chore(ts): use source import extensions

packages/ai/src/utils/validation.ts

@@ -1,7 +1,7 @@
 import { Compile } from "typebox/compile";
 import type { TLocalizedValidationError } from "typebox/error";
 import { Value } from "typebox/value";
-import type { Tool, ToolCall } from "../types.js";
+import type { Tool, ToolCall } from "../types.ts";
 
 const validatorCache = new WeakMap<object, ReturnType<typeof Compile>>();
 const TYPEBOX_KIND = Symbol.for("TypeBox.Kind");