v1.2.4: remove eye-button tooltip, restore peek positioning

- Drop the eye button's aria-label ("Peek note") — Obsidian was rendering it
  as a dark hover tooltip that animated in behind the peek, which looked like
  a second window
- Restore the real peek positioning (below by default, flip above only when
  it won't fit) after the diagnostic build

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>