fix: replace native confirm dialog with React dialog for agent deletion

- Replace synchronous confirm() with proper React Dialog component
- Add state management for delete confirmation dialog
- Prevent immediate deletion before user confirmation
- Add loading states and proper error handling
- Improve UX with clear confirmation message and responsive design

src/components/CCAgents.tsx

@@ -30,6 +30,14 @@ import {
   DropdownMenuItem,
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
 import { api, type Agent, type AgentRunWithMetrics } from "@/lib/api";
 import { save, open } from "@tauri-apps/plugin-dialog";
 import { invoke } from "@tauri-apps/api/core";
@@ -87,6 +95,9 @@ export const CCAgents: React.FC<CCAgentsProps> = ({ onBack, className }) => {
   const [selectedAgent, setSelectedAgent] = useState<Agent | null>(null);
   const [selectedRunId, setSelectedRunId] = useState<number | null>(null);
   const [showGitHubBrowser, setShowGitHubBrowser] = useState(false);
+  const [showDeleteDialog, setShowDeleteDialog] = useState(false);
+  const [agentToDelete, setAgentToDelete] = useState<Agent | null>(null);
+  const [isDeleting, setIsDeleting] = useState(false);
 
   const AGENTS_PER_PAGE = 9; // 3x3 grid
 
@@ -122,20 +133,46 @@ export const CCAgents: React.FC<CCAgentsProps> = ({ onBack, className }) => {
     }
   };
 
-  const handleDeleteAgent = async (id: number) => {
-    if (!confirm("Are you sure you want to delete this agent?")) return;
+  /**
+   * Initiates the delete agent process by showing the confirmation dialog
+   * @param agent - The agent to be deleted
+   */
+  const handleDeleteAgent = (agent: Agent) => {
+    setAgentToDelete(agent);
+    setShowDeleteDialog(true);
+  };
+
+  /**
+   * Confirms and executes the agent deletion
+   * Only called when user explicitly confirms the deletion
+   */
+  const confirmDeleteAgent = async () => {
+    if (!agentToDelete?.id) return;
 
     try {
-      await api.deleteAgent(id);
+      setIsDeleting(true);
+      await api.deleteAgent(agentToDelete.id);
       setToast({ message: "Agent deleted successfully", type: "success" });
       await loadAgents();
       await loadRuns(); // Reload runs as they might be affected
     } catch (err) {
       console.error("Failed to delete agent:", err);
       setToast({ message: "Failed to delete agent", type: "error" });
+    } finally {
+      setIsDeleting(false);
+      setShowDeleteDialog(false);
+      setAgentToDelete(null);
     }
   };
 
+  /**
+   * Cancels the delete operation and closes the dialog
+   */
+  const cancelDeleteAgent = () => {
+    setShowDeleteDialog(false);
+    setAgentToDelete(null);
+  };
+
   const handleEditAgent = (agent: Agent) => {
     setSelectedAgent(agent);
     setView("edit");
@@ -473,7 +510,7 @@ export const CCAgents: React.FC<CCAgentsProps> = ({ onBack, className }) => {
                                   <Button
                                     size="sm"
                                     variant="ghost"
-                                    onClick={() => handleDeleteAgent(agent.id!)}
+                                    onClick={() => handleDeleteAgent(agent)}
                                     className="flex items-center gap-1 text-destructive hover:text-destructive"
                                     title="Delete agent"
                                   >
@@ -571,6 +608,50 @@ export const CCAgents: React.FC<CCAgentsProps> = ({ onBack, className }) => {
           setToast({ message: "Agent imported successfully from GitHub", type: "success" });
         }}
       />
+
+      {/* Delete Confirmation Dialog */}
+      <Dialog open={showDeleteDialog} onOpenChange={setShowDeleteDialog}>
+        <DialogContent className="sm:max-w-md">
+          <DialogHeader>
+            <DialogTitle className="flex items-center gap-2">
+              <Trash2 className="h-5 w-5 text-destructive" />
+              Delete Agent
+            </DialogTitle>
+            <DialogDescription>
+              Are you sure you want to delete the agent "{agentToDelete?.name}"? 
+              This action cannot be undone and will permanently remove the agent and all its associated data.
+            </DialogDescription>
+          </DialogHeader>
+          <DialogFooter className="flex flex-col-reverse sm:flex-row sm:justify-end gap-2">
+            <Button
+              variant="outline"
+              onClick={cancelDeleteAgent}
+              disabled={isDeleting}
+              className="w-full sm:w-auto"
+            >
+              Cancel
+            </Button>
+            <Button
+              variant="destructive"
+              onClick={confirmDeleteAgent}
+              disabled={isDeleting}
+              className="w-full sm:w-auto"
+            >
+              {isDeleting ? (
+                <>
+                  <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white mr-2" />
+                  Deleting...
+                </>
+              ) : (
+                <>
+                  <Trash2 className="h-4 w-4 mr-2" />
+                  Delete Agent
+                </>
+              )}
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
     </div>
   );
 };