feat(07-02): register /setup route and add first-run redirect

- /setup route as protected standalone page (outside AppLayout)
- DashboardPage redirects first-run users to /setup via useFirstRunState
- All hooks called before conditional returns (React rules of hooks)

src/App.tsx

@@ -3,6 +3,7 @@ import { useAuth } from "@/hooks/useAuth"
 import AppLayout from "@/components/AppLayout"
 import LoginPage from "@/pages/LoginPage"
 import RegisterPage from "@/pages/RegisterPage"
+import SetupPage from "@/pages/SetupPage"
 import DashboardPage from "@/pages/DashboardPage"
 import CategoriesPage from "@/pages/CategoriesPage"
 import TemplatePage from "@/pages/TemplatePage"
@@ -44,6 +45,14 @@ export default function App() {
           </PublicRoute>
         }
       />
+      <Route
+        path="/setup"
+        element={
+          <ProtectedRoute>
+            <SetupPage />
+          </ProtectedRoute>
+        }
+      />
       <Route
         element={
           <ProtectedRoute>

src/pages/DashboardPage.tsx

@@ -1,5 +1,7 @@
 import { useState, useMemo } from "react"
+import { Navigate } from "react-router-dom"
 import { useTranslation } from "react-i18next"
+import { useFirstRunState } from "@/hooks/useFirstRunState"
 import { useBudgets, useBudgetDetail } from "@/hooks/useBudgets"
 import { useMonthParam } from "@/hooks/useMonthParam"
 import type { CategoryType } from "@/lib/types"
@@ -271,6 +273,7 @@ function DashboardContent({ budgetId }: { budgetId: string }) {
 
 export default function DashboardPage() {
   const { t } = useTranslation()
+  const { isFirstRun, loading: firstRunLoading } = useFirstRunState()
   const { month } = useMonthParam()
   const { budgets, loading, createBudget, generateFromTemplate } = useBudgets()
 
@@ -286,6 +289,9 @@ export default function DashboardPage() {
 
   const [parsedYear, parsedMonth] = month.split("-").map(Number)
 
+  if (firstRunLoading) return <DashboardSkeleton />
+  if (isFirstRun) return <Navigate to="/setup" replace />
+
   return (
     <PageShell
       title={t("dashboard.title")}