data fixes, partial custom indicator support

web/src/components/ChatPanel.vue

@@ -238,14 +238,7 @@ const handleMessage = (data: WebSocketMessage) => {
 
 // Stop agent processing
 const stopAgent = () => {
-  // Send empty message to trigger interrupt without new agent round
-  const wsMessage = {
-    type: 'agent_user_message',
-    session_id: SESSION_ID,
-    content: '',
-    attachments: []
-  }
-  wsManager.send(wsMessage)
+  wsManager.send({ type: 'agent_stop', session_id: SESSION_ID })
   isAgentProcessing.value = false
   removeToolCallBubble()
   lastSentMessageId = null
@@ -586,7 +579,9 @@ onUnmounted(() => {
 }
 
 .workspace-loading {
-  flex: 1;
+  position: fixed;
+  inset: 0;
+  z-index: 9999;
   display: flex;
   flex-direction: column;
   align-items: center;
@@ -639,7 +634,7 @@ onUnmounted(() => {
 .stop-button-container {
   position: absolute;
   bottom: 80px;
-  left: 20px;
+  right: 20px;
   z-index: 1000;
 }