note palette: swatch previews body palette, NVM reverts, OK saves sitewide; note_set_palette also saves user.palette — TDD

- note-page.js: body class swap on swatch click; 10s auto-revert timer; NVM reverts;
  .note-item--active persists border/glow while modal open; .previewing on swatch
- billboard/views.py: note_set_palette also saves user.palette via _unlocked_palettes_for_user
- _note.scss: .note-swatch-body gradient (palette vars cascade from parent palette-* class);
  .previewing state; .note-item--active; note-palette-modal tooltip glass;
  note-palette-confirm floats below modal (position:absolute, out of flow)
- my_notes.html: note-item__body wrapper; image-box right; swatch row OK buttons removed
- FTs: T2a URL fix (/recognition → /my-notes); T2b split into preview+persist & NVM tests;
  NoteSetPaletteViewTest.test_also_saves_user_palette IT

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/billboard/tests/integrated/test_views.py

@@ -259,6 +259,17 @@ class NoteSetPaletteViewTest(TestCase):
         )
         self.assertEqual(response.status_code, 404)
 
+    def test_also_saves_user_palette(self):
+        """note_set_palette must persist the choice to user.palette so the
+        palette survives page navigation (sitewide commitment)."""
+        self.client.post(
+            self.url,
+            data=_json.dumps({"palette": "palette-bardo"}),
+            content_type="application/json",
+        )
+        self.user.refresh_from_db()
+        self.assertEqual(self.user.palette, "palette-bardo")
+
 
 class SaveScrollPositionTest(TestCase):
     def setUp(self):