Fix username rendering

Co-Authored-By: tamaina <tamaina@hotmail.co.jp>

src/client/app/desktop/views/components/notes.note.vue

@@ -433,6 +433,8 @@ root(isDark)
 
 				> .username
 					margin 0 .5em 0 0
+					overflow hidden
+					text-overflow ellipsis
 					color isDark ? #606984 : #ccc
 
 				> .info

src/client/app/mobile/views/components/note.vue

@@ -371,6 +371,8 @@ export default Vue.extend({
 
 				> .username
 					margin 0 0.5em 0 0
+					overflow hidden
+					text-overflow ellipsis
 					color #ccc
 
 				> .info