user mention (#3771)

src/client/app/mobile/views/pages/user.vue

@@ -55,6 +55,7 @@
 						<b>{{ user.followersCount | number }}</b>
 						<i>{{ $t('followers') }}</i>
 					</a>
+					<button @click="mention"><fa icon="at"/></button>
 				</div>
 			</div>
 		</header>
@@ -126,6 +127,10 @@ export default Vue.extend({
 			});
 		},
 
+		mention() {
+			this.$post({ mention: this.user });
+		},
+
 		menu() {
 			let menu = [{
 				icon: ['fas', 'list'],
@@ -365,6 +370,9 @@ main
 					> i
 						font-size 14px
 
+				> button
+					color var(--text)
+
 	> nav
 		position -webkit-sticky
 		position sticky