feat(chat): improve log message display

frontend/src/components/Message.vue

@@ -92,7 +92,7 @@ watch(() => [props.message.format, props.message.content], ([newFormat, newConte
     </template>
 
     <template v-if="message.type == 'log'">
-      <div class="sender">Log ({{message.sender}})</div>
+      <div class="log-sender">{{message.sender}}<span v-if="message.subkind"> [{{message.subkind}}]</span></div>
       <div class="content">{{content}}</div>
     </template>
 
@@ -155,6 +155,11 @@ watch(() => [props.message.format, props.message.content], ([newFormat, newConte
   font-family: monospace;
   font-size: 80%;
 }
+.message.log .log-sender {
+  font-family: monospace;
+  font-weight: bold;
+  font-size: 80%;
+}
 
 .resource {
   align-self: center;