Document outline + list view

[tayebmokni]

Summary

Build the document outline / list view: a left-sidebar tree of the entire block document. Each row shows indent, block icon, block title (or first text content), and context actions. Click focuses; drag-drop reorders (#107); right-click opens the same More menu as the block toolbar.

Design reference

• docs/04-block-editor.md §3.4 (Document outline / List view)
• docs/04-block-editor.md §15.2 (Screen reader — exposed as role="tree")

Acceptance criteria

• Renders a flat-virtualized tree for the doc (use @tanstack/react-virtual for ≥500 rows)
• Row shows icon + title (block title or excerpt of first text)
• Click focuses the block in the canvas
• Right-click opens block More menu
• Keyboard nav: ↑/↓ moves selection, → expands, ← collapses, Enter focuses canvas
• role="tree" with role="treeitem" and aria-level (§15.2)
• Toggle via Cmd/Ctrl+Alt+M
• Updates reactively as blocks are inserted/removed

Dependencies

#79

Complexity

M

[tayebmokni]

Closing — shipped in Wave P (#465/#466). PR body's auto-close only fired for the first issue.