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/dashboard/tests/unit/test_forms.py

@@ -1,13 +1,13 @@
 from django.test import SimpleTestCase
 
 from apps.dashboard.forms import (
-    EMPTY_ITEM_ERROR,
-    ItemForm,
+    EMPTY_LINE_ERROR,
+    LineForm,
 )
 
 
-class SimpleItemFormTest(SimpleTestCase):
-    def test_form_validation_for_blank_items(self):
-        form = ItemForm(data={"text": ""})
+class SimpleLineFormTest(SimpleTestCase):
+    def test_form_validation_for_blank_lines(self):
+        form = LineForm(data={"text": ""})
         self.assertFalse(form.is_valid())
-        self.assertEqual(form.errors["text"], [EMPTY_ITEM_ERROR])
+        self.assertEqual(form.errors["text"], [EMPTY_LINE_ERROR])