fix(deps): update dependency zod to v4

Author: renovate[bot]

package.json

@@ -40,7 +40,7 @@
     "react-icons": "5.5.0",
     "react-syntax-highlighter": "^15.6.1",
     "server-only": "0.0.1",
-    "zod": "3.25.76"
+    "zod": "4.1.13"
   },
   "devDependencies": {
     "@biomejs/biome": "2.2.5",

yarn.lock

@@ -2037,7 +2037,7 @@ __metadata:
     typescript: "npm:5.9.2"
     vite-tsconfig-paths: "npm:5.1.4"
     vitest: "npm:3.2.4"
-    zod: "npm:3.25.76"
+    zod: "npm:4.1.13"
   languageName: unknown
   linkType: soft
 
@@ -5702,9 +5702,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"zod@npm:3.25.76":
-  version: 3.25.76
-  resolution: "zod@npm:3.25.76"
-  checksum: 10c0/5718ec35e3c40b600316c5b4c5e4976f7fee68151bc8f8d90ec18a469be9571f072e1bbaace10f1e85cf8892ea12d90821b200e980ab46916a6166a4260a983c
+"zod@npm:4.1.13":
+  version: 4.1.13
+  resolution: "zod@npm:4.1.13"
+  checksum: 10c0/d7e74e82dba81a91ffc3239cd85bc034abe193a28f7087a94ab258a3e48e9a7ca4141920cac979a0d781495b48fc547777394149f26be04c3dc642f58bbc3941
   languageName: node
   linkType: hard