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/src/App.vue

@@ -57,7 +57,7 @@ const handleMenuClose = () => {
 
 // Handle company change
 const handleCompanyChanged = (company) => {
-  console.log('Company changed in App:', company);
+  console.log("Company changed in App:", company);
 };
 
 // Initialize app