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/lib/ui/market_screen.dart

@@ -228,11 +228,11 @@ class MarketBody extends StatelessWidget {
           separatorBuilder: (_, _) => const SizedBox(height: 12),
           itemBuilder: (context, i) {
             final o = state.offers[i];
+            final mine = o.authorPubkeyHex == selfPubkey;
             return _OfferCard(
               offer: o,
-              onContact: o.authorPubkeyHex == selfPubkey
-                  ? null
-                  : () => context.go('/chat/${o.authorPubkeyHex}'),
+              mine: mine,
+              onContact: mine ? null : () => context.go('/chat/${o.authorPubkeyHex}'),
             );
           },
         );
@@ -244,10 +244,13 @@ class MarketBody extends StatelessWidget {
 /// One discovered offer. Human words for the reciprocity mode; coarse "near you"
 /// instead of any precise location; price only when it's a sale.
 class _OfferCard extends StatelessWidget {
-  const _OfferCard({required this.offer, this.onContact});
+  const _OfferCard({required this.offer, this.mine = false, this.onContact});
 
   final Offer offer;
 
+  /// Whether this is the current user's own listing (shown with a "You" badge).
+  final bool mine;
+
   /// Opens a private chat with the author; null for our own listings.
   final VoidCallback? onContact;
 
@@ -276,6 +279,24 @@ class _OfferCard extends StatelessWidget {
                   ),
                 ),
               ),
+              if (mine) ...[
+                Container(
+                  padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
+                  decoration: BoxDecoration(
+                    color: seedGreen,
+                    borderRadius: BorderRadius.circular(20),
+                  ),
+                  child: Text(
+                    t.market.mine,
+                    style: const TextStyle(
+                      color: Colors.white,
+                      fontSize: 11,
+                      fontWeight: FontWeight.w700,
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 6),
+              ],
               _TypeChip(label: _offerTypeLabel(t, offer.type)),
             ],
           ),
@@ -408,8 +429,6 @@ class _ConfigSheet extends StatefulWidget {
 
 class _ConfigSheetState extends State<_ConfigSheet> {
   final _area = TextEditingController();
-  final _servers = TextEditingController();
-  final Set<String> _selectedRelays = {};
   bool _loading = true;
   bool _locationBusy = false;
   String? _locationError;
@@ -422,22 +441,13 @@ class _ConfigSheetState extends State<_ConfigSheet> {
 
   Future<void> _load() async {
     _area.text = await widget.settings.areaGeohash();
-    final current = await widget.settings.relayUrls();
-    final presetUrls = SocialSettings.presets.map((p) => p.url).toSet();
-    _selectedRelays
-      ..clear()
-      ..addAll(current.where(presetUrls.contains));
-    // Any relays that aren't presets go in the "add another" field.
-    _servers.text = current.where((u) => !presetUrls.contains(u)).join('\n');
     if (mounted) setState(() => _loading = false);
   }
 
   Future<void> _save() async {
+    // Relays are managed automatically (default community servers, dead ones
+    // skipped by the pool) — the user only sets their area here.
     await widget.settings.setAreaGeohash(_area.text);
-    await widget.settings.setRelayUrls([
-      ..._selectedRelays,
-      ..._servers.text.split('\n'),
-    ]);
     if (mounted) Navigator.of(context).pop(true);
   }
 
@@ -465,7 +475,6 @@ class _ConfigSheetState extends State<_ConfigSheet> {
   @override
   void dispose() {
     _area.dispose();
-    _servers.dispose();
     super.dispose();
   }
 
@@ -533,64 +542,6 @@ class _ConfigSheetState extends State<_ConfigSheet> {
                       style: const TextStyle(color: Color(0xFFB3261E), fontSize: 12),
                     ),
                   ),
-                const SizedBox(height: 16),
-                // Pick from a short list of shared servers — pre-selected so it
-                // works out of the box; no jargon-y blank field to puzzle over.
-                Text(
-                  t.market.serversLabel,
-                  style: const TextStyle(
-                    fontSize: 14,
-                    fontWeight: FontWeight.w600,
-                    color: seedOnSurface,
-                  ),
-                ),
-                Text(
-                  t.market.serversHelp,
-                  style: const TextStyle(color: seedMuted, fontSize: 12, height: 1.3),
-                ),
-                for (final preset in SocialSettings.presets)
-                  CheckboxListTile(
-                    key: Key('market.relay.${preset.name}'),
-                    contentPadding: EdgeInsets.zero,
-                    dense: true,
-                    controlAffinity: ListTileControlAffinity.leading,
-                    value: _selectedRelays.contains(preset.url),
-                    title: Text(preset.name),
-                    subtitle: Text(preset.url,
-                        style: const TextStyle(fontSize: 11, color: seedMuted)),
-                    onChanged: (checked) => setState(() {
-                      if (checked ?? false) {
-                        _selectedRelays.add(preset.url);
-                      } else {
-                        _selectedRelays.remove(preset.url);
-                      }
-                    }),
-                  ),
-                // A rarely-needed escape hatch for a community's own server.
-                Theme(
-                  data: Theme.of(context)
-                      .copyWith(dividerColor: Colors.transparent),
-                  child: ExpansionTile(
-                    key: const Key('market.serversAdvanced'),
-                    tilePadding: EdgeInsets.zero,
-                    childrenPadding: const EdgeInsets.only(bottom: 8),
-                    title: Text(
-                      t.market.serversAdvanced,
-                      style: const TextStyle(fontSize: 13, color: seedMuted),
-                    ),
-                    children: [
-                      TextField(
-                        key: const Key('market.servers'),
-                        controller: _servers,
-                        minLines: 1,
-                        maxLines: 3,
-                        decoration: const InputDecoration(
-                          hintText: 'wss://…',
-                        ),
-                      ),
-                    ],
-                  ),
-                ),
                 const SizedBox(height: 20),
                 FilledButton(
                   key: const Key('market.save'),