Mitra Bestie §1–§3: shell + Undangan + popup + chat polish

Brings the mitra app to figma-bestie parity for Home (§1), Undangan
inbox with Curhat Baru + Perpanjang tabs (§2), and the incoming-popup
+ active-chat flow (§3). Home now lives inside a StatefulShellRoute
with BestieTabBar so Profil + Undangan + Home share one shell.

- Shell: features/shell/ (StatefulShellRoute, BestieTabBar, 3 branches)
- Undangan: features/undangan/ — Curhat Baru reads
  chatRequestProvider.pendingInvites; row Terima delegates accept to
  the notifier and ChatRequestOverlay owns nav (no double-push).
  Perpanjang tab stubbed (empty state) until backend exposes
  pendingExtensionsProvider.
- Profil: features/profile/ — Bestie-styled stub
- Home: refactored to body-only (shell owns chrome)
- Popup: chat_request_overlay + chat_request_notifier updated to
  serve the list rows, not just the modal
- Chat: mitra_chat_screen polish
- Theme: accentAmber tokens for the Perpanjang tab + halo_orb widget
  (loading spinner used by undangan list states)
- Login: replace broken GoRouterState location guard with
  _expectOtpPush flag — was stacking duplicate /otp pages on OTP
  resend (see project-otp-nav-bug-fixed-2026-05-21)

Maestro:
- 17 new flows under .maestro/flows/ts-mitra-{1,2,3}-* covering home
  online/offline variants, undangan empty/populated/tolak states,
  popup curhat-baru → accept → chat → ended banner, plus popup
  dismiss/expire/cancelled edge cases
- 4 new §A OTP flows (07/08/09/10) for invalid/mismatch/expired/cooldown
- Helper scripts: force_mitra_online/offline, force_pairing_timeout,
  force_session_expires_at, delete_mitra_status_row,
  customer_blast_now (js), customer_cancel_latest_blast
- Backend: POST /internal/_test/delete-mitra-status-row supports the
  "fresh mitra with no status row" test setup

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

mitra_app/.maestro/flows/README_section_A.md

@@ -12,7 +12,7 @@ Tests use the naming convention `ts-mitra-<section>-<sub>-<description>.yaml`:
 | File | Branch (spec ref) | Expected destination |
 |---|---|---|
 | `ts-mitra-A-01-phone_invalid_inline_error.yaml` | §A.1 local CTA gate for short phones | "kirim kode" disabled for <9 subscriber digits, enables + navigates on valid input |
-| `ts-mitra-A-03-success_login_to_home.yaml` | §A.2 200 + `is_active=true` | `/home` (active sessions tab) |
+| `ts-mitra-A-03-success_login_to_home.yaml` | §A.2 200 + `is_active=true` | `/home` (BestieHome online; asserts "Kamu lagi ONLINE" — Stage 2 removed the Sesi Aktif / Riwayat Chat tiles) |
 | `ts-mitra-A-04-account_inactive_screen.yaml` | §A.2 200 + `is_active=false` → 403 `ACCOUNT_INACTIVE` | `/auth/inactive` (AppBar back arrow omitted; system-back interception deferred) |
 | `ts-mitra-A-05-phone_format_variants.yaml` | §A.1 phone-format normalization | 5 variants (`8…`, `08…`, `628…`, `+628…`, `0628…`) all reach S3b with `+628200000501` shown |
 | `ts-mitra-A-06-back_to_login_and_retry.yaml` | §A.1 regression — back from S3b + re-submit | Second "kirim kode" tap still navigates to S3b after returning to S3a |
@@ -39,6 +39,10 @@ interference:
 - A-04 → `+628200000401`
 - A-05 → `+628200000501` (one phone, 5 input formats)
 - A-06 → `+628200000601`
+- §1 Home (ts-mitra-1-*) → `+62820000070{1..3}`
+- §2 Undangan (ts-mitra-2-*) → `+62820000080{1..2}` (2-03 piggybacks on a
+  pre-signed-in device, no fresh OTP)
+- §3 Popup + Chat (ts-mitra-3-*) → `+62820000090{1..4}`
 
 If the same phone gets used across multiple flows in one run, the per-IP
 rate-limit (10 OTP requests / hour, default) can trip and break A-03 or A-04