fix: resolve queue management and metadata fetch bugs

- Reset isRemoving state in DeleteConfirmationModal on open and close to prevent UI freeze
- Filter sidebar queue count to exclude completed downloads
- Return fully resolved URL from backend metadata fetch to avoid 403s on one-time tokens

src/components/DeleteConfirmationModal.tsx

@@ -1,4 +1,4 @@
-import React, { useState } from 'react';
+import React, { useState, useEffect } from 'react';
 import { useDownloadStore } from '../store/useDownloadStore';
 import { AlertTriangle } from 'lucide-react';
 
@@ -7,6 +7,13 @@ export const DeleteConfirmationModal: React.FC = () => {
   const [errorMessage, setErrorMessage] = useState('');
   const [isRemoving, setIsRemoving] = useState(false);
 
+  useEffect(() => {
+    if (deleteModalState.isOpen) {
+      setIsRemoving(false);
+      setErrorMessage('');
+    }
+  }, [deleteModalState.isOpen]);
+
   if (!deleteModalState.isOpen) return null;
 
   const handleCancel = () => {
@@ -38,6 +45,7 @@ export const DeleteConfirmationModal: React.FC = () => {
       setIsRemoving(false);
       return;
     }
+    setIsRemoving(false);
     closeDeleteModal();
   };