feat: add getMedia

src/userscript/types.d.ts

@@ -48,6 +48,8 @@ declare const WPP: {
       },
     ): Promise<any>;
 
+    downloadMedia(msgId: string): Promise<Blob>;
+
     on(event: string, callback: (...args: any[]) => void): void;
   };
 
@@ -60,5 +62,9 @@ declare const WPP: {
     getAllGroups(): Promise<any[]>;
   };
 
+  util: {
+    blobToBase64: (blob: Blob) => Promise<string>;
+  };
+
   on(event: string, callback: (...args: any[]) => void): void;
 };