- Keyboard selection commits: the combobox commits through
  onValueChange instead of per-item clicks, so Enter on a highlighted
  font works, and keyboard highlights scroll the virtualized list into
  view the way the branch selector does.
- The picker popup opens after mount instead of mounting open, so the
  exit transition has a style baseline and close cannot wedge.
- Preview sessions no longer grant local-fonts: untrusted preview
  content must not read the user's installed-font fingerprint. The
  app's own picker runs in the main window session.
- The simple-mode Monospace row keeps the code-font search anchor
  under its custom title.
- A settings-search jump to font smoothing on non-macOS no longer pins
  Advanced on: the target set is platform-gated and each jump expands
  at most once.
- The Advanced preference persists through the shared useLocalStorage
  hook instead of hand-rolled helpers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>