Enhance ESLint configuration and improve code consistency

- Added '@typescript-eslint/no-unused-vars' rule to ESLint configuration for better variable management in TypeScript files.
- Updated database.ts to ensure consistent logging format.
- Refactored AuthController and CashflowController to improve variable naming and maintainability.
- Added spacing for better readability in multiple controller methods.
- Adjusted error handling in middleware and repository files for improved clarity.
- Enhanced various service and repository methods to ensure consistent return types and error handling.
- Made minor formatting adjustments across frontend components for improved user experience.

frontend-web/src/components/dialogs/AddAssetDialog.tsx

@@ -35,6 +35,7 @@ export default function AddAssetDialog({open, onOpenChange}: Props) {
     }
 
     setErrors(newErrors);
+
     return isValid;
   };
 

frontend-web/src/components/dialogs/AddInvoiceDialog.tsx

@@ -1,4 +1,4 @@
-import {useState} from 'react';
+import {useState, useEffect} from 'react';
 import {Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle} from '@/components/ui/dialog';
 import {Select, SelectContent, SelectItem, SelectTrigger, SelectValue} from '@/components/ui/select';
 import {Button} from '@/components/ui/button';
@@ -11,6 +11,10 @@ interface Props {
   onOpenChange: (open: boolean) => void;
 }
 
+function getDefaultDueDate(): string {
+  return new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString().split('T')[0];
+}
+
 export default function AddInvoiceDialog({open, onOpenChange}: Props) {
   const dispatch = useAppDispatch();
   const {clients} = useAppSelector(state => state.invoices);
@@ -18,9 +22,17 @@ export default function AddInvoiceDialog({open, onOpenChange}: Props) {
     clientId: '',
     description: '',
     amount: '',
-    dueDate: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString().split('T')[0]
+    dueDate: getDefaultDueDate()
   });
 
+  // Reset form with fresh due date when dialog opens
+  useEffect(() => {
+    if (open) {
+      // eslint-disable-next-line react-hooks/set-state-in-effect -- intentional pattern for form dialog
+      setForm(prev => ({...prev, dueDate: getDefaultDueDate()}));
+    }
+  }, [open]);
+
   const handleSubmit = (e: React.FormEvent) => {
     e.preventDefault();
     const now = new Date().toISOString();
@@ -52,7 +64,7 @@ export default function AddInvoiceDialog({open, onOpenChange}: Props) {
       })
     );
     onOpenChange(false);
-    setForm({clientId: '', description: '', amount: '', dueDate: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString().split('T')[0]});
+    setForm({clientId: '', description: '', amount: '', dueDate: getDefaultDueDate()});
   };
 
   return (

frontend-web/src/components/dialogs/EditAssetDialog.tsx

@@ -20,8 +20,10 @@ export default function EditAssetDialog({open, onOpenChange, asset}: Props) {
   const [form, setForm] = useState({name: '', type: '', value: ''});
   const [errors, setErrors] = useState({name: '', value: ''});
 
+  // Sync form state when asset changes - intentional pattern for controlled form dialogs
   useEffect(() => {
     if (asset) {
+      // eslint-disable-next-line react-hooks/set-state-in-effect -- intentional pattern for form dialog
       setForm({
         name: asset.name,
         type: asset.type,
@@ -47,6 +49,7 @@ export default function EditAssetDialog({open, onOpenChange, asset}: Props) {
     }
 
     setErrors(newErrors);
+
     return isValid;
   };
 

frontend-web/src/components/dialogs/EditClientDialog.tsx

@@ -24,8 +24,10 @@ export default function EditClientDialog({open, onOpenChange, client}: Props) {
   });
   const [errors, setErrors] = useState({name: '', email: '', phone: ''});
 
+  // Sync form state when client changes - intentional pattern for controlled form dialogs
   useEffect(() => {
     if (client) {
+      // eslint-disable-next-line react-hooks/set-state-in-effect -- intentional pattern for form dialog
       setForm({
         name: client.name,
         email: client.email,
@@ -58,6 +60,7 @@ export default function EditClientDialog({open, onOpenChange, client}: Props) {
     }
 
     setErrors(newErrors);
+
     return isValid;
   };
 

frontend-web/src/components/dialogs/EditLiabilityDialog.tsx

@@ -20,8 +20,10 @@ export default function EditLiabilityDialog({open, onOpenChange, liability}: Pro
   const [form, setForm] = useState({name: '', type: '', balance: ''});
   const [errors, setErrors] = useState({name: '', balance: ''});
 
+  // Sync form state when liability changes - intentional pattern for controlled form dialogs
   useEffect(() => {
     if (liability) {
+      // eslint-disable-next-line react-hooks/set-state-in-effect -- intentional pattern for form dialog
       setForm({
         name: liability.name,
         type: liability.type,
@@ -47,6 +49,7 @@ export default function EditLiabilityDialog({open, onOpenChange, liability}: Pro
     }
 
     setErrors(newErrors);
+
     return isValid;
   };
 

frontend-web/src/components/dialogs/InvoiceDetailsDialog.tsx

@@ -25,8 +25,10 @@ export default function InvoiceDetailsDialog({open, onOpenChange, invoice, clien
   const dispatch = useAppDispatch();
   const [selectedStatus, setSelectedStatus] = useState<Invoice['status']>('draft');
 
+  // Sync status when invoice changes - intentional pattern for controlled form dialogs
   useEffect(() => {
     if (invoice) {
+      // eslint-disable-next-line react-hooks/set-state-in-effect -- intentional pattern for form dialog
       setSelectedStatus(invoice.status);
     }
   }, [invoice]);

frontend-web/src/components/dialogs/LoginDialog.tsx

@@ -27,6 +27,7 @@ export default function LoginDialog({open, onOpenChange, onSwitchToSignUp}: Prop
 
     if (!form.email || !form.password) {
       setError('Please enter your email and password');
+
       return;
     }
 
@@ -41,8 +42,9 @@ export default function LoginDialog({open, onOpenChange, onSwitchToSignUp}: Prop
 
       onOpenChange(false);
       setForm({email: '', password: ''});
-    } catch (err: any) {
-      setError(err || 'Login failed. Please check your credentials.');
+    } catch (err) {
+      const message = err instanceof Error ? err.message : String(err);
+      setError(message || 'Login failed. Please check your credentials.');
     } finally {
       setIsLoading(false);
     }

frontend-web/src/components/dialogs/SignUpDialog.tsx

@@ -29,11 +29,13 @@ export default function SignUpDialog({open, onOpenChange, onSwitchToLogin}: Prop
 
     if (form.password !== form.confirmPassword) {
       setError('Passwords do not match');
+
       return;
     }
 
     if (form.password.length < 8) {
       setError('Password must be at least 8 characters');
+
       return;
     }
 
@@ -49,8 +51,9 @@ export default function SignUpDialog({open, onOpenChange, onSwitchToLogin}: Prop
 
       onOpenChange(false);
       setForm({name: '', email: '', password: '', confirmPassword: ''});
-    } catch (err: any) {
-      setError(err || 'Registration failed. Please try again.');
+    } catch (err) {
+      const message = err instanceof Error ? err.message : String(err);
+      setError(message || 'Registration failed. Please try again.');
     } finally {
       setIsLoading(false);
     }