Phase 4 Stage 5: pairing UX upgrades (searching + match + targeted-wait)

Searching screen: soft-prompt card reskin, pulsing-dots panel replaces
the spinner, inline 5-min timeout panel with `coba cari lagi` (resets
pairing notifier + routes to /payment/entry for a fresh funnel — the
server-side payment is failed_pairing at that point so a stale retry
isn't valid) and `kembali ke home` ghost CTA.

Bestie-found screen: S9 Match-V4 reskin — HaloOrb + status dot +
'halo, aku bestie {name}' + `mulai sesi {N} menit →` with N pulled from
the active session's duration_minutes.

Targeted-wait overlay (new) at /chat/waiting-targeted/:mitraId. Three
sub-states from pairingProvider's PairingTargetedWaitingData:
waiting (20s countdown) / accepted (routes to chat) / declined (stubbed
BestieOfflinePopup with a TODO pointing to Stage 8). Reached via
payment_screen._routeToSearchOnConfirmed when the confirm carried a
targetedMitraId — keeps the mandatory payment-before-pairing invariant.

Dev-only POST /internal/_test/force-pairing-timeout drives the 5-min
timeout shortcut for the Maestro flow without waiting live.

Maestro 05_searching_timeout.yaml + force_pairing_timeout.js helper.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

client_app/lib/router.dart

@@ -21,6 +21,7 @@ import 'features/chat/screens/no_bestie_screen.dart';
 import 'features/chat/screens/chat_screen.dart';
 import 'features/chat/screens/chat_history_screen.dart';
 import 'features/chat/screens/chat_transcript_screen.dart';
+import 'features/chat/screens/targeted_waiting_screen.dart';
 import 'features/payment/screens/payment_screen.dart';
 import 'features/payment/screens/payment_entry_screen.dart';
 import 'features/payment/screens/discount_paywall_screen.dart';
@@ -210,6 +211,15 @@ GoRouter buildRouter(Ref ref) {
         );
       }),
       GoRoute(path: '/chat/no-bestie', builder: (_, __) => const NoBestieScreen()),
+      // Phase 4 Stage 5 — targeted "Curhat lagi" 20s wait overlay. Pushed
+      // after a confirmed targeted payment session; the pairing notifier
+      // emits PairingTargetedWaitingData synchronously after the POST.
+      GoRoute(
+        path: '/chat/waiting-targeted/:mitraId',
+        builder: (context, state) => TargetedWaitingScreen(
+          mitraId: state.pathParameters['mitraId']!,
+        ),
+      ),
       GoRoute(path: '/chat/session/:sessionId', builder: (context, state) {
         final extra = state.extra;
         final mitraName = extra is String