fix and update

apps/frontend/lib/chat-media.ts

@@ -31,7 +31,7 @@ const EXTENSION_TO_MIME: Record<string, string> = {
   rar: 'application/vnd.rar',
   '7z': 'application/x-7z-compressed',
   json: 'application/json',
-  xml: 'application/xml'
+  apk: 'application/vnd.android.package-archive'
 };
 
 const MIME_ALIASES: Record<string, string> = {
@@ -110,6 +110,7 @@ export function fileIconLabel(fileName?: string, mimeType?: string) {
   if (['xls', 'xlsx', 'csv'].includes(extension)) return 'XLS';
   if (['ppt', 'pptx'].includes(extension)) return 'PPT';
   if (['zip', 'rar', '7z'].includes(extension)) return 'ZIP';
+  if (extension === 'apk') return 'APK';
   if (extension) return extension.toUpperCase().slice(0, 4);
   return 'FILE';
 }