[WAL-1078] follow-up: add OpenID4VP rejection scenario

[szijpeter]

Summary

Adds the WAL-1078 OpenID4VP rejection path as a follow-up stacked on #1882. The mobile wallet can now send a protocol-level rejection response instead of treating Decline as a purely local cancel action.

The branch reuses the existing core walletRejectHandling(...) behavior and exposes a small Swift-friendly API through the KMP mobile SDK, Swift SDK facade, Compose demo, and native iOS demo.

What Changed

Mobile SDK and Handler

• Added RejectPresentationRequest and WalletPresentationHandler.rejectPresentation(...).
• Added MobileWallet.rejectPresentation(...).
• Added MobileWalletPresentationRejectionReason with the rejection codes already supported by the core OpenID4VP wallet implementation.
• Updated the mobile SDK ABI dump.

Swift Parity

• Added Wallet.rejectPresentation(request:reason:errorDescription:).
• Added PresentationRejectionReason in the Swift SDK.
• Wired the KMP Swift bridge and bridge tests for the new rejection path.

Demo Apps

• Compose demo now wires the presentation review Decline action to protocol rejection.
• Native iOS demo now wires the same rejection action through WalletClient.
• Status remains scoped to the Present tab and no longer behaves like a global wallet status.

Tests

• Added/updated bridge tests for rejection forwarding.
• Updated Compose controller/UI tests for protocol rejection instead of local cancel.
• Updated native iOS model/UI tests for rejection status scoping and the renamed Decline action.

Architecture Notes

• This PR intentionally sits on top of #1882, which provides preview and credential-level presentation submission.
• Rejection stays separate from transaction-data display and claim-level selective disclosure so the protocol behavior can be reviewed independently.
• The public mobile API accepts a typed rejection reason while still passing the protocol error code into the shared core handler.

Caveats and Follow-Ups

• No transaction-data rendering here; that is #1893 / WAL-1077.
• No claim-level selective disclosure here; that remains #1894 / WAL-751 follow-up scope.
• Public backend verifier-session behavior should still be smoke-tested before merging if we want end-to-end confirmation beyond local handler and demo tests.

Validation

• ./gradlew :waltid-libraries:protocols:waltid-openid4vc-wallet-mobile:updateKotlinAbi -PenableIosBuild=true
• ./gradlew :waltid-libraries:protocols:waltid-openid4vc-wallet-mobile:checkKotlinAbi :waltid-libraries:protocols:waltid-openid4vc-wallet-mobile:allTests :waltid-applications:waltid-wallet-demo-compose:sharedLogic:allTests :waltid-applications:waltid-wallet-demo-compose:sharedUI:testAndroidHostTest -PenableIosBuild=true
• xcodebuildmcp simulator test ... -only-testing:iosAppTests/CredentialDisplayNormalizerTests
• xcodebuildmcp simulator test ... -only-testing:iosAppUITests/MockWalletUITests/testTabbedReceiveAndPresentFlowUsesMockWallet

Breaking

• No breaking changes expected; the SDK additions are additive.

[linear-code]

WAL-1078

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud