Replace billedToTenant boolean with billedTo enum

Migrated from boolean checkbox to enum-based radio buttons for better
flexibility and clarity in tracking bill payment responsibility.

Changes:
- Added BilledTo enum with values 'tenant' and 'landlord'
- Replaced Bill.billedToTenant (boolean) with Bill.billedTo (enum)
- Updated BillEditForm to use radio buttons instead of checkbox
- Updated billActions to handle billedTo enum values
- Updated all display filtering to use enum comparison
- Updated printActions barcode filtering
- Updated translations for radio button labels (en/hr)

The billedTo property is optional for backward compatibility -
undefined values default to BilledTo.Tenant, maintaining current
behavior where only tenant bills are displayed and calculated.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/lib/actions/billActions.ts

@@ -2,7 +2,7 @@
 
 import { z } from 'zod';
 import { getDbClient } from '../dbClient';
-import { Bill, BillAttachment, BillingLocation, YearMonth } from '../db-types';
+import { Bill, BilledTo, BillAttachment, BillingLocation, YearMonth } from '../db-types';
 import { ObjectId } from 'mongodb';
 import { withUser } from '@/app/lib/auth';
 import { AuthenticatedUser } from '../types/next-auth';
@@ -145,7 +145,7 @@ export const updateOrAddBill = withUser(async (user:AuthenticatedUser, locationI
     } = validatedFields.data;
 
     const billPaid = formData.get('billPaid') === 'on';
-    const billedToTenant = formData.get('billedToTenant') === 'on';
+    const billedTo = (formData.get('billedTo') as BilledTo) ?? BilledTo.Tenant;
     const barcodeImage = formData.get('barcodeImage')?.valueOf() as string;
 
     // update the bill in the mongodb
@@ -160,7 +160,7 @@ export const updateOrAddBill = withUser(async (user:AuthenticatedUser, locationI
         const mongoDbSet = billAttachment ? {
             "bills.$[elem].name": billName,
             "bills.$[elem].paid": billPaid,
-            "bills.$[elem].billedToTenant": billedToTenant,
+            "bills.$[elem].billedTo": billedTo,
             "bills.$[elem].attachment": billAttachment,
             "bills.$[elem].notes": billNotes,
             "bills.$[elem].payedAmount": payedAmount,
@@ -169,7 +169,7 @@ export const updateOrAddBill = withUser(async (user:AuthenticatedUser, locationI
         }: {
             "bills.$[elem].name": billName,
             "bills.$[elem].paid": billPaid,
-            "bills.$[elem].billedToTenant": billedToTenant,
+            "bills.$[elem].billedTo": billedTo,
             "bills.$[elem].notes": billNotes,
             "bills.$[elem].payedAmount": payedAmount,
             "bills.$[elem].barcodeImage": barcodeImage,
@@ -194,7 +194,7 @@ export const updateOrAddBill = withUser(async (user:AuthenticatedUser, locationI
             _id: (new ObjectId()).toHexString(),
             name: billName,
             paid: billPaid,
-            billedToTenant: billedToTenant,
+            billedTo: billedTo,
             attachment: billAttachment,
             notes: billNotes,
             payedAmount,
@@ -258,7 +258,7 @@ export const updateOrAddBill = withUser(async (user:AuthenticatedUser, locationI
                                             _id: (new ObjectId()).toHexString(),
                                             name: billName,
                                             paid: false, // New bills in subsequent months are unpaid
-                                            billedToTenant: true, // Default to true for subsequent months
+                                            billedTo: BilledTo.Tenant, // Default to tenant for subsequent months
                                             attachment: null, // No attachment for subsequent months
                                             notes: billNotes,
                                             payedAmount: null,

app/lib/actions/printActions.ts

@@ -1,7 +1,7 @@
 'use server';
 
 import { getDbClient } from '../dbClient';
-import { BillingLocation, Bill } from '../db-types';
+import { BilledTo, BillingLocation, Bill } from '../db-types';
 import { AuthenticatedUser } from '../types/next-auth';
 import { withUser } from '../auth';
 import { unstable_noStore as noStore } from 'next/cache';
@@ -42,7 +42,7 @@ export const fetchBarcodeDataForPrint = withUser(async (user: AuthenticatedUser,
     for (const location of locations) {
         for (const bill of location.bills) {
             // Only include bills that are billed to tenant and have barcode images
-            if (bill.barcodeImage && bill.barcodeImage.trim() !== "" && (bill.billedToTenant ?? true)) {
+            if (bill.barcodeImage && bill.barcodeImage.trim() !== "" && (bill.billedTo ?? BilledTo.Tenant) === BilledTo.Tenant) {
                 printData.push({
                     locationName: location.name,
                     billName: bill.name,

app/lib/db-types.ts

@@ -31,6 +31,11 @@ export interface BillingLocation {
     notes: string|null;
 };
 
+export enum BilledTo {
+    Tenant = "tenant",
+    Landlord = "landlord"
+}
+
 /** Bill basic data */
 export interface Bill {
     _id: string;
@@ -38,8 +43,8 @@ export interface Bill {
     name: string;
     /** is the bill paid */
     paid: boolean;
-    /** true if tenant to cover the bill */
-    billedToTenant: boolean;
+    /** who is billed for the bill */
+    billedTo?: BilledTo;
     /** payed amount amount in cents */
     payedAmount?: number | null;
     /** attached document (optional) */