- Rust: extract_title now prioritizes H1 > frontmatter > filename
- Rust: add has_h1 field to VaultEntry for frontend TitleField control
- Frontend: hide TitleField + icon picker when note has H1 in body
- Frontend: breadcrumb shows filename stem instead of display title
- Frontend: new notes use untitled-{type}-{timestamp}.md, no title in frontmatter
- CSS: only hide first H1 in BlockNote when TitleField is visible
- Updated all tests for new title resolution and note creation behavior
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>