Remove repeated demo notes from product screens (#28)

frontend/app/lib/kyc/form.dart

@@ -77,7 +77,7 @@ class IdentityForm extends StatelessWidget {
           FilledButton(
             key: const ValueKey('kyc-submit'),
             onPressed: p.canSubmit ? p.submit : null,
-            child: Text(p.isDemo ? l.kycSubmitDemo : l.kycSubmit),
+            child: Text(l.kycSubmit),
           ),
         if (p.step > 0)
           TextButton(onPressed: p.busy ? null : p.back, child: Text(l.kycBack)),

frontend/app/lib/kyc/limits.dart

@@ -47,8 +47,6 @@ class LimitsPanel extends StatelessWidget {
                 data.tier == AccountTier.basic ? l.kycBasic : l.kycVerifiedTier,
                 style: t.textTheme.titleLarge,
               ),
-              if (data.simulated)
-                Text(l.kycLimitsDemo, style: t.textTheme.bodySmall),
               const SizedBox(height: 12),
               if (data.rows.isEmpty) Text(l.kycLimitsEmpty),
               for (final row in data.rows) ...[

frontend/app/lib/kyc/page.dart

@@ -149,21 +149,6 @@ class IdentityPageState extends State<IdentityPage> {
                         ),
                         const SizedBox(height: 12),
                         Text(l.kycIntro, style: t.textTheme.bodyLarge),
-                        const SizedBox(height: 20),
-                        if (p.isDemo)
-                          Container(
-                            padding: const EdgeInsets.all(16),
-                            decoration: BoxDecoration(
-                              color: t.colorScheme.tertiaryContainer,
-                              borderRadius: BorderRadius.circular(16),
-                            ),
-                            child: Text(
-                              l.kycDemo,
-                              style: TextStyle(
-                                color: t.colorScheme.onTertiaryContainer,
-                              ),
-                            ),
-                          ),
                         const SizedBox(height: 24),
                         if (p.busy) ...[
                           const LinearProgressIndicator(),