fix(v5): backfill missing canvas uuid columns

Add guarded migration for existing v5 application, cluster, and resource
connection tables missing uuid columns.

Add Vitest, jsdom, and React Testing Library coverage for optimistic
updates, canvas hooks, ingress, resource merging, viewport behavior, and
v5 browser canvas and cluster flows.

package.json

@@ -11,16 +11,19 @@
     },
     "devDependencies": {
         "@tailwindcss/postcss": "4.1.18",
+        "@testing-library/react": "^16.3.2",
         "@types/react": "^19.2.17",
         "@types/react-dom": "^19.2.3",
         "@vitejs/plugin-react": "^5.2.0",
+        "jsdom": "^29.1.1",
         "laravel-vite-plugin": "3.1.0",
         "postcss": "8.5.15",
         "shadcn": "^4.11.0",
         "tailwind-scrollbar": "4.0.2",
         "tailwindcss": "4.1.18",
         "typescript": "^6.0.3",
-        "vite": "8.0.16"
+        "vite": "8.0.16",
+        "vitest": "^4.1.10"
     },
     "dependencies": {
         "@base-ui/react": "^1.5.0",