feat(us10): phase 13 — post-trade rating system

lib/core/app_routes.dart

@@ -12,6 +12,7 @@ import 'package:mostro/features/order/screens/take_order_screen.dart';
 import 'package:mostro/features/chat/screens/chat_room_screen.dart';
 import 'package:mostro/features/chat/screens/chat_rooms_screen.dart';
 import 'package:mostro/features/disputes/screens/dispute_chat_screen.dart';
+import 'package:mostro/features/rate/screens/rate_counterpart_screen.dart';
 import 'package:mostro/features/trades/screens/trade_detail_screen.dart';
 import 'package:mostro/features/trades/screens/trades_screen.dart';
 import 'package:mostro/features/walkthrough/providers/first_run_provider.dart';
@@ -185,8 +186,9 @@ final GoRouter appRouter = GoRouter(
     ),
     GoRoute(
       path: AppRoute.rateUser,
-      builder: (context, state) =>
-          _Stub('Rate User — ${state.pathParameters['orderId']}'),
+      builder: (context, state) => RateCounterpartScreen(
+        orderId: state.pathParameters['orderId']!,
+      ),
     ),
     GoRoute(
       path: AppRoute.disputeDetails,

lib/features/rate/screens/rate_counterpart_screen.dart

@@ -0,0 +1,176 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+
+import 'package:mostro/core/app_theme.dart';
+import 'package:mostro/features/rate/widgets/star_rating.dart';
+
+/// Rate counterpart screen — Route `/rate_user/:orderId`.
+///
+/// Prompted after trade completion:
+///   - Seller: prompted at `SettledHoldInvoice` (after releasing funds)
+///   - Buyer:  prompted at `Success` (after payment confirmed)
+///
+/// Layout:
+///   - "RATE" header label (uppercase, gray)
+///   - Green double-lightning-bolt success indicator + "Successful order" text
+///   - [StarRating] widget (5 tappable stars)
+///   - "X / 5" score display
+///   - SUBMIT button (green filled, disabled until rating > 0)
+///   - CLOSE button (green outline, skips rating)
+class RateCounterpartScreen extends ConsumerStatefulWidget {
+  const RateCounterpartScreen({super.key, required this.orderId});
+
+  final String orderId;
+
+  @override
+  ConsumerState<RateCounterpartScreen> createState() =>
+      _RateCounterpartScreenState();
+}
+
+class _RateCounterpartScreenState
+    extends ConsumerState<RateCounterpartScreen> {
+  int _rating = 0;
+  bool _isSubmitting = false;
+
+  Future<void> _submit() async {
+    if (_rating == 0) return;
+    setState(() => _isSubmitting = true);
+    try {
+      // TODO(bridge): Call reputation.submit_rating(widget.orderId, _rating)
+      // via Rust bridge once FFI bindings are generated.
+      await Future.delayed(const Duration(milliseconds: 300));
+      if (mounted) context.pop();
+    } catch (e) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('Rating failed: $e')),
+      );
+    } finally {
+      if (mounted) setState(() => _isSubmitting = false);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colors = Theme.of(context).extension<AppColors>();
+    assert(colors != null, 'AppColors theme extension must be registered');
+    if (colors == null) return const SizedBox.shrink();
+
+    final textTheme = Theme.of(context).textTheme;
+    final green = colors.mostroGreen;
+
+    return Scaffold(
+      backgroundColor: colors.backgroundDark,
+      body: SafeArea(
+        child: Padding(
+          padding: const EdgeInsets.symmetric(horizontal: AppSpacing.lg),
+          child: Column(
+            children: [
+              const SizedBox(height: AppSpacing.xl),
+
+              // ── "RATE" header ─────────────────────────────────────────
+              Text(
+                'RATE',
+                style: textTheme.labelMedium?.copyWith(
+                  color: colors.textSubtle,
+                  letterSpacing: 2,
+                  fontWeight: FontWeight.w600,
+                ),
+              ),
+
+              const SizedBox(height: AppSpacing.xl),
+
+              // ── Success indicator ─────────────────────────────────────
+              Row(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  Icon(Icons.bolt, color: green, size: 32),
+                  Icon(Icons.bolt, color: green, size: 32),
+                ],
+              ),
+              const SizedBox(height: AppSpacing.sm),
+              Text(
+                'Successful order',
+                style: textTheme.titleMedium?.copyWith(
+                  color: green,
+                  fontWeight: FontWeight.bold,
+                ),
+              ),
+
+              const SizedBox(height: AppSpacing.xl),
+
+              // ── Star rating ───────────────────────────────────────────
+              StarRating(
+                rating: _rating,
+                onChanged: (value) => setState(() => _rating = value),
+              ),
+
+              const SizedBox(height: AppSpacing.md),
+
+              // ── "X / 5" display ───────────────────────────────────────
+              Text(
+                '$_rating / 5',
+                style: textTheme.headlineSmall?.copyWith(
+                  color: colors.textPrimary,
+                  fontWeight: FontWeight.bold,
+                ),
+              ),
+
+              const Spacer(),
+
+              // ── SUBMIT button ─────────────────────────────────────────
+              FilledButton(
+                onPressed: (_rating > 0 && !_isSubmitting) ? _submit : null,
+                style: FilledButton.styleFrom(
+                  backgroundColor: green,
+                  foregroundColor: Colors.black,
+                  disabledBackgroundColor: green.withValues(alpha: 0.35),
+                  disabledForegroundColor: Colors.black54,
+                  minimumSize: const Size.fromHeight(48),
+                  shape: RoundedRectangleBorder(
+                    borderRadius: BorderRadius.circular(AppRadius.button),
+                  ),
+                ),
+                child: _isSubmitting
+                    ? const SizedBox(
+                        width: 20,
+                        height: 20,
+                        child: CircularProgressIndicator(
+                          strokeWidth: 2,
+                          color: Colors.black54,
+                        ),
+                      )
+                    : const Text(
+                        'SUBMIT',
+                        style: TextStyle(fontWeight: FontWeight.bold),
+                      ),
+              ),
+
+              const SizedBox(height: AppSpacing.sm),
+
+              // ── CLOSE button (skip rating) ────────────────────────────
+              OutlinedButton(
+                onPressed: () => context.pop(),
+                style: OutlinedButton.styleFrom(
+                  foregroundColor: green,
+                  side: BorderSide(color: green),
+                  minimumSize: const Size.fromHeight(48),
+                  shape: RoundedRectangleBorder(
+                    borderRadius: BorderRadius.circular(AppRadius.button),
+                  ),
+                ),
+                child: const Text(
+                  'CLOSE',
+                  style: TextStyle(fontWeight: FontWeight.bold),
+                ),
+              ),
+
+              const SizedBox(height: AppSpacing.lg),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/features/rate/widgets/star_rating.dart

@@ -0,0 +1,56 @@
+import 'package:flutter/material.dart';
+
+import 'package:mostro/core/app_theme.dart';
+
+/// Interactive 5-star rating selector.
+///
+/// Renders 5 tappable [Icon] widgets.  Filled stars use [AppColors.mostroGreen]
+/// (`#8CC63F`); empty stars use a dark-gray outline.  Tapping a star sets the
+/// rating to that star's index + 1 (1-based).
+///
+/// The [onChanged] callback is invoked with the new score whenever the user
+/// taps a star.  The widget is read-only when [onChanged] is null.
+class StarRating extends StatelessWidget {
+  const StarRating({
+    super.key,
+    required this.rating,
+    this.onChanged,
+    this.starSize = 40.0,
+  }) : assert(rating >= 0 && rating <= 5);
+
+  /// Current rating value (0 = none selected, 1–5 = star count).
+  final int rating;
+
+  /// Called with the new score when the user taps a star.
+  /// Pass `null` to make the widget read-only.
+  final ValueChanged<int>? onChanged;
+
+  /// Diameter of each star icon in logical pixels.
+  final double starSize;
+
+  @override
+  Widget build(BuildContext context) {
+    final colors = Theme.of(context).extension<AppColors>();
+    final filledColor = colors?.mostroGreen ?? const Color(0xFF8CC63F);
+    const emptyColor = Color(0xFF4A4A4A);
+
+    return Row(
+      mainAxisSize: MainAxisSize.min,
+      children: List.generate(5, (index) {
+        final isFilled = index < rating;
+        final starNumber = index + 1;
+        return IconButton(
+          onPressed: onChanged == null ? null : () => onChanged!(starNumber),
+          tooltip: 'Select $starNumber star${starNumber == 1 ? '' : 's'}',
+          padding: const EdgeInsets.symmetric(horizontal: 4),
+          constraints: BoxConstraints(minWidth: starSize + 8, minHeight: starSize + 8),
+          icon: Icon(
+            isFilled ? Icons.star_rounded : Icons.star_outline_rounded,
+            color: isFilled ? filledColor : emptyColor,
+            size: starSize,
+          ),
+        );
+      }),
+    );
+  }
+}

lib/features/trades/screens/trade_detail_screen.dart

@@ -35,7 +35,13 @@ enum TradeStatus {
   fiatSent('Fiat Sent'),
   completed('Completed'),
   cancelled('Cancelled'),
-  disputed('Disputed');
+  disputed('Disputed'),
+  /// Trade completed; counterpart rating prompt shown.
+  /// Maps to `Action.rate` / `Action.rateUser` from the Rust bridge.
+  pendingRating('Rate'),
+  /// Rating has been submitted (or skipped).
+  /// Maps to `Action.rateReceived` — no further actions shown.
+  rated('Rated');
 
   const TradeStatus(this.label);
   final String label;
@@ -101,6 +107,13 @@ class _TradeDetailScreenState extends ConsumerState<TradeDetailScreen> {
       return 'A dispute resolver has been assigned. '
           'They will contact you through the app.';
     }
+    if (_status == TradeStatus.pendingRating) {
+      return 'The trade completed successfully. '
+          'Rate your counterpart to help build trust in the community.';
+    }
+    if (_status == TradeStatus.rated) {
+      return 'Thank you for your rating!';
+    }
     return 'Trade in progress.';
   }
 
@@ -643,6 +656,53 @@ class _TradeDetailScreenState extends ConsumerState<TradeDetailScreen> {
               ),
             ),
           ],
+
+          // ── Pending rating — RATE + CLOSE ─────────────────────────────
+          if (_status == TradeStatus.pendingRating) ...[
+            FilledButton.icon(
+              onPressed: () =>
+                  context.push(AppRoute.rateUserPath(widget.orderId)),
+              icon: const Icon(Icons.star_outline, size: 16),
+              label: const Text('RATE'),
+              style: FilledButton.styleFrom(
+                backgroundColor: green,
+                foregroundColor: Colors.black,
+                minimumSize: const Size.fromHeight(40),
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(AppRadius.button),
+                ),
+              ),
+            ),
+            const SizedBox(height: AppSpacing.sm),
+            OutlinedButton(
+              onPressed: () => context.pop(),
+              style: OutlinedButton.styleFrom(
+                foregroundColor: green,
+                side: BorderSide(color: green),
+                minimumSize: const Size.fromHeight(40),
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(AppRadius.button),
+                ),
+              ),
+              child: const Text('CLOSE'),
+            ),
+          ],
+
+          // ── Rated — CLOSE only (no further actions) ───────────────────
+          if (_status == TradeStatus.rated) ...[
+            OutlinedButton(
+              onPressed: () => context.pop(),
+              style: OutlinedButton.styleFrom(
+                foregroundColor: green,
+                side: BorderSide(color: green),
+                minimumSize: const Size.fromHeight(40),
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(AppRadius.button),
+                ),
+              ),
+              child: const Text('CLOSE'),
+            ),
+          ],
         ],
       ),
     );

rust/src/api/mod.rs

@@ -3,6 +3,7 @@ pub mod identity;
 pub mod messages;
 pub mod nostr;
 pub mod orders;
+pub mod reputation;
 pub mod types;
 
 pub fn get_app_version() -> String {