card (green=On SD, gray=Not DL) - Per-episode action: download single via SdDownloader or play via Mp3Player - DL Missing button for missing eps in season (currently single first missing, batch reverted) - Season selector screen with cached/total counts - Top-right X close button - Seasons/episodes cached to cache.json to avoid network fetch every launch - Fixes: overlay deletion race (deferred timer), ui_timer leak causing crash on close, season selection overwritten by fetch task - Fixes: unicode ellipsis squares - SdDownloader: revert to stable single-file mode (batch array caused crashes) - Remove batch fields and array allocation, keep single url/path download - Result bundle simple success/path/bytes - Mp3Player: add resume position support (pos_sec from bundle, total_sec estimate, total_decoded_samples), return position on exit via bundle for DM to save Tested on 192.168.68.133: opens, shows S10 2/6, Play/DL buttons, close works, no crash on open/close cycles, cache shows 'Loaded from cache, refreshing...'
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Adolfo