Refactor: Implement DashboardLayout, fix mobile nav, and resolve scroll issues

lib/server-db.ts

@@ -0,0 +1,39 @@
+import fs from 'fs';
+import path from 'path';
+import { AppState } from './types';
+
+const DB_FILE = path.join(process.cwd(), 'data', 'db.json');
+
+const defaultState: AppState = {
+  fixedDebts: [],
+  variableDebts: [],
+  creditCards: [],
+  cardPayments: [],
+  incomes: [],
+  monthlyBudgets: [],
+  serviceBills: [],
+  alerts: [],
+  currentMonth: new Date().getMonth(),
+  currentYear: new Date().getFullYear(),
+};
+
+export function getDatabase(): AppState {
+  if (!fs.existsSync(DB_FILE)) {
+    saveDatabase(defaultState);
+    return defaultState;
+  }
+  try {
+    return JSON.parse(fs.readFileSync(DB_FILE, 'utf8'));
+  } catch (error) {
+    console.error('Database read error:', error);
+    return defaultState;
+  }
+}
+
+export function saveDatabase(data: AppState) {
+  try {
+    fs.writeFileSync(DB_FILE, JSON.stringify(data, null, 2));
+  } catch (error) {
+    console.error('Database write error:', error);
+  }
+}