feat(admob): demonstrate rewarded ads and diagnostics

[polmiro]

Summary

Expands the Google Mobile Ads Next-Gen example app with rewarded-ad and diagnostics workflows:

• add direct and preloaded rewarded-ad workflows
• demonstrate optional RevenueCat reward verification
• add intentional direct and preload failures for diagnostics

Screenshots

---

Note

Low Risk
Example-app UI only; no SDK or production code changes.

Overview
Replaces placeholder routes in the AdMob Next-Gen sample with Rewarded and Diagnostics screens wired through SampleUi.

Rewarded adds the same direct-vs-preloaded flow as other formats: load/show via loadAndTrackRewardedAd, preloader startAndTrack / pollAndTrackAd, and a toggle to enable RevenueCat reward verification on load/poll (verification vs Google’s OnUserEarnedRewardListener at show time).

Diagnostics deliberately uses an invalid interstitial ad unit to trigger expected load failures and surface RevenueCat failed-to-load tracking for both direct load and interstitial preloading.

^{Reviewed by Cursor Bugbot for commit d3604f1. Bugbot is set up for automated code reviews on this repo. Configure here.}

[emerge-tools]

📸 Snapshot Test

621 unchanged

Name	Added	Removed	Modified	Renamed	Unchanged	Errored	Approval
TestPurchasesUIAndroidCompatibility com.revenuecat.testpurchasesuiandroidcompatibility	0	0	0	0	339	0	N/A
TestPurchasesUIAndroidCompatibility Paparazzi com.revenuecat.testpurchasesuiandroidcompatibility.paparazzi	0	0	0	0	282	0	N/A

---

🛸 Powered by Emerge Tools