fix: new-chat confirm uses the site dialog; remove assistant intro paragraph

public/components/assistant.html

@@ -1,7 +1,6 @@
         <div class="module-header assistant-header">
           <div>
             <h2><i class="fas fa-brain" style="color:var(--purple);"></i> AI Clinical Assistant</h2>
-            <p>Ask focused clinical questions over indexed Nextcloud books/resources, or ask for a teaching image directly in the chat box.</p>
           </div>
           <div class="assistant-status" id="assistant-status">
             <span class="assistant-dot"></span>

public/js/clinicalAssistant.js

@@ -656,7 +656,20 @@ import {
 
   function clearConversation(event) {
     if (assistantBusy && !activeAssistantRequest) return;
-    if (event && messages.length && !window.confirm('Start a new chat? Save or download this conversation first if you want to keep it.')) return;
+    if (event && messages.length) {
+      // Use the site's standard inline dialog instead of the native confirm().
+      if (typeof showConfirm === 'function') {
+        showConfirm('Start a new chat? Save or download this conversation first if you want to keep it.', function() {
+          performClearConversation();
+        });
+        return;
+      }
+      if (!window.confirm('Start a new chat? Save or download this conversation first if you want to keep it.')) return;
+    }
+    performClearConversation();
+  }
+
+  function performClearConversation() {
     if (activeAssistantRequest) cancelAssistantSearch();
     messages = [];
     attachments = [];