Release v1.4.37 with DLC filenames, instant delete, version display

- Parse <filename> tags from DLC XML for proper file names instead of
  deriving from opaque URLs (fixes download.bin display)
- Optimistic UI removal for package/item delete (instant feedback)
- Show app version in header ("Multi Debrid Downloader vX.X.X")

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/download-manager.ts

@@ -974,9 +974,11 @@ export class DownloadManager extends EventEmitter {
         updatedAt: nowMs()
       };
 
-      for (const link of links) {
+      for (let linkIdx = 0; linkIdx < links.length; linkIdx += 1) {
+        const link = links[linkIdx];
         const itemId = uuidv4();
-        const fileName = filenameFromUrl(link);
+        const hintName = pkg.fileNames?.[linkIdx];
+        const fileName = (hintName && !looksLikeOpaqueFilename(hintName)) ? sanitizeFilename(hintName) : filenameFromUrl(link);
         const item: DownloadItem = {
           id: itemId,
           packageId,