added endpoint for downloading from extensions

docker/src/scripts/books/reader.js

@@ -187,8 +187,7 @@ async function loadChapter() {
 
         // Lógica específica para contenido LOCAL
         if (provider === 'local') {
-            const unitIndex = Number(currentChapterId); // En local el ID suele ser el índice
-            const unit = data.units[unitIndex];
+            const unit = data.units.find(u => String(u.id) === String(currentChapterId));
 
             if (!unit) {
                 reader.innerHTML = '<div class="loading-container"><span>Chapter not found (Local)</span></div>';
@@ -201,8 +200,12 @@ async function loadChapter() {
             reader.innerHTML = '';
 
             // Setup navegación manual para local (simple index +/- 1)
+            const unitIndex = data.units.findIndex(
+                u => String(u.id) === String(currentChapterId)
+            );
             setupLocalNavigation(unitIndex, data.units.length);
 
+
             if (manifest.type === 'manga') {
                 currentType = 'manga';
                 updateSettingsVisibility();