fix: Prevent network loop during cleanup operation

- Add isClearing flag to prevent auto-refresh conflicts during deletion
- Use Promise.all() to delete all tasks in parallel instead of sequential await
- Add error handling with try/catch/finally block
- Skip loadDownloads() when isClearing is true

This fixes the infinite network request loop that occurred when clicking cleanup.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

templates/index.html

@@ -838,6 +838,7 @@
         let searchResultsCache = {};
         let allDownloads = [];  // Store all downloads for filtering
         let collapsedGroups = new Set();  // Store which groups are collapsed
+        let isClearing = false;  // Flag to prevent conflicts during cleanup
 
         // Extract series name from filename (for grouping)
         function extractSeriesName(filename) {
@@ -988,12 +989,23 @@
                 return;
             }
 
-            for (const dl of unwanted) {
-                await fetch(`${API_BASE}/download/${dl.id}`, { method: 'DELETE' });
-            }
+            // Set flag to prevent auto-refresh conflicts
+            isClearing = true;
 
+            try {
+                // Delete all in parallel (much faster)
+                await Promise.all(unwanted.map(dl =>
+                    fetch(`${API_BASE}/download/${dl.id}`, { method: 'DELETE' })
+                ));
+            } catch (error) {
+                console.error('Error deleting downloads:', error);
+                alert('Erreur lors de la suppression');
+            } finally {
+                // Clear flag and refresh
+                isClearing = false;
                 loadDownloads();
             }
+        }
 
         // Search Anime across all providers
         async function searchAnime() {
@@ -1506,6 +1518,10 @@
         }
 
         async function loadDownloads() {
+            // Skip refresh if currently clearing downloads to avoid conflicts
+            if (isClearing) {
+                return;
+            }
             const response = await fetch(`${API_BASE}/downloads`);
             const data = await response.json();
             allDownloads = data.downloads;  // Store all downloads