Replace the localStorage kanban with the backend-backed board, add typed clients
and a React hook with optimistic updates. Cards can reference static doc pages
and user-created custom pages (new "custom" reference type with purple chips).
Add the agentic orchestrator UI: a per-card panel to launch `pi` runs, watch a
live tool/thought stream over SSE, steer mid-run, and stop — while the board
stays fully interactive. The board page wires the orchestrator and custom-pages
stores into every card.
User-created dynamic doc pages live at /docs/custom/:slug, persisted in the new
backend. The editor offers "Beautify with AI", which regenerates the page as
structured HTML with Mermaid diagrams and replaces the raw markdown source (the
beautified version becomes the page's canonical content and survives edits).
Adds a DocHtml renderer that lazily renders Mermaid blocks, a purple design
token, sidebar/topbar entries for custom pages, and routing.
