feat(market): one-time community-rules gate before joining the market, publishing or messaging

apps/app_seeds/lib/ui/market_screen.dart

@@ -11,9 +11,11 @@ import '../services/offer_outbox.dart';
 import '../services/social_connection.dart';
 import '../services/social_service.dart';
 import '../services/social_settings.dart';
+import '../services/onboarding_store.dart';
 import '../state/offers_cubit.dart';
 import 'edge_fade.dart';
 import 'filter_chips.dart';
+import 'market_gate.dart';
 import 'market_widgets.dart';
 import 'theme.dart';
 
@@ -27,12 +29,18 @@ class MarketScreen extends StatefulWidget {
     required this.connection,
     this.location,
     this.outbox,
+    this.onboarding,
     super.key,
   });
 
   final SocialService social;
   final SocialSettings settings;
 
+  /// When set, joining the market is gated on a one-time acceptance of the
+  /// community rules (store UGC policies require it before content is
+  /// created). Null in tests → no gate.
+  final OnboardingStore? onboarding;
+
   /// The shared relay connection (one per identity), reused for discovery.
   final SocialConnection connection;
 
@@ -56,7 +64,24 @@ class _MarketScreenState extends State<MarketScreen> {
   @override
   void initState() {
     super.initState();
-    _init();
+    _start();
+  }
+
+  /// Runs the one-time community-rules gate (when wired) before touching the
+  /// network; declining leaves the market.
+  Future<void> _start() async {
+    final store = widget.onboarding;
+    if (store != null && !await store.marketRulesAccepted()) {
+      // Wait for the first frame so the sheet has a surface to attach to.
+      await WidgetsBinding.instance.endOfFrame;
+      if (!mounted) return;
+      final ok = await ensureMarketRulesAccepted(context, store);
+      if (!ok) {
+        if (mounted) context.pop();
+        return;
+      }
+    }
+    await _init();
   }
 
   Future<void> _init() async {
@@ -111,6 +136,13 @@ class _MarketScreenState extends State<MarketScreen> {
   /// Publishes the user's shared lots as offers to the network, tagged with the
   /// coarse area. Prompts for setup when the area isn't set.
   Future<void> _shareMine() async {
+    // Defense in depth: publishing is what actually creates content, so the
+    // rules gate is re-checked here even though market entry already ran it.
+    final store = widget.onboarding;
+    if (store != null) {
+      final ok = await ensureMarketRulesAccepted(context, store);
+      if (!ok || !mounted) return;
+    }
     final cubit = _cubit;
     if (cubit == null) return;
     final repo = context.read<VarietyRepository>();