chore(audience-sample): remove page() button from sample app (SDK-314)

The button called Track("screen_viewed") via a custom event — not a
dedicated SDK Page API — and sat awkwardly alongside Init/Teardown
controls. Studios can replicate the pattern from the Typed Events tab
using a custom Track call.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nattb8

examples/audience/Assets/SampleApp/Resources/AudienceSample.uxml

@@ -125,11 +125,6 @@
                         <ui:VisualElement class="actions last">
                             <ui:Button name="btn-init" text="Init" />
 
-                            <ui:Button name="btn-page" class="with-sig">
-                                <ui:Label class="btn-label" text="Page" />
-                                <ui:Label class="btn-sig" text="page()" />
-                            </ui:Button>
-
                             <ui:Button name="btn-flush" class="with-sig">
                                 <ui:Label class="btn-label" text="Flush" />
                                 <ui:Label class="btn-sig" text="flush()" />

examples/audience/Assets/SampleApp/Scripts/AudienceSample.UI.cs

@@ -53,7 +53,7 @@ private static readonly (string TabId, string PanelId)[] Tabs =
         private TextField _publishableKey, _baseUrl, _flushInterval, _flushSize;
         private DropdownField _initialConsent;
         private Toggle _debug;
-        private Button _btnInit, _btnPage, _btnFlush, _btnReset, _btnShutdown, _btnDeleteData;
+        private Button _btnInit, _btnFlush, _btnReset, _btnShutdown, _btnDeleteData;
 
         // ---- UXML element fields (Consent tab) ----
 
@@ -195,7 +195,7 @@ private void BindElements()
             _flushInterval = Require<TextField>("flush-interval");
             _flushSize     = Require<TextField>("flush-size");
             _btnInit       = Require<Button>("btn-init");
-            _btnPage       = Require<Button>("btn-page");
+
             _btnFlush      = Require<Button>("btn-flush");
             _btnReset      = Require<Button>("btn-reset");
             _btnShutdown   = Require<Button>("btn-shutdown");
@@ -304,7 +304,7 @@ private void RegisterHandlers()
             _baseUrl.RegisterValueChangedCallback(_ => RefreshStatusBar());
 
             _btnInit.clicked += OnInit;
-            _btnPage.clicked += OnPage;
+
             _btnFlush.clicked += async () => await OnFlushAsync();
             _btnReset.clicked += OnReset;
             _btnShutdown.clicked += OnShutdown;
@@ -614,7 +614,7 @@ private void RefreshConsentPills()
 
         private void RefreshInitState()
         {
-            foreach (var b in new[] { _btnPage, _btnFlush, _btnReset, _btnShutdown, _btnDeleteData, _btnCustomEvent, _btnIdentify, _btnIdentifyTraits })
+            foreach (var b in new[] { _btnFlush, _btnReset, _btnShutdown, _btnDeleteData, _btnCustomEvent, _btnIdentify, _btnIdentifyTraits })
                 b.SetEnabled(_initialised);
             foreach (var p in _consentPills.Values) p.SetEnabled(_initialised);
             foreach (var btn in _typedEventsHost.Query<Button>().ToList()) btn.SetEnabled(_initialised);

examples/audience/Assets/SampleApp/Scripts/AudienceSample.cs

@@ -4,7 +4,6 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using UnityEngine;
-using UnityEngine.SceneManagement;
 using UnityEngine.UIElements;
 
 namespace Immutable.Audience.Samples.SampleApp
@@ -104,17 +103,6 @@ private async Task OnDeleteDataAsync()
 
         // ---- SDK action handlers: telemetry ----
 
-        // v1 has no typed Screen API; Plan §10 specifies a custom Track call
-        // as the studio-facing pattern for scene coverage. Demo follows that.
-        private void OnPage() => RunAndLog("page()", () =>
-        {
-            GuardConsentForTrack();
-            var screen = SceneManager.GetActiveScene().name;
-            var props = new Dictionary<string, object> { ["path"] = screen };
-            ImmutableAudience.Track("screen_viewed", props);
-            return Json.Serialize(props, 2);
-        });
-
         // Prefers the typed overload for the four events with public C#
         // classes (Progression, Resource, Purchase, MilestoneReached); the
         // rest stay on the string overload. Typed validation errors are