fix(test): exclude e2e/ from vitest's default test glob

Vitest's default include pattern matches any *.spec.ts, so it was
picking up the new Playwright specs and failing on their test()
fixture API. Caught by CI on the e2e scaffolding PR.

Author: montycheese

vitest.config.mts

@@ -1,6 +1,6 @@
 import path from 'node:path';
 
-import { defineConfig } from 'vitest/config';
+import { configDefaults, defineConfig } from 'vitest/config';
 
 export default defineConfig({
   resolve: {
@@ -10,5 +10,8 @@ export default defineConfig({
   test: {
     globals: true,
     environment: 'node',
+    // Playwright owns e2e/*.spec.ts; vitest's default glob would otherwise
+    // pick them up and fail on the Playwright-only `test()` fixture API.
+    exclude: [...configDefaults.exclude, 'e2e/**'],
   },
 });