refactor(routing): drop now-redundant per-route ErrorBoundary wrappers

Six routes were wrapped in <ErrorBoundary level='app'> around LazyPage.
After the previous commit moved a level='page' boundary inside LazyPage,
the outer 'app' boundary became unreachable — the inner one catches
first.

Strip the dead wrappers (PurchaseSuccess, QuickPurchase, AutoLogin,
TopUpResult, GiftSubscription, GiftResult). Behavior is identical, the
route blocks are 25 fewer lines, and there's only one boundary to
reason about per route.

src/App.tsx

@@ -271,31 +271,25 @@ function App() {
         <Route
           path="/buy/success/:token"
           element={
-            <ErrorBoundary level="app">
             <LazyPage>
               <PurchaseSuccess />
             </LazyPage>
-            </ErrorBoundary>
           }
         />
         <Route
           path="/buy/:slug"
           element={
-            <ErrorBoundary level="app">
             <LazyPage>
               <QuickPurchase />
             </LazyPage>
-            </ErrorBoundary>
           }
         />
         <Route
           path="/auto-login"
           element={
-            <ErrorBoundary level="app">
             <LazyPage>
               <AutoLogin />
             </LazyPage>
-            </ErrorBoundary>
           }
         />
 
@@ -394,11 +388,9 @@ function App() {
           path="/balance/top-up/result"
           element={
             <ProtectedRoute withLayout={false}>
-              <ErrorBoundary level="app">
               <LazyPage>
                 <TopUpResult />
               </LazyPage>
-              </ErrorBoundary>
             </ProtectedRoute>
           }
         />
@@ -525,25 +517,21 @@ function App() {
         <Route
           path="/gift"
           element={
-            <ErrorBoundary level="app">
             <ProtectedRoute>
               <LazyPage>
                 <GiftSubscription />
               </LazyPage>
             </ProtectedRoute>
-            </ErrorBoundary>
           }
         />
         <Route
           path="/gift/result"
           element={
-            <ErrorBoundary level="app">
             <ProtectedRoute>
               <LazyPage>
                 <GiftResult />
               </LazyPage>
             </ProtectedRoute>
-            </ErrorBoundary>
           }
         />
         <Route