Refactor MTE-5265 Xcode 26.4 upgrade

[clarmso]

📜 Tickets

Jira ticket
Github issue

💡 Description

Let me use this (draft) PR to show the incompatibilities on Xcode 26.4 and the Firefox iOS code base

🎥 Demos

Before	After

Demo

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If adding or modifying strings, I read the guidelines and will request a string review from l10n
• If needed, I updated documentation and added comments to complex code

[mobiletest-ci-bot]

	Warnings
⚠️	Detected shell script changes in: firefox-ios/l10n-screenshots.sh, focus-ios/l10n-screenshots.sh (cc @adudenamedruby)

💪 Quality guardian

2 tests files modified. You're a champion of test coverage! 🚀

🥇 Perfect PR size

Smaller PRs are easier to review. Thanks for making life easy for reviewers! ✨

🙌 Friday high-five

Thanks for pushing us across the finish line this week! 🙌

🌟 Documentation star

Great documentation touches. Future you says thank you! 📚

✅ New file code coverage

No new file detected so code coverage gate wasn't ran.

Generated by 🚫 Danger Swift against 69bc027

[clarmso]

Do not merge this PR unless we can confirm if iOS 15 is supported.
#32731

[adudenamedruby]

Added the DO Not Merge label for now, @clarmso

[adudenamedruby]

@clarmso as per xcode release docs, 24.6 does support ios 15. :)

[clarmso]

@clarmso as per xcode release docs, 24.6 does support ios 15. :)

Deployment targets include iOS 15-26.4. The simulator includes iOS 15.

"Xcode 26.4 supports on-device debugging in iOS 15 and later"
https://developer.apple.com/documentation/xcode-release-notes/xcode-26_4-release-notes