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/static_src/scss/_dashboard.scss

@@ -30,31 +30,6 @@ body.page-dashboard {
 }
 
 #id_applets_container {
-    #id_applet_my_notes {
-        display: flex;
-        flex-direction: column;
-
-
-        .my-notes-container {
-            flex: 1;
-            min-height: 0;
-            overflow-y: auto;
-            -webkit-overflow-scrolling: touch;
-            scrollbar-width: none;
-            &::-webkit-scrollbar { display: none; }
-            mask-origin: padding-box;
-            mask-clip: padding-box;
-            mask-image: linear-gradient(
-                to bottom,
-                transparent 0%,
-                black 5%,
-                black 85%,
-                transparent 100%
-            );
-        }
-
-    }
-
     #id_applet_wallet {
         display: flex;
         flex-direction: column;