fix: resolve double-click and redownload issues

- Use `e.detail === 2` for double clicks in `DownloadTable.tsx`
- Add `user-select: none` to list items in `index.css`
- Delete existing assets before enqueueing in `redownload` action
- Remove redundant `onDoubleClick` props from `DownloadItem.tsx`

src/components/DownloadItem.tsx

@@ -13,7 +13,6 @@ interface DownloadItemProps {
   setContextMenu: (menu: { x: number; y: number; id: string }) => void;
   handlePause: (id: string) => void;
   handleResume: (item: DownloadItemType) => void;
-  handleDoubleClick: (item: DownloadItemType) => void;
   getCategoryIcon: (category: string) => React.ReactNode;
   isSelected: boolean;
   onClick: (e: React.MouseEvent, item: DownloadItemType) => void;
@@ -26,7 +25,6 @@ export const DownloadItem = React.memo<DownloadItemProps>(({
   setContextMenu,
   handlePause,
   handleResume,
-  handleDoubleClick,
   getCategoryIcon,
   isSelected,
   onClick,
@@ -90,7 +88,6 @@ export const DownloadItem = React.memo<DownloadItemProps>(({
         e.preventDefault();
         setContextMenu({ x: e.clientX, y: e.clientY, id: download.id });
       }}
-      onDoubleClick={() => handleDoubleClick(download)}
     >
       <div className="download-file-cell">
         <span className="shrink-0 text-text-muted">

src/components/DownloadTable.tsx

@@ -189,6 +189,10 @@ export const DownloadTable: React.FC<DownloadTableProps> = ({ filter }) => {
     ? [...filteredDownloads].sort((left, right) => (left.queuePosition ?? 0) - (right.queuePosition ?? 0))
     : filteredDownloads;
   const handleItemClick = (e: React.MouseEvent, item: DownloadItem) => {
+    if (e.detail === 2) {
+      handleDownloadDoubleClick(item);
+      return;
+    }
     if (e.metaKey || e.ctrlKey) {
       const newSelected = new Set(selectedIds);
       if (newSelected.has(item.id)) {
@@ -372,7 +376,6 @@ export const DownloadTable: React.FC<DownloadTableProps> = ({ filter }) => {
                   setContextMenu={handleContextMenu}
                   handlePause={handlePause}
                   handleResume={handleResume}
-                  handleDoubleClick={handleDownloadDoubleClick}
                   getCategoryIcon={getCategoryIcon}
                   isSelected={selectedIds.has(d.id)}
                   onClick={handleItemClick}

src/index.css

@@ -1497,6 +1497,8 @@
   border-radius: 6px;
   color: hsl(var(--text-primary));
   font-size: 12px;
+  user-select: none;
+  -webkit-user-select: none;
 }
 
 html[data-list-density="compact"] .download-row,

src/store/useDownloadStore.ts

@@ -470,55 +470,31 @@ export const useDownloadStore = create<DownloadState>((set, get) => ({
     }
 
     const url = targetItem.url?.trim();
-    if (!url) {
-      throw new Error('Cannot redownload: original URL is missing.');
+    if (!url) throw new Error('Cannot redownload: original URL is missing.');
+
+    // Remove from backend to clear its state and delete the existing file so we can overwrite
+    try {
+      await invoke('remove_download', { id, deleteAssets: true });
+      get().unregisterBackendIds([id]);
+    } catch (e) {
+      console.warn("Could not remove old download from backend", e);
     }
 
-    const filename = targetItem.fileName?.trim();
-    if (!filename) {
-      throw new Error('Cannot redownload: original filename is missing.');
-    }
-
-    const mediaFormatSelector = targetItem.mediaFormatSelector?.trim();
-
-    const settings = useSettingsStore.getState();
-    const destPath = targetItem.destination ||
-      await resolveCategoryDestination(settings, targetItem.category);
-
-    if (!destPath.trim()) {
-      throw new Error('Cannot redownload: destination folder is missing.');
-    }
-
-    const redownloadItem: DownloadItem = {
-      id: crypto.randomUUID(),
-      url,
-      fileName: filename,
+    get().updateDownload(id, {
       status: 'queued',
-      category: targetItem.category,
-      dateAdded: new Date().toISOString(),
-      connections: targetItem.connections,
-      speedLimit: targetItem.speedLimit,
-      username: targetItem.username,
-      password: targetItem.password,
-      headers: targetItem.headers,
-      checksum: targetItem.checksum,
-      cookies: targetItem.cookies,
-      mirrors: targetItem.mirrors,
-      destination: destPath,
-      isMedia: targetItem.isMedia,
-      mediaFormatSelector,
-      queueId: targetItem.queueId || MAIN_QUEUE_ID,
-      hasBeenDispatched: false
-    };
+      fraction: 0,
+      speed: '-',
+      eta: '-',
+      hasBeenDispatched: false,
+      dateAdded: Date.now().toString()
+    });
 
-    set((state) => ({
-      downloads: [...state.downloads, redownloadItem]
-    }));
-
-    if (!await dispatchItem(redownloadItem.id)) {
+    if (!await dispatchItem(id)) {
       console.error("Failed to enqueue redownload");
+      get().updateDownload(id, { status: 'failed' });
     } else {
-      info(`Download ${id} redownload requested as ${redownloadItem.id} (queued)`);
+      get().updateDownload(id, { hasBeenDispatched: true });
+      info(`Download ${id} redownloaded (queued)`);
     }
   },
   resumeDownload: async (id) => {