feat: add file upload support

web/src/lib/locales/en.ts

@@ -188,6 +188,7 @@ export default {
   'composer.terminal': 'Terminal',
   'composer.abort': 'Abort',
   'composer.switchRemote': 'Switch to remote mode',
+  'composer.attach': 'Attach file',
   'composer.send': 'Send',
 
   // Banners
@@ -221,4 +222,4 @@ export default {
   'misc.permissionRequired': 'permission required',
   'misc.percentLeft': '{percent}% left',
   'misc.online': 'online',
-} as const
+} as const