fix: increase memory limit for vitest and improve test stability

- Updated test scripts in package.json to set NODE_OPTIONS for increased memory limit.
- Added safety checks for remote servers and domains in ProxyHostForm component to prevent errors.
- Refactored Notifications tests to remove unnecessary use of fake timers and improve clarity.
- Updated ProxyHosts extra tests to specify button names for better accessibility.
- Enhanced Security functional tests by centralizing translation strings and improving mock implementations.
- Adjusted test setup to suppress specific console errors related to act() warnings.
- Modified vitest configuration to limit worker usage and prevent memory issues during testing.

frontend/src/test/setup.ts

@@ -128,6 +128,7 @@ console.error = (...args: unknown[]) => {
     if (typeof msg === 'string') {
       if (
         msg.includes("The current testing environment is not configured to support act(") ||
+        msg.includes('not wrapped in act(') ||
         msg.includes('Test connection failed') ||
         msg.includes('Connection failed')
       ) {