refactor: update error handling to use unknown type for better type safety

frontend/src/components/ForwardAuthSettings.tsx

@@ -35,7 +35,7 @@ export default function ForwardAuthSettings() {
       queryClient.invalidateQueries({ queryKey: ['forwardAuth'] });
       toast.success('Forward Auth configuration saved');
     },
-    onError: (error: any) => {
+    onError: (error: Error & { response?: { data?: { error?: string } } }) => {
       toast.error(error.response?.data?.error || 'Failed to save configuration');
     },
   });
@@ -45,7 +45,7 @@ export default function ForwardAuthSettings() {
       const template = templates[provider];
       setFormData({
         ...formData,
-        provider: provider as any,
+        provider: provider as 'authelia' | 'authentik' | 'pomerium' | 'custom',
         address: template.address,
         trust_forward_header: template.trust_forward_header,
       });

frontend/src/components/ProxyHostForm.tsx

@@ -141,10 +141,11 @@ export default function ProxyHostForm({ host, onSubmit, onCancel }: ProxyHostFor
 
     try {
       await onSubmit(formData)
-    } catch (err: any) {
+    } catch (err: unknown) {
       console.error("Submit error:", err)
       // Extract error message from axios response if available
-      const message = err.response?.data?.error || err.message || 'Failed to save proxy host'
+      const errorObj = err as { response?: { data?: { error?: string } }; message?: string }
+      const message = errorObj.response?.data?.error || errorObj.message || 'Failed to save proxy host'
       setError(message)
     } finally {
       setLoading(false)