fix(e2e): exclude e2e tests from vitest to prevent version conflict

Vitest was discovering playwright spec files in apps/web/e2e/ and
failing because @playwright/test was loaded alongside playwright,
causing "two different versions" errors.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/vitest.config.ts

@@ -7,6 +7,7 @@ export default defineConfig({
     environment: "jsdom",
     setupFiles: ["./src/test/setup.ts"],
     globals: true,
+    exclude: ["e2e/**"],
     coverage: {
       provider: "v8",
       include: ["src/**"],