fix(test): stabilize Zod namespace imports

lib/blocks/schemas.ts

@@ -1,4 +1,4 @@
-import { z } from "zod";
+import * as z from "zod";
 
 const uuid = z.string().uuid();
 const shortText = z.string().trim().min(1).max(160);

lib/content/data-source.ts

@@ -1,4 +1,4 @@
-import { z } from "zod";
+import * as z from "zod";
 
 import { formulaEngine, type FormulaError } from "@/lib/formula";
 

lib/content/lifecycle.ts

@@ -1,4 +1,4 @@
-import { z } from "zod";
+import * as z from "zod";
 
 import { validatePageBlocks, type SerializedBlock } from "@/lib/blocks";