fix: treat mobile Firefox on iOS as mobile Safari

[ionodeionode]

Summary

Firefox on iOS uses the WebKit rendering engine (same as Safari), so it should be treated similarly to mobile Safari for compatibility and feature detection purposes.

Changes

• Updated browser/user-agent detection logic to identify Firefox on iOS (FxiOS) as a mobile Safari-equivalent browser

Fixes #58656

[CarlSchwan]

Make sense to me but I don't use iOS so i can't test

[philiprenich]

Hi, originally reporter of the issue here. This solution only solves the problem for Firefox. As you'll see in the issue, there was discussion around solving it for all mobile webkit browsers. The PR I've submitted does this in a more generic way, rather than appending browser specific UA strings.

(I know this PR could be updated, but I wanted to get a local dev environment working to ensure I could test it all so put my own up)

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