Finalize assistant and dashboard health updates

frontend/src/lib/components/assistant/AssistantChatPanel.svelte

@@ -260,7 +260,7 @@
   });
 
   $effect(() => {
-    if (isOpen && initialized && conversationId) {
+    if (isOpen && initialized && conversationId && !loading) {
       const currentFirstConversationId = messages.length
         ? messages[0].conversation_id
         : conversationId;
@@ -276,7 +276,7 @@
    * @PRE: text is non-empty command text.
    * @POST: user message appears at the end of messages list.
    */
-  function appendLocalUserMessage(text) {
+  function appendLocalUserMessage(text, targetConversationId = conversationId) {
     console.log("[AssistantChatPanel][message][appendLocalUserMessage][START]");
     messages = [
       ...messages,
@@ -285,6 +285,7 @@
         role: "user",
         text,
         created_at: new Date().toISOString(),
+        conversation_id: targetConversationId || null,
       },
     ];
   }
@@ -296,7 +297,10 @@
    * @PRE: response follows assistant message response contract.
    * @POST: assistant message appended with state/task/actions metadata.
    */
-  function appendAssistantResponse(response) {
+  function appendAssistantResponse(
+    response,
+    targetConversationId = conversationId,
+  ) {
     // prettier-ignore
     console.log("[AssistantChatPanel][message][appendAssistantResponse][START]");
     messages = [
@@ -310,6 +314,7 @@
         confirmation_id: response.confirmation_id || null,
         actions: response.actions || [],
         created_at: response.created_at,
+        conversation_id: response.conversation_id || targetConversationId || null,
       },
     ];
   }
@@ -349,14 +354,15 @@
     console.log("[AssistantChatPanel][message][handleSend][START]");
     const text = input.trim();
     if (!text || loading) return;
+    const requestConversationId = conversationId;
 
-    appendLocalUserMessage(text);
+    appendLocalUserMessage(text, requestConversationId);
     input = "";
     loading = true;
 
     try {
       const response = await sendAssistantMessage({
-        conversation_id: conversationId,
+        conversation_id: requestConversationId,
         message: text,
       });
 
@@ -364,7 +370,10 @@
         setAssistantConversationId(response.conversation_id);
       }
 
-      appendAssistantResponse(response);
+      appendAssistantResponse(
+        response,
+        response.conversation_id || requestConversationId,
+      );
       await loadConversations(true);
     } catch (err) {
       appendAssistantResponse({
@@ -414,6 +423,7 @@
       typeof crypto !== "undefined" && typeof crypto.randomUUID === "function"
         ? crypto.randomUUID()
         : `conv-${Date.now()}`;
+    historyLoadVersion += 1;
     setAssistantConversationId(newId);
     messages = [];
     historyPage = 1;