Implement Phase 2: Next.js + React Flow frontend MVP

- Scaffold Next.js 15 app with TypeScript, Tailwind, App Router
- Install @xyflow/react, Zustand, Lucide icons, nanoid
- Define council types (AgentNodeData, CouncilBlueprint, WSMessage, etc.)
- Implement Zustand store for canvas and run state
- Build custom AgentNode component (label, system prompt, model badge, tool chips, active pulse)
- Build ConditionalEdge component (dashed indigo line with condition label)
- Build NodeSidebar (drag-and-drop + click to add agents)
- Build NodeSettingsPanel (name, system prompt, model selector, tool toggles)
- Build ArchitectCanvas (React Flow canvas with drop zone, minimap, controls)
- Build blueprint parser (React Flow JSON ↔ CouncilBlueprint JSON)
- Build API client for FastAPI backend (CRUD + run endpoints)
- Build useCouncilWebSocket hook for live agent status via WebSocket
- Build Tab A: Rat-Architekt (canvas builder with save/export toolbar)
- Build Tab B: Konferenzzimmer (execution view with live diagram + result panel)
- Add NavTabs navigation with CouncilOS branding
- All TypeScript checks passing

https://claude.ai/code/session_01EkbecUVn7esdxLCXxVVRDX

frontend/app/globals.css

@@ -0,0 +1,26 @@
+@import "tailwindcss";
+
+:root {
+  --background: #ffffff;
+  --foreground: #171717;
+}
+
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --font-sans: var(--font-geist-sans);
+  --font-mono: var(--font-geist-mono);
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --background: #0a0a0a;
+    --foreground: #ededed;
+  }
+}
+
+body {
+  background: var(--background);
+  color: var(--foreground);
+  font-family: Arial, Helvetica, sans-serif;
+}