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/e2e/button-fix-test.spec.js

@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test } from '@playwright/test';
 import { LoginPage } from '../page-objects/LoginPage.js';
 
 test.describe('🔧 Button Fix Test - Identify Disabled State Issue', () => {
@@ -18,9 +18,8 @@ test.describe('🔧 Button Fix Test - Identify Disabled State Issue', () => {
         const usernameInput = document.getElementById('username');
         const passwordInput = document.querySelector('#password input');
         const button = document.querySelector('button[type="submit"]');
-        
+
         // Get Vue component data if available
-        const vueApp = document.querySelector('#app').__vue__;
         let vueData = null;
         
         try {