clean up malformed cosmik records, add per-page favicons, fix tests
- delete 9 orphaned NOTE cards + recreate URL card with correct semble format
- add thematically distinct SVG favicons (pulse for home, clock for status, graph for memory)
- update test_types to match new to_record() output ($type, createdAt, metadata nesting)
- add tests for CosmikCollection, CosmikCollectionLink, StrongRef, parentCard
- fix pre-existing ruff lint issues
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>