Phase 4 checkpoint: chat-screen perf refactor + retryable blast-failure + repo-wide dispose-ref guardrail

Chat-screen performance (customer + mitra):
- Parent screens have zero `ref.watch` — only `ref.listen` for side effects
- Body extracted into its own `ConsumerStatefulWidget`; AppBar parts split
  into narrow `.select` consumers (mode, sensitivity, timer)
- Per-second timer ticks routed to dedicated providers
  (`chatRemainingSecondsProvider` + new `mitraChatRemainingSecondsProvider`)
  so WS `session_tick` frames don't invalidate the rest of the chat state

Dispose-in-ref bug fix:
- `home_screen.dart`, `payment_screen.dart`, `mitra_chat_screen.dart` —
  ref-using cleanup moved from `dispose()` to `deactivate()`. Modern
  Riverpod invalidates `ref` the moment `dispose()` runs; the resulting
  silent error corrupts the widget-tree finalize and the next screen
  appears frozen
- `halo_lints` package added at repo root with `no_ref_in_dispose` rule
  to catch this pattern in CI / IDE analysis
- `custom_lint` activated in both apps' `analysis_options.yaml`
  (was installed but never wired in — also brings `riverpod_lint`'s
  `avoid_ref_inside_state_dispose` online)
- CLAUDE.md Pitfalls section added to client_app + mitra_app

Phase 4 §3 retryable blast-failure (Option A):
- Backend `expirePairingRequest` + all-rejected use
  `recordIntermediateFailure` instead of `failPaymentSession` so the
  payment session stays `confirmed` for re-blast
- WS `pairing_failed` payload carries `is_terminal: false` on the
  retryable paths; client parses the flag and exposes `retryBlast()`
- "Coba cari lagi" CTA on S7 Timeout now re-blasts on the same payment
- Pairing service test updated to reflect the new semantics

Customer waiting-payment screen navigation patch:
- `_navigateTerminal` uses `Future.microtask` + `addPostFrameCallback`
  redundancy after a release-mode bug where polling stopped but
  `context.go` never fired, leaving the screen visually stuck on
  "menunggu pembayaran"

See requirement/resume-2026-05-15.md for next-day pickup checklist
(mitra release rebuild + S21 Ultra install + retest is the gating item).

Bundles unrelated in-flight Phase 4 §2.x work that was already on disk
(ESP screen removal, USP one-time gate scaffolding, bestie-availability
public route, OTP service edits, Maestro flow tweaks) — kept together
to avoid a partial-rebase mess.

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

client_app/lib/features/chat/screens/searching_screen.dart

@@ -191,8 +191,14 @@ class _SearchingBody extends ConsumerWidget {
               fullWidth: true,
               size: HaloButtonSize.lg,
               onPressed: () {
-                ref.read(pairingProvider.notifier).reset();
-                context.go('/payment/entry');
+                final notifier = ref.read(pairingProvider.notifier);
+                final s = state;
+                if (s is PairingFailedData && s.isRetryable) {
+                  notifier.retryBlast();
+                } else {
+                  notifier.reset();
+                  context.go('/payment/entry');
+                }
               },
             ),
             const SizedBox(height: HaloSpacing.s8),

client_app/lib/features/chat/widgets/chat_expired_banner.dart

@@ -1,56 +1,78 @@
 import 'package:flutter/material.dart';
 import '../../../core/theme/halo_tokens.dart';
-import '../../../core/theme/widgets/halo_button.dart';
 
-/// Floating banner injected above the chat input bar when the session timer
-/// has hit zero but the session is still in `closing` grace. Phase 4 Stage 6:
-/// gives the customer a soft, in-place way to extend instead of the modal-only
-/// flow from Phase 3.
+/// Floating expired banner shown above the chat input when the session
+/// timer has hit zero but the session is still in `closing` grace.
+///
+/// Mirrors Figma `v3.jsx::HBChatExpiredBanner` (line 423): brand-pink
+/// background, white text, `⏰` icon, "habis nih... mau lanjutin curhat
+/// sama {name}?" copy, white `perpanjang` button.
 class ChatExpiredBanner extends StatelessWidget {
+  final String mitraName;
   final VoidCallback onExtend;
 
-  const ChatExpiredBanner({super.key, required this.onExtend});
+  const ChatExpiredBanner({
+    super.key,
+    required this.mitraName,
+    required this.onExtend,
+  });
 
   @override
   Widget build(BuildContext context) {
     return Container(
-      margin: const EdgeInsets.fromLTRB(
-        HaloSpacing.s12,
-        HaloSpacing.s8,
-        HaloSpacing.s12,
-        HaloSpacing.s8,
-      ),
-      padding: const EdgeInsets.fromLTRB(
-        HaloSpacing.s16,
-        HaloSpacing.s12,
-        HaloSpacing.s12,
-        HaloSpacing.s12,
-      ),
-      decoration: const BoxDecoration(
-        color: HaloTokens.danger,
-        borderRadius: HaloRadius.lg,
-        boxShadow: HaloShadows.card,
+      margin: const EdgeInsets.fromLTRB(12, 0, 12, 8),
+      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
+      decoration: BoxDecoration(
+        color: HaloTokens.brand,
+        borderRadius: BorderRadius.circular(12),
+        boxShadow: [
+          BoxShadow(
+            color: HaloTokens.brand.withValues(alpha: 0.31),
+            blurRadius: 16,
+            offset: const Offset(0, 4),
+          ),
+        ],
       ),
       child: Row(
         children: [
-          const Text('⏰', style: TextStyle(fontSize: 20)),
-          const SizedBox(width: HaloSpacing.s12),
-          const Expanded(
-            child: Text(
-              'waktu curhat habis',
-              style: TextStyle(
-                fontFamily: HaloTokens.fontBody,
-                fontSize: 14,
-                fontWeight: FontWeight.w600,
-                color: Colors.white,
+          const Text('⏰', style: TextStyle(fontSize: 16)),
+          const SizedBox(width: 10),
+          Expanded(
+            child: RichText(
+              text: TextSpan(
+                style: const TextStyle(
+                  fontFamily: HaloTokens.fontBody,
+                  fontSize: 12.5,
+                  height: 1.4,
+                  color: Colors.white,
+                ),
+                children: [
+                  const TextSpan(
+                    text: 'habis nih...',
+                    style: TextStyle(fontWeight: FontWeight.w600),
+                  ),
+                  TextSpan(text: ' mau lanjutin curhat sama $mitraName?'),
+                ],
               ),
             ),
           ),
-          HaloButton(
-            label: 'perpanjang',
-            size: HaloButtonSize.sm,
-            variant: HaloButtonVariant.secondary,
+          const SizedBox(width: 8),
+          ElevatedButton(
             onPressed: onExtend,
+            style: ElevatedButton.styleFrom(
+              backgroundColor: Colors.white,
+              foregroundColor: HaloTokens.brand,
+              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(999)),
+              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+              minimumSize: const Size(0, 32),
+              elevation: 0,
+              textStyle: const TextStyle(
+                fontFamily: HaloTokens.fontBody,
+                fontSize: 11.5,
+                fontWeight: FontWeight.w700,
+              ),
+            ),
+            child: const Text('perpanjang'),
           ),
         ],
       ),