load note.js in dashboard _scripts.html so My Sky applet banner works; fix stale new-note applet seeds in FTs

- _scripts.html: add note.js alongside dashboard.js — Note global now available on dashboard
  page, enabling Note.handleSaveResponse from _applet-my-sky.html save handler
- test_dashboard.py: remove stale new-note applet seed (renamed to new-post/billboard)
- test_room_tray.py: remove stale new-note applet seed

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

src/functional_tests/test_dashboard.py

@@ -9,7 +9,6 @@ from apps.applets.models import Applet
 class DashboardMaintenanceTest(FunctionalTest):
     def setUp(self):
         super().setUp()
-        Applet.objects.get_or_create(slug="new-note", defaults={"name": "New Note"})
         Applet.objects.get_or_create(slug="username", defaults={"name": "Username"})
         Applet.objects.get_or_create(slug="palette", defaults={"name": "Palette"})