[scrobbles] Fix LookupError in scrobble start and long-plays media lookups (868e2a91)

PROJECT.org

@@ -746,6 +746,23 @@ Import gym sessions and routines from a Flexify backup.
 - `WorkoutImport` model (`BaseFileImportMixin`, new `file_hash` field for
   change detection), admin, DRF `workout-imports` viewset, planned-exercises
   block on the routine detail template, and MCP routine dict update.
+** TODO [#B] Fix LookupError on scrobble start/long-plays views :bug:scrobbles:videos:
+:PROPERTIES:
+:ID:       868e2a91-c974-4656-a8ae-b90a1f94ae74
+:END:
+
+- `PLAY_AGAIN_MEDIA["channels"]` and `LONG_PLAY_MEDIA["papers"]` keyed models
+  by app labels that don't exist (`Channel` lives in `videos`, `Paper` in
+  `books`), so `scrobble_start`, `scrobble_longplay_finish`, and the long-plays
+  views raised `LookupError: No installed app with label 'channels'` for every
+  request.
+- `scrobble_start` now special-cases `channels` to the `videos` app and skips
+  unknown app labels; a shared `get_long_play_media_model()` helper in
+  `scrobbles/utils.py` maps the `papers` label to `books` for the long-play
+  lookups.
+- Also fixed `Channel.scrobble_for_user` which still used the pre-refactor
+  `Scrobble.create_or_update(media_object=...)` signature (would raise
+  `TypeError` once the lookup reached it).
 * Version 64.5 [1/1]
 ** DONE [#B] Clean up issues with org-mode notes :orgmode:notes:scrobbles:
 :PROPERTIES: