feat: add finance module UI

- Finance.jsx: main page with tabs (Dashboard/Transactions/Analytics)
- FinanceDashboard: balance card, top categories, pie chart, daily line chart
- TransactionList: filtered list with search, type/category filters
- AddTransactionModal: bottom sheet with quick templates
- FinanceAnalytics: bar chart, donut chart, monthly trend
- finance.js: API layer
- Navigation: added Wallet icon for Finance
- App.jsx: added /finance route

Design matches Storybook mockups (glassmorphism, Deep Teal palette)

src/App.jsx

@@ -12,6 +12,7 @@ import ResetPassword from "./pages/ResetPassword"
 import ForgotPassword from "./pages/ForgotPassword"
 import Stats from "./pages/Stats"
 import Settings from "./pages/Settings"
+import Finance from "./pages/Finance"
 
 function ProtectedRoute({ children }) {
   const { isAuthenticated, isLoading } = useAuthStore()
@@ -124,6 +125,14 @@ export default function App() {
           </ProtectedRoute>
         }
       />
+      <Route
+        path="/finance"
+        element={
+          <ProtectedRoute>
+            <Finance />
+          </ProtectedRoute>
+        }
+      />
       <Route
         path="/settings"
         element={