Wire notifyThemeSaved through the frontmatter update chain so CSS
variables update immediately when:
- The user edits a theme note in raw mode and presses Cmd+S
- A frontmatter property is changed via the inspector panel
Also expose CodeMirror EditorView on the DOM for Playwright test access,
add unit tests for onNotePersisted, and a new Playwright smoke test
that verifies the full raw-editor → save → CSS-vars-update flow.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>