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/views.py

@@ -110,14 +110,20 @@ _NOTE_META = {
 @login_required(login_url="/")
 def note_set_palette(request, slug):
     from django.http import Http404
+    from apps.dashboard.views import _unlocked_palettes_for_user
     try:
         note = Note.objects.get(user=request.user, slug=slug)
     except Note.DoesNotExist:
         raise Http404
     if request.method == "POST":
         body = json.loads(request.body)
-        note.palette = body.get("palette", "")
+        palette = body.get("palette", "")
+        note.palette = palette
         note.save(update_fields=["palette"])
+        # Commit as the user's active sitewide palette now that the Note unlocks it.
+        if palette in _unlocked_palettes_for_user(request.user):
+            request.user.palette = palette
+            request.user.save(update_fields=["palette"])
     return JsonResponse({"ok": True})