fix(android): apply Google Pay button borderRadius via ButtonOptions

[arstiefel]

Description

Routes the Google Pay button's borderRadius prop through Google's supported ButtonOptions.Builder.setCornerRadius(int) API. The previous implementation tried to clip the host FrameLayout via ViewOutlineProvider / clipToOutline, but that has no visible effect because PayButton renders its own background drawable. Since corner radius lives on the immutable ButtonOptions, changes now trigger rebuildButton() — same pattern already used for buttonType and buttonTheme. Also bumps the example app to demo the prop with borderRadius={25}.

Testing

• Verified ./gradlew :boltpay_react-native:compileDebugKotlin builds clean.
• Manual test: run the example app on Android, observe the Google Pay button on the AddCard screen renders with rounded corners (25dp). Toggle the value to confirm changes rebuild the button correctly.
• No unit tests added — PayButton rendering is a Google-side concern, and the wiring is a thin pass-through.

Security Review

Important

A security review is required for every PR in this repository to comply with PCI requirements.

• I have considered and reviewed security implications of this PR and included the summary below.

Security Impact Summary

No security-sensitive changes. This PR only adjusts how a presentation prop (borderRadius) is forwarded to Google's Pay button rendering API on Android. It does not touch authentication, authorization, payment tokenization flows, user data handling, or external integrations.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

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✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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