feat(ads): home/map banner slot (hidden when removed or unloaded)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/ui/screens/home_screen.dart

@@ -5,6 +5,7 @@ import '../../game/models/season.dart';
 import '../../game/models/stage.dart';
 import '../../l10n/gen/app_localizations.dart';
 import '../../state/providers.dart';
+import '../widgets/banner_ad_slot.dart';
 import '../widgets/season_background.dart';
 import 'game_screen.dart';
 import 'season_map_screen.dart';
@@ -32,6 +33,9 @@ class HomeScreen extends ConsumerWidget {
         children: [
           const SeasonBackground(theme: SeasonTheme.fallback),
           SafeArea(
+            child: Column(
+              children: [
+                Expanded(
                   child: Center(
                     child: Column(
                       mainAxisAlignment: MainAxisAlignment.center,
@@ -111,6 +115,10 @@ class HomeScreen extends ConsumerWidget {
                     ),
                   ),
                 ),
+                const BannerAdSlot(),
+              ],
+            ),
+          ),
         ],
       ),
     );

lib/ui/screens/season_map_screen.dart

@@ -4,6 +4,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../game/models/season.dart';
 import '../../state/providers.dart';
 import '../theme/palette.dart';
+import '../widgets/banner_ad_slot.dart';
 import '../widgets/map_layout.dart';
 import '../widgets/season_background.dart';
 import '../widgets/tile_painter.dart';
@@ -74,7 +75,11 @@ class _JourneyMapState extends ConsumerState<_JourneyMap> {
 
     return Scaffold(
       backgroundColor: Colors.transparent,
-      body: Stack(
+      body: SafeArea(
+        child: Column(
+          children: [
+            Expanded(
+              child: Stack(
                 fit: StackFit.expand,
                 children: [
                   SeasonBackground(theme: pack.theme),
@@ -124,8 +129,8 @@ class _JourneyMapState extends ConsumerState<_JourneyMap> {
                     left: 0,
                     right: 0,
                     child: Container(
-              padding: EdgeInsets.only(
-                top: MediaQuery.of(context).padding.top + 6,
+                      padding: const EdgeInsets.only(
+                        top: 6,
                         bottom: 12,
                         left: 8,
                         right: 16,
@@ -169,6 +174,11 @@ class _JourneyMapState extends ConsumerState<_JourneyMap> {
                   ),
                 ],
               ),
+            ),
+            const BannerAdSlot(),
+          ],
+        ),
+      ),
     );
   }
 

lib/ui/widgets/banner_ad_slot.dart

@@ -0,0 +1,57 @@
+// lib/ui/widgets/banner_ad_slot.dart
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:google_mobile_ads/google_mobile_ads.dart';
+
+import '../../state/providers.dart';
+
+/// A self-loading 320x50 banner for the home/map screens. Renders nothing
+/// when ads are removed or the banner has not loaded — never reserves blank
+/// space and never appears on the game screen.
+class BannerAdSlot extends ConsumerStatefulWidget {
+  const BannerAdSlot({super.key});
+
+  @override
+  ConsumerState<BannerAdSlot> createState() => _BannerAdSlotState();
+}
+
+class _BannerAdSlotState extends ConsumerState<BannerAdSlot> {
+  BannerAd? _ad;
+  bool _loaded = false;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    if (_ad != null) return;
+    if (ref.read(adsRemovedProvider)) return;
+    final ad = ref.read(adServiceProvider).createBanner(
+      listener: BannerAdListener(
+        onAdLoaded: (_) {
+          if (mounted) setState(() => _loaded = true);
+        },
+        onAdFailedToLoad: (ad, _) => ad.dispose(),
+      ),
+    );
+    if (ad == null) return;
+    _ad = ad;
+  }
+
+  @override
+  void dispose() {
+    _ad?.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final ad = _ad;
+    if (ad == null || !_loaded || ref.watch(adsRemovedProvider)) {
+      return const SizedBox.shrink();
+    }
+    return SizedBox(
+      width: ad.size.width.toDouble(),
+      height: ad.size.height.toDouble(),
+      child: AdWidget(ad: ad),
+    );
+  }
+}