feat: Implement recursive storage listing and directory browsing for backups, and add a migration option to fix cross-filters.

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

@@ -386,6 +386,10 @@
       }
 
       if (action.type === "confirm" && message.confirmation_id) {
+        // Hide buttons immediately to prevent repeated clicks
+        messages = messages.map((m) =>
+          m.message_id === message.message_id ? { ...m, actions: [] } : m,
+        );
         const response = await confirmAssistantOperation(
           message.confirmation_id,
         );
@@ -394,6 +398,10 @@
       }
 
       if (action.type === "cancel" && message.confirmation_id) {
+        // Hide buttons immediately to prevent repeated clicks
+        messages = messages.map((m) =>
+          m.message_id === message.message_id ? { ...m, actions: [] } : m,
+        );
         const response = await cancelAssistantOperation(
           message.confirmation_id,
         );
@@ -608,7 +616,9 @@
                 <span
                   class="text-[11px] font-semibold uppercase tracking-wide text-slate-500"
                 >
-                  {message.role === "user" ? $t.assistant?.you : $t.assistant?.assistant}
+                  {message.role === "user"
+                    ? $t.assistant?.you
+                    : $t.assistant?.assistant}
                 </span>
                 {#if message.state}
                   <span