Add Expenses app

A UI based on [Budget Zen](https://github.com/BrunoBernardino/budgetzen-web) but slightly updated and adjusted for bewCloud. It also features a chart with available money and spent by budgets.

This is useful for envelope-based budgeting.

routes/api/expenses/export-expenses.tsx

@@ -0,0 +1,32 @@
+import { Handlers } from 'fresh/server.ts';
+
+import { Budget, Expense, FreshContextState } from '/lib/types.ts';
+import { getAllBudgetsForExport, getAllExpensesForExport } from '/lib/data/expenses.ts';
+
+interface Data {}
+
+export interface RequestBody {}
+
+export interface ResponseBody {
+  success: boolean;
+  jsonContents: {
+    budgets: (Omit<Budget, 'id' | 'user_id' | 'created_at' | 'extra'> & { extra: Record<never, never> })[];
+    expenses: (Omit<Expense, 'id' | 'user_id' | 'created_at' | 'extra'> & { extra: Record<never, never> })[];
+  };
+}
+
+export const handler: Handlers<Data, FreshContextState> = {
+  async POST(request, context) {
+    if (!context.state.user) {
+      return new Response('Unauthorized', { status: 401 });
+    }
+
+    const newExpenses = await getAllExpensesForExport(context.state.user.id);
+
+    const newBudgets = await getAllBudgetsForExport(context.state.user.id);
+
+    const responseBody: ResponseBody = { success: true, jsonContents: { expenses: newExpenses, budgets: newBudgets } };
+
+    return new Response(JSON.stringify(responseBody));
+  },
+};