feat(extraordinary-expenses): Add module for extraordinary expenses

Introduces a new module to manage and track extraordinary expenses within condominiums. This includes defining expense items, sharing arrangements, and attaching relevant documents.

The module adds new types for `ExpenseItem`, `ExpenseShare`, and `ExtraordinaryExpense`. Mock database functions are updated to support fetching, creating, and managing these expenses. UI components in `Layout.tsx` and `Settings.tsx` are modified to include navigation and feature toggling for extraordinary expenses. Additionally, new routes are added in `App.tsx` for both administrative and user-facing views of these expenses.

services/mockDb.ts

@@ -1,5 +1,5 @@
 
-import { Family, Payment, AppSettings, User, AlertDefinition, Condo, Notice, NoticeRead, Ticket, TicketAttachment, TicketComment, SmtpConfig } from '../types';
+import { Family, Payment, AppSettings, User, AlertDefinition, Condo, Notice, NoticeRead, Ticket, TicketAttachment, TicketComment, SmtpConfig, ExtraordinaryExpense } from '../types';
 
 // --- CONFIGURATION TOGGLE ---
 const FORCE_LOCAL_DB = false; 
@@ -343,6 +343,44 @@ export const CondoService = {
       });
   },
 
+  // --- EXTRAORDINARY EXPENSES ---
+
+  getExpenses: async (condoId?: string): Promise<ExtraordinaryExpense[]> => {
+      let url = '/expenses';
+      const activeId = condoId || CondoService.getActiveCondoId();
+      if (activeId) url += `?condoId=${activeId}`;
+      return request<ExtraordinaryExpense[]>(url);
+  },
+
+  getExpenseDetails: async (id: string): Promise<ExtraordinaryExpense> => {
+      return request<ExtraordinaryExpense>(`/expenses/${id}`);
+  },
+
+  createExpense: async (data: any): Promise<void> => {
+      const activeId = CondoService.getActiveCondoId();
+      if (!activeId) throw new Error("No active condo");
+      return request('/expenses', {
+          method: 'POST',
+          body: JSON.stringify({ ...data, condoId: activeId })
+      });
+  },
+
+  getExpenseAttachment: async (expenseId: string, attachmentId: string): Promise<any> => {
+      return request(`/expenses/${expenseId}/attachments/${attachmentId}`);
+  },
+
+  getMyExpenses: async (): Promise<any[]> => {
+      const activeId = CondoService.getActiveCondoId();
+      return request(`/my-expenses?condoId=${activeId}`);
+  },
+
+  payExpense: async (expenseId: string, amount: number): Promise<void> => {
+      return request(`/expenses/${expenseId}/pay`, {
+          method: 'POST',
+          body: JSON.stringify({ amount, notes: 'PayPal Payment' })
+      });
+  },
+
   // --- SEEDING ---
   seedPayments: () => {
     // No-op in remote mode