Fix selected count updating in control panel

✅ Fixed:
- updateSelectedCount() now updates control panel directly
- Count now shows real-time updates when checking/unchecking manga
- Added console logging to track count updates
- Also maintains compatibility with popup.js

The control panel should now show correct selected count!

content.js

@@ -532,6 +532,14 @@
   }
 
   function updateSelectedCount() {
+    // Actualizar contador en el control panel
+    const countEl = document.getElementById('selected-count');
+    if (countEl) {
+      countEl.textContent = selectedMangas.size.toString();
+      console.log('🔢 Control panel actualizado:', selectedMangas.size);
+    }
+
+    // También enviar al popup (para compatibilidad)
     chrome.runtime.sendMessage({
       action: 'updateSelectedCount',
       count: selectedMangas.size