feat(tests): enhance test coverage and error handling across various components

- Added a test case in CrowdSecConfig to show improved error message when preset is not cached.
- Introduced a new test suite for the Dashboard component, verifying counts and health status.
- Updated SMTPSettings tests to utilize a shared render function and added tests for backend validation errors.
- Modified Security.audit tests to improve input handling and removed redundant export failure test.
- Refactored Security tests to remove export functionality and ensure correct rendering of components.
- Enhanced UsersPage tests with new scenarios for updating user permissions and manual invite link flow.
- Created a new utility for rendering components with a QueryClient and MemoryRouter for better test isolation.
- Updated go-test-coverage script to improve error handling and coverage reporting.

frontend/src/pages/CrowdSecConfig.tsx

@@ -328,13 +328,22 @@ export default function CrowdSecConfig() {
           return
         }
 
+        const errorMsg = err.response?.data?.error || err.message
         const backupPath = (err.response?.data as { backup?: string })?.backup
-        if (backupPath) {
-          setApplyInfo({ status: 'failed', backup: backupPath, cacheKey: presetMeta?.cacheKey })
-          toast.error(`Apply failed. Restore from backup at ${backupPath}`)
+
+        // Check if error is due to missing cache
+        if (errorMsg.includes('not cached') || errorMsg.includes('Pull the preset first')) {
+          toast.error(errorMsg)
+          setValidationError('Preset must be pulled before applying. Click "Pull Preview" first.')
           return
         }
-        toast.error(err.response?.data?.error || err.message)
+
+        if (backupPath) {
+          setApplyInfo({ status: 'failed', backup: backupPath, cacheKey: presetMeta?.cacheKey })
+          toast.error(`Apply failed: ${errorMsg}. Backup created at ${backupPath}`)
+          return
+        }
+        toast.error(`Apply failed: ${errorMsg}`)
       } else {
         toast.error('Failed to apply preset')
       }