feat: Frontend CSS refactoring and test improvements

Frontend:
- Refactored CSS architecture with new utility classes
- Updated dashboard components styling
- Improved responsive grid system
- Enhanced typography and variables
- Updated E2E and integration tests

Added:
- Claude Code slash commands for validation
- SSH tunnel and start test scripts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

reports-app/frontend/tests/integration/api-endpoints/health-check.spec.js

@@ -6,11 +6,9 @@
 
 import { test, expect } from '@playwright/test';
 import { API_ENDPOINTS } from '../../utils/real-auth.js';
-import { 
+import {
   setupConsoleCapture,
-  assertNoCriticalErrors,
   generateErrorReport,
-  PerformanceBaselines,
   assertPerformanceBaseline
 } from '../../utils/console-monitor.js';
 
@@ -400,7 +398,7 @@ test.describe('Backend Health Monitoring', () => {
     expect(degradationRatio).toBeLessThan(1.5);
     
     // All cycles should maintain good success rates
-    resourceMetrics.forEach((metric, index) => {
+    resourceMetrics.forEach((metric) => {
       expect(metric.successCount).toBeGreaterThan(2); // At least 3/4 operations successful
     });