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/functional_tests/my_posts_page.py

@@ -0,0 +1,22 @@
+from selenium.webdriver.common.by import By
+
+from apps.lyric.models import User
+
+
+class MyPostsPage:
+    def __init__(self, test):
+        self.test = test
+
+    def go_to_my_posts_page(self, email):
+        self.test.browser.get(self.test.live_server_url)
+        user = User.objects.get(email=email)
+        self.test.browser.get(
+            self.test.live_server_url + f'/dashboard/users/{user.id}/'
+        )
+        self.test.wait_for(
+            lambda: self.test.assertIn(
+                email,
+                self.test.browser.find_element(By.CSS_SELECTOR, ".navbar-identity").text.lower(),
+            )
+        )
+        return self