feat: add theme system from jarvis frontend

apps/web/package.json

@@ -15,11 +15,17 @@
     "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
+    "@dnd-kit/core": "^6.3.1",
+    "@dnd-kit/sortable": "^9.0.0",
+    "@dnd-kit/utilities": "^3.2.2",
     "@mosaic/shared": "workspace:*",
     "@mosaic/ui": "workspace:*",
     "@tanstack/react-query": "^5.90.20",
+    "@xyflow/react": "^12.5.3",
     "date-fns": "^4.1.0",
+    "elkjs": "^0.9.3",
     "lucide-react": "^0.563.0",
+    "mermaid": "^11.4.1",
     "next": "^16.1.6",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",