fix(ci): add testTimeout and Renovate vitest grouping

- Add testTimeout: 10000 to vitest config (DatePicker test flakiness in CI)
- Group vitest and @vitest/coverage-v8 in Renovate to avoid split updates

renovate.json

@@ -1,3 +1,10 @@
 {
-    "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+    "packageRules": [
+        {
+            "groupName": "vitest",
+            "matchPackageNames": ["vitest", "@vitest/coverage-v8"],
+            "matchUpdateTypes": ["minor", "patch"]
+        }
+    ]
 }