refactor: improve code formatting and consistency in DownloadManager

Buzzheavier fix

src/main/services/download/download-manager.ts

@@ -35,18 +35,27 @@ export class DownloadManager {
   ): string | undefined {
     if (originalUrl?.includes("#")) {
       const hashPart = originalUrl.split("#")[1];
-      if (hashPart && !hashPart.startsWith("http")) return hashPart;
+      if (hashPart && !hashPart.startsWith("http") && hashPart.includes(".")) {
+        return hashPart;
+      }
     }
 
     if (url.includes("#")) {
       const hashPart = url.split("#")[1];
-      if (hashPart && !hashPart.startsWith("http")) return hashPart;
+      if (hashPart && !hashPart.startsWith("http") && hashPart.includes(".")) {
+        return hashPart;
+      }
     }
 
     try {
       const urlObj = new URL(url);
-      const filename = urlObj.pathname.split("/").pop();
-      if (filename?.length) return filename;
+      const pathname = urlObj.pathname;
+      const pathParts = pathname.split("/");
+      const filename = pathParts[pathParts.length - 1];
+
+      if (filename?.includes(".") && filename.length > 0) {
+        return decodeURIComponent(filename);
+      }
     } catch {
       // Invalid URL
     }
@@ -55,7 +64,7 @@ export class DownloadManager {
   }
 
   private static sanitizeFilename(filename: string): string {
-    return filename.replace(/[<>:"/\\|?*]/g, "_");
+    return filename.replaceAll(/[<>:"/\\|?*]/g, "_");
   }
 
   private static createDownloadPayload(
@@ -64,13 +73,19 @@ export class DownloadManager {
     downloadId: string,
     savePath: string
   ) {
-    const filename = this.extractFilename(directUrl, originalUrl);
+    const filename =
+      this.extractFilename(originalUrl, directUrl) ||
+      this.extractFilename(directUrl);
     const sanitizedFilename = filename
       ? this.sanitizeFilename(filename)
       : undefined;
 
     if (sanitizedFilename) {
       logger.log(`[DownloadManager] Using filename: ${sanitizedFilename}`);
+    } else {
+      logger.log(
+        `[DownloadManager] No filename extracted, aria2 will use default`
+      );
     }
 
     return {
@@ -227,10 +242,10 @@ export class DownloadManager {
             )
           ) {
             gameFilesManager.extractDownloadedFile();
-          } else {
+          } else if (download.folderName) {
             gameFilesManager
               .extractFilesInDirectory(
-                path.join(download.downloadPath, download.folderName!)
+                path.join(download.downloadPath, download.folderName)
               )
               .then(() => gameFilesManager.setExtractionComplete());
           }