[fix] Fix action sheet opacity for iOS Liquid Glass

[Tehnix]

Description

This sets a lower bound for the action sheet opacity to 0.02 on iOS, to work around Liquid Glass limitation on iOS where a too low alpha makes the Liquid Glass background disapear entirely.

I've tested with values lower than 0.02, but these also seem to break Liquid Glass (e.g. 0.01 will not work). I'm currently using these changes here locally and everything seems to be working nicely.

Note that this is a small change to the default value of the opacity on iOS, but I think it's worth not putting behind a prop (or at least making it the default) to avoid people getting a surprising behavior when trying to use Liquid Glass views, which I would assume would only start happening more - not everyone will be lucky to find out that opacity from parent views (even when not active) can break the Liquid Glass views 😅

More info

• Official docs from Apple https://developer.apple.com/documentation/uikit/uivisualeffectview#Set-the-correct-alpha-value
• More context [ios][ui] expo-glass-effect doesn't work with animated parent opacity changes expo/expo#41024

Screenshots

Without this patch, the Liquid Glass effect will disappear entirely	With opacity 0.02 it now shows up

The above is using Glass Effect from Expo, but from the linked issue independent implementations also run into the opacity issue, e.g. https://github.com/callstack/liquid-glass (callstack/liquid-glass#27 (comment)).

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[Tehnix]

@ammarahm-ed let me know if there's any changes needed to this. I've been running it in production for a while and it fixes my issues with Liquid Glass otherwise being broken.

I could amend it to be configurable?

[sbcarp]

+1 to this