test: ui tests speedup

[lynnswap]

Summary:

• Add TabBarDemoUITests target and UI tests for tab menu interactions
• Disable preview animations during UI testing via launch arguments
• Streamline UI test flow and waits to reduce execution time

Testing:

• xcodebuild test -project Examples/TabBarDemo/TabBarDemo.xcodeproj -scheme TabBarDemo -destination 'platform=iOS Simulator,name=iPhone 17 Pro,OS=26.2' -only-testing:TabBarDemoUITests

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 13dd60152f

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[lynnswap]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep it up!

ℹ️ About Codex in GitHub

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• Mark a draft as ready
• Comment "@codex review".

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