Adds the styling foundation for the UI redesign (vibe-kanban / Magentic-UI /
Langflow references): Tailwind CSS + shadcn/ui primitives, HSL design tokens
(index.css) ported from theme.css, @/ alias, and the App.tsx Board|Pipeline tabs
shell. Extends StateResponse with the backend's existing stages[] for the Board.
theme.css kept transiently until components migrate to Tailwind. No backend
changes. Component fan-out (Board, MapNode, TaskDrawer, TopBar) follows.
New web/ SPA (React 18 + Vite 5 + TypeScript + React Flow + dagre, all pinned, no
CDN). Dark, three-pane layout: summary top bar, filterable task list, center
auto-laid pipeline map, and a right drawer showing a selected task's history
through each node (timeline with timestamps/duration/cost + Q&A/verdicts/plan).
Map nodes color by live state, loop-backs render dashed, clicking a node filters
the list, selecting a task highlights its path. Polls /api/state every 4s;
topology fetched once. dist/ is gitignored (built on the Mac, rsynced).
