fixing frontend build issues

Signed-off-by: Dominic Wörner <dom.woe@gmail.com>

Author: domwoe

src/btc_vault_app/src/components/debug/developer-overlay.tsx

@@ -22,7 +22,6 @@ import {
   Play,
   Pause,
   Timer,
-  Settings
 } from 'lucide-react';
 import { APP_GIT_COMMIT } from '@/lib/env';
 
@@ -39,7 +38,6 @@ export function DeveloperOverlay() {
   const [isFunding, setIsFunding] = useState(false);
   const [isAddingNetwork, setIsAddingNetwork] = useState(false);
   const [autoMining, setAutoMining] = useState({ enabled: false, blockTime: 10 });
-  const [isCheckingAutoMining, setIsCheckingAutoMining] = useState(false);
   const [isTogglingAutoMining, setIsTogglingAutoMining] = useState(false);
   const { data: currentBlockHeight, error: blockHeightError } = useCurrentBlockHeight();
   const queryClient = useQueryClient();