- CodeMirror 6 editor with a debounced Mermaid 11 preview (zoom, pan,
auto fit-to-view and inline error reporting)
- project start screen with recent projects, sidebar diagram explorer,
toolbar and a Git panel (status, commit, history, branches)
- SVG/PNG export, per-project theme switching, toasts
- rune-based central store orchestrating all backend calls
- view modes (Code / Split / Preview) plus a viewer mode with a
slide-in quick-edit drawer (Cmd/Ctrl+E)
