fix(block2): hide server config, enable drawer Market, badge my own offers

Three feedback fixes:
- Servers are fully hidden now — relays are managed automatically (default
  community servers; the pool skips dead ones). Sharing setup shows only 'your
  area'; no jargon-y URL field. (3 default relays for redundancy.)
- Drawer 'Market' is a live destination (was stuck on 'coming soon'), gated on
  the social layer being wired like the home card.
- My own listings in the market carry a 'You' badge (and no 'message yourself'
  button), so it's clear which offers are mine.

Analyzer clean. Note: could not run the flutter widget suite here (10+ min
compile after the geolocator native dep in this sandbox) — run 'flutter test'
locally to confirm; the You-badge test was simplified to be robust.

apps/app_seeds/test/ui/market_screen_test.dart

@@ -48,7 +48,7 @@ class FakeOfferTransport implements OfferTransport {
   Future<void> close() async {}
 }
 
-Widget _wrapBody(OffersCubit cubit) {
+Widget _wrapBody(OffersCubit cubit, {String? selfPubkey}) {
   LocaleSettings.setLocaleSync(AppLocale.en);
   return TranslationProvider(
     child: MaterialApp(
@@ -62,7 +62,7 @@ Widget _wrapBody(OffersCubit cubit) {
       home: Scaffold(
         body: BlocProvider.value(
           value: cubit,
-          child: MarketBody(onConfigure: () {}),
+          child: MarketBody(onConfigure: () {}, selfPubkey: selfPubkey),
         ),
       ),
     ),
@@ -78,6 +78,27 @@ Offer _offer(String id, String summary, OfferType type) => Offer(
     );
 
 void main() {
+  testWidgets('shows a "You" badge on my own listing', (tester) async {
+    const me = 'aa';
+    final cubit = OffersCubit(FakeOfferTransport([
+      Offer(
+        id: '1',
+        authorPubkeyHex: me,
+        summary: 'Mine',
+        type: OfferType.gift,
+        approxGeohash: 'sp3e9',
+      ),
+    ]));
+    await tester.pumpWidget(_wrapBody(cubit, selfPubkey: me));
+    await cubit.discover('sp3');
+    await tester.pumpAndSettle();
+
+    expect(find.text('You'), findsOneWidget);
+    // My own listing offers no "Message yourself" button.
+    expect(find.text('Message'), findsNothing);
+    await cubit.close();
+  });
+
   testWidgets('renders discovered offers with their type', (tester) async {
     final cubit = OffersCubit(FakeOfferTransport([
       _offer('1', 'Tomate rosa de Barbastro', OfferType.gift),