chore: use zod for the AI JSON response schema

Author: jherr

package.json

@@ -17,6 +17,8 @@
 		"@sveltejs/adapter-auto": "^6.1.0",
 		"@sveltejs/kit": "^2.37.0",
 		"@sveltejs/vite-plugin-svelte": "^6.1.3",
+		"@testing-library/jest-dom": "^6.8.0",
+		"@testing-library/svelte": "^5.2.8",
 		"@types/cookie": "^1.0.0",
 		"@types/node": "^24.3.0",
 		"jsdom": "^26.1.0",
@@ -27,16 +29,15 @@
 		"svooltip": "^0.9.0",
 		"typescript": "^5.9.2",
 		"vite": "^7.1.4",
-		"vitest": "^3.2.4",
-		"@testing-library/svelte": "^5.2.8",
-		"@testing-library/jest-dom": "^6.8.0"
+		"vitest": "^3.2.4"
 	},
 	"type": "module",
 	"dependencies": {
 		"colorjs.io": "^0.5.2",
 		"open-props": "^1.7.16",
 		"prism-themes": "^1.9.0",
-		"prismjs": "^1.30.0"
+		"prismjs": "^1.30.0",
+		"zod": "4.1.6-beta.1"
 	},
 	"packageManager": "pnpm@10.15.1"
 }