Client Profile: save-phone banner for anonymous users

Anonymous customers now see a brand-gradient "Simpan Nomor HP" panel
above the user card on the kamu tab, ported from the Figma SProfile
save-phone banner. Tapping it pushes /auth/register?from=profile, which
hides the "lanjut tanpa verifikasi (harga normal)" link — a user who
re-entered the verif funnel from Profile shouldn't be re-offered the
anon exit. Spec §1.3 added documenting the ?from= entry-point
convention.

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

client_app/lib/features/auth/screens/register_screen.dart

@@ -123,6 +123,12 @@ class _RegisterScreenState extends ConsumerState<RegisterScreen> {
     final name = _greetingName(authState.valueOrNull);
     final shownName = name.isEmpty ? 'kamu' : name;
 
+    // When the user arrives via the Profile "Simpan Nomor HP" CTA they've
+    // already committed to identifying — drop the anonymous escape hatch so
+    // there's only one way forward.
+    final fromProfile =
+        GoRouterState.of(context).uri.queryParameters['from'] == 'profile';
+
     return Scaffold(
       backgroundColor: HaloTokens.bg,
       body: SafeArea(
@@ -207,27 +213,29 @@ class _RegisterScreenState extends ConsumerState<RegisterScreen> {
                         ref.read(authProvider.notifier).requestOtp(_e164Phone())
                     : null,
               ),
-              const SizedBox(height: 4),
-              TextButton(
-                onPressed: isLoading
-                    ? null
-                    // Skip ESPb/USPb — the verified branch already ran ESPa+USPa,
-                    // so the redirect alias drops the user straight at PickMethod.
-                    : () => context.go('/onboarding/anon/method'),
-                style: TextButton.styleFrom(
-                  foregroundColor: HaloTokens.inkSoft,
-                  minimumSize: const Size(0, 40),
-                ),
-                child: const Text(
-                  'lanjut tanpa verifikasi (harga normal)',
-                  style: TextStyle(
-                    fontFamily: HaloTokens.fontBody,
-                    fontSize: 12.5,
-                    decoration: TextDecoration.underline,
-                    decorationColor: HaloTokens.inkSoft,
+              if (!fromProfile) ...[
+                const SizedBox(height: 4),
+                TextButton(
+                  onPressed: isLoading
+                      ? null
+                      // Skip ESPb/USPb — the verified branch already ran ESPa+USPa,
+                      // so the redirect alias drops the user straight at PickMethod.
+                      : () => context.go('/onboarding/anon/method'),
+                  style: TextButton.styleFrom(
+                    foregroundColor: HaloTokens.inkSoft,
+                    minimumSize: const Size(0, 40),
+                  ),
+                  child: const Text(
+                    'lanjut tanpa verifikasi (harga normal)',
+                    style: TextStyle(
+                      fontFamily: HaloTokens.fontBody,
+                      fontSize: 12.5,
+                      decoration: TextDecoration.underline,
+                      decorationColor: HaloTokens.inkSoft,
+                    ),
                   ),
                 ),
-              ),
+              ],
             ],
           ),
         ),