assistant updates

drb-c2-core/app/routers/trips.py

@@ -171,7 +171,7 @@ Guidelines:
 - Format all responses using Markdown: use **bold** for place names and key details, bullet lists for options, and [links](url) for Maps links.
 - When the user mentions places, activities, or asks for suggestions, search for them with search_places before proposing.
 - Use propose_event for each concrete suggestion — one call per event. The user will approve or skip each one.
-- When proposing events, apply relevant tags from the available tags list if any are defined.
+- When proposing events, apply relevant tags. Before using a tag, check if it exists in the available tags list. If it doesn't, call `add_tag` first to create it, then use it in `propose_event`.
 - Be mindful of the existing schedule when assigning times. Avoid obvious conflicts.
 - All proposed dates must fall between {trip["start_date"]} and {trip["end_date"]}.
 - If the user says something like "everyone should be there by 6", factor that into your time proposals.

drb-frontend/app/trips/[id]/page.tsx

@@ -657,14 +657,29 @@ function AssistantPanel({
     );
   }
 
+  function clearChat() {
+    setMessages([]);
+    try { localStorage.removeItem(storageKey); } catch { /* ignore */ }
+  }
+
   return (
     <div className="flex flex-col h-full">
       {/* Header */}
-      <div className="px-4 py-3 border-b border-gray-800 shrink-0">
-        <p className="text-white text-sm font-semibold">Trip Assistant</p>
-        <p className="text-gray-500 text-xs mt-0.5">
-          Tell me what you want to do — I can search places and suggest events.
-        </p>
+      <div className="px-4 py-3 border-b border-gray-800 shrink-0 flex items-start justify-between gap-2">
+        <div>
+          <p className="text-white text-sm font-semibold">Trip Assistant</p>
+          <p className="text-gray-500 text-xs mt-0.5">
+            Tell me what you want to do — I can search places and suggest events.
+          </p>
+        </div>
+        {messages.length > 0 && (
+          <button
+            onClick={clearChat}
+            className="text-xs text-gray-600 hover:text-gray-400 transition-colors shrink-0 mt-0.5"
+          >
+            Clear
+          </button>
+        )}
       </div>
 
       {/* Messages */}