Demo: add sandbox buttons for trackConversion smoke testing

Adds two buttons on the First tab — "Track Pageview (sandbox)" and
"Track Conversion (sandbox)" — that fire against the
`sandbox.joshhanson.io` apikey on a shared test URL. The pageview lets a
session accrue history before the conversion fires so the conversions
topology has something to attribute to.

Used during the manual end-to-end verification of trackConversion: with
Proxyman attached, confirm action=conversion and the _conversion_type /
_conversion_label keys land in the on-wire payload, then watch
dash.parsely.com for the conversion in the conversions report.

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

Author: randyriback

Demo/ParselyDemo/Base.lproj/Main.storyboard

@@ -66,6 +66,26 @@
                                             <action selector="didPauseVideo:" destination="9pv-A4-QxB" eventType="primaryActionTriggered" id="TbX-BH-W7q"/>
                                         </connections>
                                     </button>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Sandbox" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="rrx-sb-lbl">
+                                        <rect key="frame" x="0.0" y="226" width="125" height="20"/>
+                                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                        <nil key="textColor"/>
+                                        <nil key="highlightedColor"/>
+                                    </label>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="rrx-sb-pgv">
+                                        <rect key="frame" x="0.0" y="251" width="125" height="30"/>
+                                        <state key="normal" title="Track Pageview (sandbox)"/>
+                                        <connections>
+                                            <action selector="didTouchSandboxPageview:" destination="9pv-A4-QxB" eventType="primaryActionTriggered" id="rrx-sb-pv1"/>
+                                        </connections>
+                                    </button>
+                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="rrx-sb-cnv">
+                                        <rect key="frame" x="0.0" y="286" width="125" height="30"/>
+                                        <state key="normal" title="Track Conversion v2 (sandbox)"/>
+                                        <connections>
+                                            <action selector="didTouchSandboxConversion:" destination="9pv-A4-QxB" eventType="primaryActionTriggered" id="rrx-sb-cn1"/>
+                                        </connections>
+                                    </button>
                                 </subviews>
                             </stackView>
                         </subviews>

Demo/ParselyDemo/FirstViewController.swift

@@ -5,12 +5,38 @@ import ParselyAnalytics
 class FirstViewController: UIViewController {
     let delegate = UIApplication.shared.delegate as! AppDelegate
 
+    // Sandbox test URL for the conversion-tracking smoke flow. Both the pageview and
+    // the conversion buttons fire against this URL on the `sandbox.joshhanson.io` apikey
+    // so pageview history and conversion events share a visitor session in the backend.
+    private let sandboxUrl = "https://sandbox.joshhanson.io/path/test-conversion2"
+    private let sandboxSiteId = "sandbox.joshhanson.io"
+
     @IBAction func didTouchButton(_ sender: Any) {
         log("didTouchButton")
         let demoMetas = ParselyMetadata(authors: ["Yogi Berr"])
         delegate.parsely.trackPageView(url: "http://parsely.com/path/cool-blog-post/1?qsarg=nawp&anotherone=yup", metadata: demoMetas, extraData: ["product-id": "12345"], siteId: "subdomain.parsely-test.com")
     }
 
+    @IBAction func didTouchSandboxPageview(_ sender: Any) {
+        log("didTouchSandboxPageview")
+        delegate.parsely.trackPageView(
+            url: sandboxUrl,
+            extraData: ["source": "ios_demo_app"],
+            siteId: sandboxSiteId
+        )
+    }
+
+    @IBAction func didTouchSandboxConversion(_ sender: Any) {
+        log("didTouchSandboxConversion")
+        delegate.parsely.trackConversion(
+            url: sandboxUrl,
+            conversionType: .subscription,
+            conversionLabel: "ios_smoke_test_v2",
+            extraData: ["plan": "weekly", "source": "ios_demo_app"],
+            siteId: sandboxSiteId
+        )
+    }
+
     @IBAction func didStartEngagement(_ sender: Any) {
         log("didStartEngagement")
         delegate.parsely.startEngagement(url: "http://parsely.com/very-not-real", urlref: "http://parsely.com/not-real", extraData: ["product-id": "12345"], siteId: "engaged.parsely-test.com")