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/real-data/romfast-reports.spec.js

@@ -5,18 +5,15 @@
  */
 
 import { test, expect } from '@playwright/test';
-import { 
-  authenticateWithRealCredentials, 
+import {
+  authenticateWithRealCredentials,
   selectCompany,
-  getRealCompanies,
-  REAL_CREDENTIALS,
-  API_ENDPOINTS
+  REAL_CREDENTIALS
 } from '../../utils/real-auth.js';
-import { 
+import {
   setupConsoleCapture,
   assertNoCriticalErrors,
   generateErrorReport,
-  PerformanceMonitor,
   PerformanceBaselines,
   assertPerformanceBaseline
 } from '../../utils/console-monitor.js';