feat: v0.3 + v0.4 — frontmatter, templates, outline panel, vault cache
v0.3: Core file reading & markdown infrastructure
- Rust: read_note_with_meta, list_templates, save_attachment commands
- TypeScript: frontmatter.ts (parse/serialize YAML, extract headings)
- OutlinePanel with click-to-scroll headings + tabbed right panel
- CommandPalette: New from Template with {{title}}/{{date}} replacement
- Editor: image drag-and-drop to attachments/
- 130 lines of CSS for outline panel and right panel tabs
v0.4: File reading & caching
- Rust: VaultCache (cache.rs) with mtime-based invalidation
- Rewrote read_note, read_note_with_meta, build_graph, search_vault to use cache
- init_vault_cache (eager scan on startup), get_cache_stats commands
- Frontend LRU noteCache (capacity 20, stale-while-revalidate)
- notify crate added for filesystem watching foundation
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