fix: resolve linting issues

- Add proper typing for ethereum provider
- Remove unused error variables in useSessionPoller
- Remove @ts-ignore comments
- Remove any types
- Handle session errors consistently

frontend/src/components/ForcedWithdrawalDialog.tsx

@@ -15,6 +15,14 @@ interface ForcedWithdrawalDialogProps {
   chainId: number;
 }
 
+interface WalletError extends Error {
+  code: number;
+}
+
+interface EthereumProvider {
+  request: (args: { method: string; params: unknown[] }) => Promise<unknown>;
+}
+
 export function ForcedWithdrawalDialog({
   isOpen,
   onClose,
@@ -46,31 +54,34 @@ export function ForcedWithdrawalDialog({
             message: `Please confirm the network switch in your wallet...`,
           });
 
-          // Request network switch through the wallet
-          // @ts-ignore - ethereum is injected by the wallet
-          await window.ethereum.request({
+          const ethereum = window.ethereum as EthereumProvider | undefined;
+          if (!ethereum) {
+            throw new Error('No wallet detected');
+          }
+
+          await ethereum.request({
             method: 'wallet_switchEthereumChain',
             params: [{ chainId: `0x${targetChainId.toString(16)}` }],
           });
 
           // Wait a bit for the network switch to complete
           await new Promise((resolve) => setTimeout(resolve, 1000));
-        } catch (error: any) {
+        } catch (switchError) {
           // This error code indicates that the chain has not been added to MetaMask
-          if (error.code === 4902) {
+          if ((switchError as WalletError).code === 4902) {
             showNotification({
               type: 'error',
               title: 'Network Not Found',
               message: 'Please add this network to your wallet first.',
             });
           } else {
-            console.error('Error switching network:', error);
+            console.error('Error switching network:', switchError);
             showNotification({
               type: 'error',
               title: 'Network Switch Failed',
               message:
-                error instanceof Error
-                  ? error.message
+                switchError instanceof Error
+                  ? switchError.message
                   : 'Failed to switch network. Please switch manually.',
             });
           }

frontend/src/components/Transfer.tsx

@@ -9,6 +9,14 @@ interface TransferProps {
   onDisableForceWithdraw: () => void;
 }
 
+interface WalletError extends Error {
+  code: number;
+}
+
+interface EthereumProvider {
+  request: (args: { method: string; params: unknown[] }) => Promise<unknown>;
+}
+
 export function Transfer({
   chainId: targetChainId,
   withdrawalStatus,
@@ -34,17 +42,21 @@ export function Transfer({
         });
 
         // Request network switch through the wallet
-        // @ts-ignore - ethereum is injected by the wallet
-        await window.ethereum.request({
+        const ethereum = window.ethereum as EthereumProvider | undefined;
+        if (!ethereum) {
+          throw new Error('No wallet detected');
+        }
+
+        await ethereum.request({
           method: 'wallet_switchEthereumChain',
           params: [{ chainId: `0x${targetChainIdNumber.toString(16)}` }],
         });
 
         // Wait a bit for the network switch to complete
         await new Promise((resolve) => setTimeout(resolve, 1000));
-      } catch (switchError: any) {
+      } catch (switchError) {
         // This error code indicates that the chain has not been added to MetaMask
-        if (switchError.code === 4902) {
+        if ((switchError as WalletError).code === 4902) {
           showNotification({
             type: 'error',
             title: 'Network Not Found',

frontend/src/hooks/useSessionPoller.ts

@@ -59,18 +59,22 @@ export function useSessionPoller(
 
         // Verify session belongs to current address
         if (data.session?.address.toLowerCase() !== address.toLowerCase()) {
-          throw new Error('Session address mismatch');
+          localStorage.removeItem(`session-${address}`);
+          onSessionUpdate(null);
+          return;
         }
 
         // Check if session has expired
         const expiryTime = new Date(data.session.expiresAt).getTime();
         if (expiryTime < Date.now()) {
-          throw new Error('Session expired');
+          localStorage.removeItem(`session-${address}`);
+          onSessionUpdate(null);
+          return;
         }
 
         // Session is valid, set it
         onSessionUpdate(sessionId);
-      } catch (error) {
+      } catch {
         // On any error, clear the session
         localStorage.removeItem(`session-${address}`);
         onSessionUpdate(null);
@@ -107,15 +111,19 @@ export function useSessionPoller(
 
         // Verify session belongs to current address
         if (data.session?.address.toLowerCase() !== address.toLowerCase()) {
-          throw new Error('Session address mismatch');
+          localStorage.removeItem(`session-${address}`);
+          onSessionUpdate(null);
+          return;
         }
 
         // Check if session has expired
         const expiryTime = new Date(data.session.expiresAt).getTime();
         if (expiryTime < Date.now()) {
-          throw new Error('Session expired');
+          localStorage.removeItem(`session-${address}`);
+          onSessionUpdate(null);
+          return;
         }
-      } catch (error) {
+      } catch {
         // On any error, clear the session
         localStorage.removeItem(`session-${address}`);
         onSessionUpdate(null);