iOS: screenshots no longer captured since 8.19.0 (Feedback Widget, attachScreenshot, captureScreenshot) #6497

Summary

Starting in 8.19.0, on iOS the SDK fails to capture screenshots. NATIVE.captureScreenshot() returns empty, which breaks every feature that relies on it:

• Feedback Widget with screenshot — tapping the screenshot button and submitting shows an "Error capturing screenshot. Please try again." alert and the report can't be sent.
• attachScreenshot: true — error/crash events are sent without the screenshot attachment (fails silently).
• Sentry.captureScreenshot() — returns empty/null.

Affected versions

• 8.19.0 and later (regression introduced by refactor(ios): Migrate from PrivateSentrySDKOnly to SentrySDK.internal #6380).

Steps to reproduce

1. RN app with Sentry.init({ attachScreenshot: true, integrations: [Sentry.feedbackIntegration({ enableTakeScreenshot: true })] }) on iOS.
2. Feedback: open the widget → "Take a screenshot" → submit → "Error capturing screenshot" alert appears.
3. attachScreenshot: capture any exception → the resulting event has no screenshot.png attachment.

Also see failed Feedback E2E test on main https://github.com/getsentry/sentry-react-native/actions/runs/29898734412/job/88856598124

Confirmed locally by running the RN sample:

• pre 8.19.0 with screenshot: https://sentry-sdks.sentry.io/issues/5005282269/events/eb0d408ff2434e1b83246a6efd90eda8/?project=5428561
• 8.19.0 no screenshot: https://sentry-sdks.sentry.io/issues/5005282269/events/85390da86b1749a1a985645ad89efe63/?project=5428561