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/templates/apps/billboard/_partials/_applet-new-post.html

@@ -0,0 +1,8 @@
+<section
+    id="id_applet_new_post"
+    style="--applet-cols: {{ entry.applet.grid_cols }}; --applet-rows: {{ entry.applet.grid_rows }};"
+>
+    <h2>New Post</h2>
+    {% url "new_post" as form_action %}
+    {% include "apps/dashboard/_partials/_form.html" with form=form form_action=form_action %}
+</section>