feat: add Usage Limits Panel component with usage tracking and visual indicators for limits

style: implement custom color schemes and gradients for account section, enhancing visual hierarchy

backend/igny8_core/business/billing/views.py

@@ -866,3 +866,44 @@ class AccountPaymentMethodViewSet(AccountModelViewSet):
             {'count': paginator.page.paginator.count, 'next': paginator.get_next_link(), 'previous': paginator.get_previous_link(), 'results': results},
             request=request
         )
+
+
+# ============================================================================
+# USAGE SUMMARY (Plan Limits) - User-facing endpoint
+# ============================================================================
+
+from rest_framework.decorators import api_view, permission_classes
+
+@api_view(['GET'])
+@permission_classes([IsAuthenticatedAndActive, HasTenantAccess])
+def get_usage_summary(request):
+    """
+    Get comprehensive usage summary for current account.
+    Includes hard limits (sites, users, keywords, clusters) and monthly limits (ideas, words, images).
+    
+    GET /api/v1/billing/usage-summary/
+    """
+    try:
+        account = getattr(request, 'account', None)
+        if not account:
+            return error_response(
+                error='Account not found.',
+                status_code=status.HTTP_400_BAD_REQUEST,
+                request=request
+            )
+        
+        from igny8_core.business.billing.services.limit_service import LimitService
+        summary = LimitService.get_usage_summary(account)
+        
+        return success_response(
+            data=summary,
+            message='Usage summary retrieved successfully.',
+            request=request
+        )
+    except Exception as e:
+        logger.error(f'Error getting usage summary: {str(e)}', exc_info=True)
+        return error_response(
+            error=f'Failed to retrieve usage summary: {str(e)}',
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            request=request
+        )