fix: add user feedback for snapshot deletion failures (#1197)

- Add toast.error notification when snapshot deletion fails
- Preserve console.error logging for debugging
- Consistent with error handling patterns in other components
- Improves user experience by providing visible error feedback

surfsense_web/components/public-chat-snapshots/public-chat-snapshots-manager.tsx

@@ -74,6 +74,7 @@ export function PublicChatSnapshotsManager({
 				});
 			} catch (error) {
 				console.error("Failed to delete snapshot:", error);
+				toast.error("Failed to delete snapshot");
 			} finally {
 				setDeletingId(undefined);
 			}