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/api/tests/unit/test_serializers.py

@@ -1,19 +1,19 @@
 from django.test import SimpleTestCase
-from apps.api.serializers import ItemSerializer, NoteSerializer
+from apps.api.serializers import LineSerializer, PostSerializer
 
 
-class ItemSerializerTest(SimpleTestCase):
+class LineSerializerTest(SimpleTestCase):
     def test_fields(self):
-        serializer = ItemSerializer()
+        serializer = LineSerializer()
         self.assertEqual(
             set(serializer.fields.keys()),
             {"id", "text"},
         )
 
-class NoteSerializerTest(SimpleTestCase):
+class PostSerializerTest(SimpleTestCase):
     def test_fields(self):
-        serializer = NoteSerializer()
+        serializer = PostSerializer()
         self.assertEqual(
             set(serializer.fields.keys()),
-            {"id", "name", "url", "items"},
+            {"id", "name", "url", "lines"},
         )