Add automatic rent notification feature to LocationEditForm

- Add rentDueNotification toggle to enable automatic rent notifications
- Add rentDueDay selector (1-28) for specifying when rent is due
- Extract tenant email to independent section shown when either autoBillFwd or rentDueNotification is enabled
- Update email validation to be mandatory when any automatic notification is active
- Update database schema to persist rentDueNotification and rentDueDay fields
- Add all database operations to handle new fields with proper defaults
- Add localization strings for English and Croatian

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

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

app/lib/actions/locationActions.ts

@@ -21,6 +21,8 @@ export type State = {
         autoBillFwd?: string[];
         tenantEmail?: string[];
         billFwdStrategy?: string[];
+        rentDueNotification?: string[];
+        rentDueDay?: string[];
     };
     message?:string | null;
 };
@@ -39,6 +41,8 @@ const FormSchema = (t:IntlTemplateFn) => z.object({
     autoBillFwd: z.boolean().optional().nullable(),
     tenantEmail: z.string().email(t("tenant-email-invalid")).optional().or(z.literal("")).nullable(),
     billFwdStrategy: z.enum(["when-payed", "when-attached"]).optional().nullable(),
+    rentDueNotification: z.boolean().optional().nullable(),
+    rentDueDay: z.coerce.number().min(1).max(31).optional().nullable(),
     addToSubsequentMonths: z.boolean().optional().nullable(),
     updateScope: z.enum(["current", "subsequent", "all"]).optional().nullable(),
   })
@@ -64,7 +68,7 @@ const FormSchema = (t:IntlTemplateFn) => z.object({
     path: ["tenantLastName"],
   })
   .refine((data) => {
-    if (data.autoBillFwd) {
+    if (data.autoBillFwd || data.rentDueNotification) {
       return !!data.tenantEmail && data.tenantEmail.trim().length > 0;
     }
     return true;
@@ -95,6 +99,8 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
         autoBillFwd: formData.get('autoBillFwd') === 'on',
         tenantEmail: formData.get('tenantEmail') || null,
         billFwdStrategy: formData.get('billFwdStrategy') as "when-payed" | "when-attached" | undefined,
+        rentDueNotification: formData.get('rentDueNotification') === 'on',
+        rentDueDay: formData.get('rentDueDay') || null,
         addToSubsequentMonths: formData.get('addToSubsequentMonths') === 'on',
         updateScope: formData.get('updateScope') as "current" | "subsequent" | "all" | undefined,
     });
@@ -116,6 +122,8 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
         autoBillFwd,
         tenantEmail,
         billFwdStrategy,
+        rentDueNotification,
+        rentDueDay,
         addToSubsequentMonths,
         updateScope,
     } = validatedFields.data;
@@ -155,6 +163,8 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
                         autoBillFwd: autoBillFwd || false,
                         tenantEmail: tenantEmail || null,
                         billFwdStrategy: billFwdStrategy || "when-payed",
+                        rentDueNotification: rentDueNotification || false,
+                        rentDueDay: rentDueDay || null,
                     }
                 }
             );
@@ -182,6 +192,8 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
                         autoBillFwd: autoBillFwd || false,
                         tenantEmail: tenantEmail || null,
                         billFwdStrategy: billFwdStrategy || "when-payed",
+                        rentDueNotification: rentDueNotification || false,
+                        rentDueDay: rentDueDay || null,
                     }
                 }
             );
@@ -202,6 +214,8 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
                         autoBillFwd: autoBillFwd || false,
                         tenantEmail: tenantEmail || null,
                         billFwdStrategy: billFwdStrategy || "when-payed",
+                        rentDueNotification: rentDueNotification || false,
+                        rentDueDay: rentDueDay || null,
                     }
                 }
             );
@@ -220,6 +234,8 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
             autoBillFwd: autoBillFwd || false,
             tenantEmail: tenantEmail || null,
             billFwdStrategy: billFwdStrategy || "when-payed",
+            rentDueNotification: rentDueNotification || false,
+            rentDueDay: rentDueDay || null,
             yearMonth: yearMonth,
             bills: [],
         });
@@ -290,6 +306,8 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
                         autoBillFwd: autoBillFwd || false,
                         tenantEmail: tenantEmail || null,
                         billFwdStrategy: billFwdStrategy || "when-payed",
+                        rentDueNotification: rentDueNotification || false,
+                        rentDueDay: rentDueDay || null,
                         yearMonth: { year: monthData.year, month: monthData.month },
                         bills: [],
                     });

app/lib/db-types.ts

@@ -55,6 +55,10 @@ export interface BillingLocation {
     tenantEmail?: string | null;
     /** (optional) bill forwarding strategy */
     billFwdStrategy?: "when-payed" | "when-attached" | null;
+    /** (optional) whether to automatically send rent notification */
+    rentDueNotification?: boolean | null;
+    /** (optional) day of month when rent is due (1-31) */
+    rentDueDay?: number | null;
 };
 
 export enum BilledTo {