capture and validate Stripe Checkout screenshots

[atavism]

Captures the Stripe Checkout WebView directly during the macOS payment smoke test, waits until it contains visible rendered content, and saves the resulting PNG with the test artifacts.

[coderabbitai]

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[Copilot]

Pull request overview

Adds first-class Stripe Checkout WebView screenshot capture to the macOS desktop payment smoke test, validating that the Checkout UI is visibly rendered and emitting the PNG as a CI artifact.

Changes:

• Extend AppWebViewObserver.onPageLoaded to support async observers and provide a captureScreenshot callback.
• Update the macOS Stripe Checkout integration test to poll until the WebView screenshot shows rendered content, then persist it via a --dart-define path.
• Simplify the macOS smoke runner script to pass the screenshot output path into the test and assert the artifact was created.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
lib/core/widgets/app_webview.dart	Makes page-load observation async and supplies a screenshot capture callback to observers.
integration_test/payment/desktop_stripe_checkout_smoke_test.dart	Captures/validates Stripe Checkout WebView screenshots on macOS and writes them to an artifacts path.
.github/scripts/macos_payment_checkout_smoke.sh	Passes screenshot output path via --dart-define and checks that the PNG exists.

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