fix: ios platform user agents

[nwidynski]

Attempting to pull out some portions of #10102, specifically #10102 (comment)

Changeset is an audit of every isIOS, isFirefox and isChrome callsite potentially impacted.

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[nwidynski]

Apple opened up their platform for alternative rendering engines a while back. This is meant to future proof against something like https://github.com/minh-ton/reynard-browser.

[snowystinger]

Thanks, I think this makes sense for preparing for the new browsers in iOS

[snowystinger]

Verified detection with new entries in story. I think the updates to the call sites are correct in the spirit of what they were checking

[snowystinger]

Just to spell this one out for practice:

Previous
iOS firefox -> false, no FxiOS matching
macOS firefox -> true

Now
iOS firefox today

• isWebKit true, isFirefox true -> false

eventually

• isWebKit false, isFirefox true -> true

macOS firefox -> true

The thinking being that Firefox will eventually have the same issues on iOS when it moves off webkit to their own engine, so it'll match desktop

[nwidynski]

correct. it also purposefully uses isWebKit rather than isIOS because these alt engines on ios may use an android ua for compatibility. The exception will be Chrome, which locked to AppleWebKit everywhere, so we will have to see whether they will offer something to differentiate on ios - tbd.