Markdown Editor

What's happening

A split-pane Markdown editor with live preview, powered entirely by callbag-recharge reactive stores.

Left pane: Text editor with keyboard shortcuts (Ctrl+Z undo, Ctrl+Y redo, Tab indent). All text operations go through the textEditor pattern which manages a reactive buffer with undo/redo history.

Right pane: Live Markdown preview. The textEditor pattern's markdown transform renders HTML reactively as you type.

Toolbar: Undo/redo, heading/bold/italic/code/list insertion, word/character/line count, cursor position — all derived reactively from the editor buffer.

Auto-save: Content is debounced (1.5s quiet) then checkpointed via autoSave(). The green/yellow/gray dot shows save status.

Primitives used

• textEditor() — Pattern: buffer + commands + validation + markdown preview
• contentStats() — Utility: reactive word/char/line count from any Store<string>
• cursorInfo() — Utility: reactive line/column from content + cursor position
• autoSave() — Utility: debounce + checkpoint + status in one call
• memoryAdapter() — In-memory checkpoint persistence (swap to indexedDBAdapter for production)