Phase 4 Stage 2: onboarding redesign (client_app + mitra_app)

Verif Choice Sheet on display_name_screen drives the user into either
the verified or anonymous onboarding sub-flow. ESP screen (12 chips,
multi-select, info-only) + USP screen are shared between both branches;
selections persist through to chat_sessions.topics on session start.

OTP-blocked popup (HaloPopup) listens for the four real OTP-rate-limit
error codes (OTP_RATE_LIMIT_PHONE, OTP_RATE_LIMIT_IP, OTP_COOLDOWN,
OTP_ATTEMPTS_EXCEEDED) and drops the user onto the anonymous path with
ESP/USP state preserved.

Auth-providers gating replaces the --dart-define=ENABLE_SOCIAL_AUTH
build flag with server-driven discovery. authProvidersProvider preloads
GET /api/shared/auth-providers at cold start; welcome/register/
force-register screens render Google/Apple buttons only when the
backend reports enabled:true. Falls back to phone-OTP-only when both
providers are off. social_auth_enabled.dart deleted; client_app/CLAUDE.md
updated to reflect the new gating contract.

Mitra app: chat screen renders an ESP chip strip above the first message
bubble when chat_sessions.topics is non-empty.

Backend session.service.js getSessionById SELECTs cs.topics so the mitra
side can read the customer's selected topics.

Maestro flows 02_onboarding_verified.yaml + 03_onboarding_anon.yaml.

Deviation from plan: plan referenced OTP error code 'otp_retry_exhausted';
real codes are OTP_RATE_LIMIT_*/OTP_COOLDOWN/OTP_ATTEMPTS_EXCEEDED -
popup listens for all four. Plan said 'has_paid_first_session'; live
endpoint returns 'has_consulted_before' - used the live field.

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

client_app/.maestro/flows/03_onboarding_anon.yaml

@@ -0,0 +1,71 @@
+# Phase 4 Stage 2 — anonymous onboarding path:
+#   Splash → onboarding carousel → Welcome → Display Name → Verif Choice Sheet
+#   (curhat anonim) → ESP → USP → arrival at /payment/method-pick (Stage 3
+#   owns the screen body; this flow stops at route arrival).
+#
+# Run:
+#   maestro test client_app/.maestro/flows/03_onboarding_anon.yaml
+#
+# Pre-reqs: same as 02_onboarding_verified.yaml.
+#
+# NOTE: numeric prefix conflicts with the existing 03_payment_to_chat_happy.yaml
+# — Stage 9 will reorganize the flow directory once the full Phase 4 suite lands.
+appId: com.halobestie.client.client_app
+---
+- launchApp:
+    clearState: true
+- extendedWaitUntil:
+    visible:
+      text: "Mulai"
+    timeout: 15000
+- tapOn:
+    text: "Mulai"
+    retryTapIfNoChange: true
+- extendedWaitUntil:
+    visible:
+      text: "Lanjut sebagai Tamu"
+    timeout: 10000
+- tapOn:
+    text: "Lanjut sebagai Tamu"
+    retryTapIfNoChange: true
+- extendedWaitUntil:
+    visible:
+      text: "Nama panggilan"
+    timeout: 10000
+- tapOn:
+    text: "Nama panggilan"
+- inputText: "Maestro"
+- hideKeyboard
+- tapOn:
+    text: "lanjut"
+    retryTapIfNoChange: true
+# Verif Choice Sheet — pick anonymous branch
+- extendedWaitUntil:
+    visible:
+      text: "curhat anonim"
+    timeout: 10000
+- tapOn:
+    text: "curhat anonim"
+    retryTapIfNoChange: true
+# ESP screen — leave empty + tap lewati to exercise the skip path
+- extendedWaitUntil:
+    visible:
+      text: "Lagi mikirin apa?"
+    timeout: 10000
+- tapOn:
+    text: "lewati"
+    retryTapIfNoChange: true
+# USP screen
+- extendedWaitUntil:
+    visible:
+      text: "Sebelum mulai"
+    timeout: 10000
+- tapOn:
+    text: "aku ngerti, lanjut"
+    retryTapIfNoChange: true
+# Stage 3 owns /payment/method-pick — arrival is the success signal.
+- extendedWaitUntil:
+    visible:
+      text: "Sebelum mulai"
+    timeout: 10000
+    notVisible: true