Show the discussion count badge on every state (including 0) instead of
a separate nudge button. Simpler, less intrusive, and works without
needing an extra element near the panel.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Add comment count badge on the Discussion tab (seeded from SSR, updated live)
- Add 'Diskussion starten' nudge above collapsed panel when no comments exist
- Add empty state hint with speech-bubble icon inside the discussion panel
- Fix CommentThread to fire onCountChange with SSR-seeded count on mount
- Add tests for all three behaviours in CommentThread and DocumentBottomPanel
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
