feat(db): add versioned habits and calendar domain contracts

package.json

@@ -14,6 +14,7 @@
     "db:migrate:production": "NODE_ENV=production bun --env-file=.env --env-file=.env.production scripts/migrate.ts"
   },
   "dependencies": {
+    "@nivo/calendar": "^0.99.0",
     "bun-plugin-tailwind": "^0.1.2",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
@@ -24,7 +25,8 @@
     "react-dom": "^19",
     "react-router": "^8.3.1",
     "tailwind-merge": "^3.3.1",
-    "tw-animate-css": "^1.4.0"
+    "tw-animate-css": "^1.4.0",
+    "zod": "^4.5.4"
   },
   "devDependencies": {
     "@types/bun": "latest",