Phase 4 Stage 8: returning-user shell + Tanya Admin sheet

Bestie Choice Sheet on home Mulai Curhat CTA. When the user has at
least one prior session (bestieHistoryHasItemsProvider hits the chat-
sessions history endpoint), the CTA opens a HaloBottomSheet with two
cards: 'bestie yang udah kenal' -> /chat/history, 'bestie baru' ->
/payment/entry. Empty history -> direct to /payment/entry.

Bestie history list visual upgrade: HaloOrb (mitraId seed) + name +
last-session date + topic pills + sessions count + ONLINE pill.
Backend getCustomerHistory now returns topics, mitra_is_online,
sessions_count in a single payload (no per-row presence round-trip).

BestieOfflinePopup with two variants (returning | new_) replacing the
legacy BestieUnavailableDialog. tanya admin ghost CTA on both variants
opens the new TanyaAdminSheet. Stage 5's targeted-wait declined stub
+ Stage 7's chat-screen 409 stub + searching-screen call site all
migrated to the real component.

TanyaAdminSheet: HaloBottomSheet with WA + Telegram buttons, deeplinks
fetched via supportHandlesProvider (CC-config-driven). url_launcher
added to client_app; ios LSApplicationQueriesSchemes covers
https/http/whatsapp/tg.

Stage 2's OTP-blocked popup hubungi admin SnackBar stub also migrated
to TanyaAdminSheet.

Dev-only POST /internal/_test/seed-history-session lets Maestro 08
flow seed a history row before exercising the choice sheet.

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

client_app/lib/features/home/widgets/bestie_choice_sheet.dart

@@ -0,0 +1,141 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import '../../../core/theme/halo_tokens.dart';
+import '../../../core/theme/widgets/widgets.dart';
+
+/// Phase 4 Stage 8 — Bestie Choice Sheet.
+///
+/// Triggered from the home `Mulai Curhat` CTA when the user has at least one
+/// prior session. Two cards: continue with a known bestie (→ history list)
+/// vs. find a new bestie (→ soft-prompt + blast).
+class BestieChoiceSheet extends StatelessWidget {
+  const BestieChoiceSheet({super.key});
+
+  static Future<void> show(BuildContext context) {
+    return HaloBottomSheet.show<void>(
+      context,
+      child: const BestieChoiceSheet(),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: CrossAxisAlignment.stretch,
+      children: [
+        const Text(
+          'mau curhat sama siapa?',
+          textAlign: TextAlign.center,
+          style: TextStyle(
+            fontFamily: HaloTokens.fontDisplay,
+            fontSize: 22,
+            fontWeight: FontWeight.w700,
+            color: HaloTokens.ink,
+          ),
+        ),
+        const SizedBox(height: HaloSpacing.s8),
+        const Text(
+          'pilih lanjut sama bestie yang udah kenal, atau coba bestie baru.',
+          textAlign: TextAlign.center,
+          style: TextStyle(
+            fontFamily: HaloTokens.fontBody,
+            fontSize: 14,
+            color: HaloTokens.inkSoft,
+          ),
+        ),
+        const SizedBox(height: HaloSpacing.s24),
+        _ChoiceCard(
+          title: 'bestie yang udah kenal',
+          subtitle: 'lanjut cerita ke bestie yang pernah dengerin kamu.',
+          icon: Icons.favorite_outline,
+          onTap: () {
+            Navigator.of(context).pop();
+            context.push('/chat/history');
+          },
+        ),
+        const SizedBox(height: HaloSpacing.s12),
+        _ChoiceCard(
+          title: 'bestie baru',
+          subtitle: 'cari bestie baru yang siap dengerin sekarang.',
+          icon: Icons.auto_awesome_outlined,
+          onTap: () {
+            Navigator.of(context).pop();
+            context.push('/payment/entry');
+          },
+        ),
+      ],
+    );
+  }
+}
+
+class _ChoiceCard extends StatelessWidget {
+  final String title;
+  final String subtitle;
+  final IconData icon;
+  final VoidCallback onTap;
+
+  const _ChoiceCard({
+    required this.title,
+    required this.subtitle,
+    required this.icon,
+    required this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Material(
+      color: HaloTokens.brandSofter,
+      borderRadius: HaloRadius.lg,
+      child: InkWell(
+        onTap: onTap,
+        borderRadius: HaloRadius.lg,
+        child: Padding(
+          padding: const EdgeInsets.all(HaloSpacing.s16),
+          child: Row(
+            children: [
+              Container(
+                width: 48,
+                height: 48,
+                decoration: const BoxDecoration(
+                  color: HaloTokens.brandSoft,
+                  shape: BoxShape.circle,
+                ),
+                alignment: Alignment.center,
+                child: Icon(icon, color: HaloTokens.brandDark, size: 24),
+              ),
+              const SizedBox(width: HaloSpacing.s12),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      title,
+                      style: const TextStyle(
+                        fontFamily: HaloTokens.fontDisplay,
+                        fontSize: 16,
+                        fontWeight: FontWeight.w700,
+                        color: HaloTokens.ink,
+                      ),
+                    ),
+                    const SizedBox(height: 2),
+                    Text(
+                      subtitle,
+                      style: const TextStyle(
+                        fontFamily: HaloTokens.fontBody,
+                        fontSize: 13,
+                        height: 18 / 13,
+                        color: HaloTokens.inkSoft,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+              const Icon(Icons.chevron_right, color: HaloTokens.brandDark),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}