SSR fix:
- ClientOnly wrapper prevents Leaflet/Yjs from running during SSR
- SessionView lazy-loaded to avoid browser API usage on server
Automerge fix:
- Set MERGE_READY_STATE to 'clean' only (was including 'unstable')
- Prevents merging before all CI checks complete
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
