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/models.py

@@ -4,11 +4,11 @@ from django.db import models
 from django.urls import reverse
 
 
-class Note(models.Model):
+class Post(models.Model):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     owner = models.ForeignKey(
         "lyric.User",
-        related_name="notes",
+        related_name="posts",
         blank=True,
         null=True,
         on_delete=models.CASCADE,
@@ -16,24 +16,24 @@ class Note(models.Model):
 
     shared_with = models.ManyToManyField(
         "lyric.User",
-        related_name="shared_notes",
+        related_name="shared_posts",
         blank=True,
     )
 
     @property
     def name(self):
-        return self.item_set.first().text
+        return self.lines.first().text
 
     def get_absolute_url(self):
-        return reverse("view_note", args=[self.id])
+        return reverse("view_post", args=[self.id])
 
-class Item(models.Model):
+class Line(models.Model):
     text = models.TextField(default="")
-    note = models.ForeignKey(Note, default=None, on_delete=models.CASCADE)
+    post = models.ForeignKey(Post, default=None, on_delete=models.CASCADE, related_name="lines")
 
     class Meta:
         ordering = ("id",)
-        unique_together = ("note", "text")
+        unique_together = ("post", "text")
 
     def __str__(self):
         return self.text