fix(electron): add dedicated api for opening external links in the default browser (#6166)

packages/frontend/electron/src/main/ui/handlers.ts

@@ -1,4 +1,4 @@
-import { app, nativeTheme } from 'electron';
+import { app, nativeTheme, shell } from 'electron';
 import { getLinkPreview } from 'link-preview-js';
 
 import { isMacOS } from '../../shared/utils';
@@ -122,4 +122,7 @@ export const uiHandlers = {
       };
     }
   },
+  openExternal(_, url: string) {
+    return shell.openExternal(url);
+  },
 } satisfies NamespaceHandlers;