fix(block2): clearer market states — 'can't reach servers' (retry) vs 'set your area'

Feedback: the market sometimes looked 'disabled'. Now the offline/empty states
are distinct and honest:
- No working relay (defaults exist, so it's a reachability issue) → 'Can't reach
  the community servers right now' + a Retry.
- Online but no area set → 'Set your area' prompt (you'd otherwise see a bare
  'nothing nearby').
- Area set + nothing found → the existing empty state.

i18n en/es/pt; offline tests updated; analyzer clean.

apps/app_seeds/lib/ui/market_screen.dart

@@ -42,6 +42,7 @@ class MarketScreen extends StatefulWidget {
 class _MarketScreenState extends State<MarketScreen> {
   OffersCubit? _cubit;
   bool _loading = true;
+  bool _hasArea = false;
 
   @override
   void initState() {
@@ -64,6 +65,7 @@ class _MarketScreenState extends State<MarketScreen> {
     final previous = _cubit;
     setState(() {
       _cubit = cubit;
+      _hasArea = area.isNotEmpty;
       _loading = false;
     });
     await previous?.close();
@@ -171,6 +173,8 @@ class _MarketScreenState extends State<MarketScreen> {
               value: cubit,
               child: MarketBody(
                 onConfigure: _openConfig,
+                onRetry: _init,
+                hasArea: _hasArea,
                 selfPubkey: widget.social.publicKeyHex,
               ),
             ),
@@ -181,12 +185,20 @@ class _MarketScreenState extends State<MarketScreen> {
 class MarketBody extends StatelessWidget {
   const MarketBody({
     required this.onConfigure,
+    this.onRetry,
+    this.hasArea = true,
     this.selfPubkey,
     super.key,
   });
 
   final VoidCallback onConfigure;
 
+  /// Re-opens the connection (for the "can't reach servers" retry).
+  final VoidCallback? onRetry;
+
+  /// Whether the user has set their coarse area yet.
+  final bool hasArea;
+
   /// This user's own pubkey, so we don't offer to message our own listings.
   final String? selfPubkey;
 
@@ -196,10 +208,21 @@ class MarketBody extends StatelessWidget {
     return BlocBuilder<OffersCubit, OffersState>(
       builder: (context, state) {
         if (!context.read<OffersCubit>().isOnline) {
+          // Default community servers exist, so "offline" means unreachable —
+          // offer a retry rather than "set up sharing".
           return _EmptyState(
             icon: Icons.wifi_tethering_off_outlined,
-            title: t.market.notSetUp,
-            body: t.market.notSetUpBody,
+            title: t.market.cantReach,
+            body: t.market.cantReachBody,
+            actionLabel: onRetry != null ? t.market.retry : null,
+            onAction: onRetry,
+          );
+        }
+        if (!hasArea) {
+          return _EmptyState(
+            icon: Icons.place_outlined,
+            title: t.market.setArea,
+            body: t.market.setAreaBody,
             actionLabel: t.market.setUp,
             onAction: onConfigure,
           );