Phase 5/6 polish: end-session flow, notif sound on API 33+, Xendit webview

Customer end-of-session (figma §6):
- PricingBottomSheet: ghost "cukup, akhiri sesi" CTA + dedup divider
- chat_screen._runEndSessionFlow chains ConfirmEndStep1 → ConfirmEndStep2
  → ClosingMessageSheet (or "lewati saja" → close + /home). The four
  popup/sheet widgets already existed; this commit just wires them
- showModalBottomSheet: showDragHandle=false to suppress the Material 3
  auto-injected handle that was stacking with our own pill

Notification sound on API 33+:
- Bump channel halobestie_chat_v1 → halobestie_chat_v2, created from
  native Kotlin in MainActivity.kt with AudioAttributes contentType
  CONTENT_TYPE_SONIFICATION. flutter_local_notifications' default of
  CONTENT_TYPE_UNKNOWN was causing Android 13 to silently drop audio
  focus while the notification still posted (isNoisy=true). Both apps
- Backend FCM payload channelId updated to v2
- AndroidManifest meta-data: default_notification_icon + color → brand
  silhouette tinted pink instead of generic Android bell. Both apps

Customer pairing reliability:
- pairing_notifier: applyPairedFromPush({sessionId, mitraName}) unsticks
  searching screen when WS push failed and FCM/active-session-poll is
  the first signal. Idempotent across PairingSearchingData,
  PairingTargetedWaitingData, PairingErrorData (covers ALREADY_ACTIVE)
- notification_service: dispatches every FCM data payload to an
  onDataMessage callback (foreground + tap + cold-start). main.dart
  wires that to applyPairedFromPush on type=='paired'. Foreground
  'paired' no longer renders a local banner — screen self-advances
- main.dart activeSession listener also calls applyPairedFromPush when
  a session appears server-side while pairing is in a waiting state.
  Covers stale ALREADY_ACTIVE recovery without a full page refresh

Auth refresh token race:
- auth_notifier._refreshFromStorage shares a single in-flight Future
  across all callers (Auth.build + 401-retry path). Backend rotates
  refresh tokens, so concurrent callers using the same stored token
  would race → loser 401s → catch wipes flutter_secure_storage → user
  appears logged out after kill+reopen

Polish:
- method_pick_screen: resizeToAvoidBottomInset=false — prevents the
  one-frame overflow when entering with the previous screen's keyboard
  still animating out
- bestie_history: BestieHistoryItem now carries `status` (backend
  already returns it). Removed _rawHistoryProvider that fetched the
  same endpoint just to read status; the two providers could go out
  of sync mid-rebuild and throw RangeError(length) on indexing

Xendit Stage 8 (carried from WIP):
- xendit_checkout_screen: embedded webview hosting Xendit's invoice
  page (intercepts halobestie:// deeplink + return-page URLs for
  deterministic pop)
- waiting_payment_screen: auto-pushes the webview when the backend
  payload includes xendit_invoice_url; spinner card + "Buka ulang
  halaman pembayaran" CTA for the QR-fallback path
- pubspec: webview_flutter ^4.13.0

Maestro infra:
- subflows/onboarding_returning_user: drop the "Mulai" carousel wait
  (splash auto-advances since 2026-05-26); tap phone-field hint
  instead of point; drop hideKeyboard (sends BACK → /home when the
  IME isn't actually up)
- New flow ts-customer-06-01-end_session_via_timeup_sheet: drives
  the full path to the chat-expired banner. Last step blocked by a
  Maestro+Flutter gesture quirk on the perpanjang ElevatedButton
  (raw `adb input tap` works at the same coords). Documented in
  memory; deeplink fixture or manual verify recommended
- ChatExpiredBanner button wrapped with Semantics(identifier:
  'chat_extend_button', button: true, onTap: …) — good hygiene for
  future tests even though it doesn't fix the dadb tap issue

.dev/: tracked wsl_emulator_bridge.ps1 + wsl_tcp_relay.py for
Maestro-on-WSL setup (Windows-side netsh portproxy + WSL-side
loopback relays). Both referenced from existing CLAUDE.md notes.

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

backend/test/services/payment.service.test.js

@@ -4,6 +4,7 @@ import {
   confirmPaymentSession,
   getPaymentSession,
   getCustomerPendingPayments,
+  xenditInvoiceMethodFromCode,
 } from '../../src/services/payment.service.js'
 import { PaymentRequestStatus, SessionStatus } from '../../src/constants.js'
 import { resetDb, resetAppConfig, db } from '../helpers/db.js'
@@ -85,6 +86,45 @@ describe('payment.service', () => {
     expect(reloaded.confirmed_at).toBeNull()
   })
 
+  // Phase 5.x — catalog payment_code → Xendit invoice paymentMethods filter.
+  // Pure function, no DB / no Xendit client touched.
+  describe('xenditInvoiceMethodFromCode', () => {
+    it('maps Virtual Account codes to bank rails', () => {
+      expect(xenditInvoiceMethodFromCode('BCA_VIRTUAL_ACCOUNT')).toBe('BCA')
+      expect(xenditInvoiceMethodFromCode('BNI_VIRTUAL_ACCOUNT')).toBe('BNI')
+      expect(xenditInvoiceMethodFromCode('MANDIRI_VIRTUAL_ACCOUNT')).toBe('MANDIRI')
+      expect(xenditInvoiceMethodFromCode('PERMATA_VIRTUAL_ACCOUNT')).toBe('PERMATA')
+      expect(xenditInvoiceMethodFromCode('BSS_VIRTUAL_ACCOUNT')).toBe('SAHABAT_SAMPOERNA')
+    })
+
+    it('maps e-wallet codes verbatim', () => {
+      expect(xenditInvoiceMethodFromCode('OVO')).toBe('OVO')
+      expect(xenditInvoiceMethodFromCode('DANA')).toBe('DANA')
+      expect(xenditInvoiceMethodFromCode('SHOPEEPAY')).toBe('SHOPEEPAY')
+    })
+
+    it('maps CARDS to CREDIT_CARD and QRIS verbatim', () => {
+      expect(xenditInvoiceMethodFromCode('CARDS')).toBe('CREDIT_CARD')
+      expect(xenditInvoiceMethodFromCode('QRIS')).toBe('QRIS')
+    })
+
+    it('is casing-tolerant', () => {
+      expect(xenditInvoiceMethodFromCode('bca_virtual_account')).toBe('BCA')
+      expect(xenditInvoiceMethodFromCode('Ovo')).toBe('OVO')
+    })
+
+    it('returns null for unknown / unsupported / falsy codes', () => {
+      // CIMB is not in Xendit's invoice paymentMethods filter list (only as a
+      // raw VA channel) — must degrade to the full-picker fallback, not throw.
+      expect(xenditInvoiceMethodFromCode('CIMB_VIRTUAL_ACCOUNT')).toBeNull()
+      expect(xenditInvoiceMethodFromCode('NOT_A_REAL_CODE')).toBeNull()
+      expect(xenditInvoiceMethodFromCode('')).toBeNull()
+      expect(xenditInvoiceMethodFromCode(null)).toBeNull()
+      expect(xenditInvoiceMethodFromCode(undefined)).toBeNull()
+      expect(xenditInvoiceMethodFromCode(42)).toBeNull()
+    })
+  })
+
   // Phase 4 Stage 10 — Chat Tab Pembayaran feed.
   describe('getCustomerPendingPayments', () => {
     it('returns empty when customer has no payments', async () => {