rename: Note→Post/Line (dashboard); Recognition→Note (drama); new-post/my-posts to billboard

- dashboard: Note→Post, Item→Line across models, forms, views, API, urls & tests
- new-post (9×3) & my-posts (3×3) applets migrate from dashboard→billboard context; billboard view passes form & recent_posts
- drama: Recognition→Note, related_name notes; billboard URL /recognition/→/my-notes/, set-palette at /note/<slug>/set-palette
- recognition.js→note.js (module Note, data.note key); recognition-page.js→note-page.js; .recog-*→.note-*
- _recognition.scss→_note.scss; BillNotes page header; applet slug billboard-recognition→billboard-notes (My Notes)
- NoteSpec.js replaces RecognitionSpec.js; test_recognition.py→test_applet_my_notes.py
- 4 migrations applied: dashboard 0004, applets 0011+0012, drama 0005; 683 ITs green

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/drama/models.py

@@ -170,10 +170,10 @@ def record(room, verb, actor=None, **data):
     return GameEvent.objects.create(room=room, actor=actor, verb=verb, data=data)
 
 
-class Recognition(models.Model):
+class Note(models.Model):
     user = models.ForeignKey(
         settings.AUTH_USER_MODEL, on_delete=models.CASCADE,
-        related_name="recognitions",
+        related_name="notes",
     )
     slug = models.SlugField(max_length=60)
     earned_at = models.DateTimeField()