chore(deps): update dependency tailwindcss to v4

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

package.json

@@ -84,7 +84,7 @@
         "react-dom": "^19.0.0",
         "react-router-dom": "^7.0.0",
         "storybook": "^10.2.10",
-        "tailwindcss": "^3.4.16",
+        "tailwindcss": "^4.0.0",
         "typescript": "^5.6.2",
         "typescript-eslint": "^8.56.0",
         "vite": "^7.0.0",

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"]
+        }
+    ]
 }

vite.config.ts

@@ -30,6 +30,7 @@ export default defineConfig({
     test: {
         environment: 'jsdom',
         setupFiles: ['./tests/setup.ts'],
+        testTimeout: 10000,
         coverage: {
             provider: 'v8',
             include: ['src/**/*.{ts,tsx}'],