feat: initial commit - finanzas app

Complete personal finance management application with:
- Dashboard with financial metrics and alerts
- Credit card management and payments
- Fixed and variable debt tracking
- Monthly budget planning
- Intelligent alert system
- Responsive design with Tailwind CSS

Tech stack: Next.js 14, TypeScript, Zustand, Recharts

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

lib/types.ts

@@ -0,0 +1,74 @@
+export interface FixedDebt {
+  id: string
+  name: string
+  amount: number
+  dueDay: number
+  category: 'housing' | 'services' | 'subscription' | 'other'
+  isAutoDebit: boolean
+  isPaid: boolean
+  notes?: string
+}
+
+export interface VariableDebt {
+  id: string
+  name: string
+  amount: number
+  date: string
+  category: 'shopping' | 'food' | 'entertainment' | 'health' | 'transport' | 'other'
+  isPaid: boolean
+  notes?: string
+}
+
+export interface CreditCard {
+  id: string
+  name: string
+  lastFourDigits: string
+  closingDay: number
+  dueDay: number
+  currentBalance: number
+  creditLimit: number
+  color: string
+}
+
+export interface CardPayment {
+  id: string
+  cardId: string
+  amount: number
+  date: string
+  description: string
+  installments?: {
+    current: number
+    total: number
+  }
+}
+
+export interface MonthlyBudget {
+  month: number
+  year: number
+  totalIncome: number
+  fixedExpenses: number
+  variableExpenses: number
+  savingsGoal: number
+}
+
+export interface Alert {
+  id: string
+  type: 'PAYMENT_DUE' | 'BUDGET_WARNING' | 'CARD_CLOSING' | 'CARD_DUE' | 'SAVINGS_GOAL' | 'UNUSUAL_SPENDING'
+  title: string
+  message: string
+  severity: 'info' | 'warning' | 'danger'
+  date: string
+  isRead: boolean
+  relatedId?: string
+}
+
+export interface AppState {
+  fixedDebts: FixedDebt[]
+  variableDebts: VariableDebt[]
+  creditCards: CreditCard[]
+  cardPayments: CardPayment[]
+  monthlyBudgets: MonthlyBudget[]
+  alerts: Alert[]
+  currentMonth: number
+  currentYear: number
+}