fix: resolve iOS Native test execution issues

[MrSmart00]

Summary

• Switch test-native from swift test to xcodebuild test to avoid SwiftGen prebuild plugin errors
• Update Makefile to run both ComponentTests and FeatureTests on iOS Simulator
• Add iOS Native tests to GitHub Actions workflow with macOS runner

Background

The swift test command was failing with SwiftGen prebuild plugin errors:

error: a prebuild command cannot use executables built from source, including executable target 'swiftgen'

This is due to SwiftPM's security restrictions on prebuild plugins, which cannot use executable targets built from source.

Changes

• Makefile: Replace swift test with xcodebuild test for test-native target
• GitHub Actions: Add test-native job using macOS 15 + Xcode 16.4
• Use iPhone 16 Pro simulator for consistent test results
• Enable parallel execution of Core tests (Ubuntu) and Native tests (macOS)

Test Plan

• Verify xcodebuild test works locally with SwiftGen plugin
• ComponentTests and FeatureTests execute successfully
• CI pipeline runs both test jobs in parallel

Dependencies

This PR depends on #112 for the FeatureTests target definition.

🤖 Generated with Claude Code

[Copilot]

Pull Request Overview

This PR fixes iOS Native test execution issues by switching from swift test to xcodebuild test to resolve SwiftGen prebuild plugin errors, and adds iOS Native testing to the CI pipeline.

• Replace swift test with xcodebuild test using iPhone 16 Pro simulator
• Add macOS-based GitHub Actions job for Native tests with proper Xcode setup
• Enable parallel execution of Core tests (Ubuntu) and Native tests (macOS)

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
app-ios/Makefile	Updates test-native target to use xcodebuild with iPhone 16 Pro simulator instead of swift test
.github/workflows/ios-test.yml	Adds new test-native job with macOS 15 runner and Xcode 16.4 configuration

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[Copilot]

Consider upgrading to actions/cache@v4 for better performance and compatibility with newer GitHub Actions runners.

Suggested change

	uses: actions/cache@v3
	uses: actions/cache@v4

[MrSmart00]

This PR is failing in CI, but the failure is due to a check unrelated to the content of this PR, so I think it's fine to proceed with the review as is 🤔

[touyou]

LGTM👍
I thought the CI would likely pass if we merge the latest main branch, so it would be good to confirm that.