Add comprehensive button click debugging

🔍 Now logs:
- Button click events
- Function execution
- selectedMangas Set contents and size
- mangaMetadata Map size
- Each metadata lookup
- Final selectedObjects array
- Button element existence check

This will show us exactly where the chain is breaking!

content.js

@@ -75,28 +75,35 @@
       const btnClearSelection = document.getElementById('btn-clear-selection');
 
       if (btnDownloadSelected) {
-        btnDownloadSelected.addEventListener('click', () => {
-          console.log('🎯 Click: Descargar Seleccionados');
-          // Enviar mensaje al popup.js para ejecutar la descarga
-          chrome.runtime.sendMessage({ action: 'triggerDownloadSelected' });
+        btnDownloadSelected.addEventListener('click', (e) => {
+          console.log('🎯 BUTTON CLICKED: Descargar Seleccionados');
+          console.log('📊 selectedMangas Set contents:', selectedMangas);
+          console.log('📊 selectedMangas size:', selectedMangas.size);
+          downloadSelectedMangas();
         });
+      } else {
+        console.error('❌ btnDownloadSelected not found!');
       }
 
       if (btnDownloadAll) {
-        btnDownloadAll.addEventListener('click', () => {
-          console.log('🎯 Click: Descargar TODOS');
-          chrome.runtime.sendMessage({ action: 'triggerDownloadAll' });
+        btnDownloadAll.addEventListener('click', (e) => {
+          console.log('🎯 BUTTON CLICKED: Descargar TODOS');
+          downloadAllMangas();
         });
+      } else {
+        console.error('❌ btnDownloadAll not found!');
       }
 
       if (btnClearSelection) {
-        btnClearSelection.addEventListener('click', () => {
-          console.log('🎯 Click: Limpiar Selección');
+        btnClearSelection.addEventListener('click', (e) => {
+          console.log('🎯 BUTTON CLICKED: Limpiar Selección');
           selectedMangas.clear();
           updateSelectedCount();
           const countEl = document.getElementById('selected-count');
           if (countEl) countEl.textContent = '0';
         });
+      } else {
+        console.error('❌ btnClearSelection not found!');
       }
 
       // Actualizar contador inicialmente
@@ -590,22 +597,31 @@
 
   // Descargar manga seleccionados
   async function downloadSelectedMangas() {
-    console.log('📥 Iniciando descarga de manga seleccionados...');
+    console.log('\n========== 🔥 DOWNLOAD SELECTED MANGAS STARTED ==========');
+    console.log('🔍 Function called!');
+    console.log('📊 selectedMangas Set:', selectedMangas);
+    console.log('📊 selectedMangas size:', selectedMangas.size);
+    console.log('📊 mangaMetadata Map size:', mangaMetadata.size);
 
     const selectedObjects = [];
     selectedMangas.forEach(id => {
       const mangaObj = mangaMetadata.get(id);
+      console.log(`📝 Checking ID ${id}:`, mangaObj);
       if (mangaObj) {
         selectedObjects.push(mangaObj);
       }
     });
 
+    console.log(`📦 Final selectedObjects array length: ${selectedObjects.length}`);
+    console.log('📦 selectedObjects contents:', selectedObjects);
+
     if (selectedObjects.length === 0) {
+      console.log('❌ No manga selected, showing alert');
       alert('No hay manga seleccionados. Selecciona algunos manga primero.');
       return;
     }
 
-    console.log(`📦 Manga seleccionados: ${selectedObjects.length}`);
+    console.log(`✅ Proceeding with download of ${selectedObjects.length} manga...`);
 
     // Descargar cada manga
     for (let i = 0; i < selectedObjects.length; i++) {