fix(action-sheet): correct some cancelable misbehaviors

[jcesarmobile]

Android was not returning canceled: false when not canceled.
Web was not setting a default false value, passing undefined to PWA elements, which caused issues on the first presentation.
iOS was not behaving as documented when there was a Cancel button and it can support the cancelable option on iOS 18 and older if there is no Cancel button.

Also, added a few changes in the definition docs.

[github-actions]

Released dev build of action-sheet with dev version: 8.1.1-dev-2491-20260312T121343.0

[OS-pedrogustavobilro]

Tested with the dev build on the testapp PR, all's working well on Android iOS and Web.

Thank you for looking into this and making the fixes!

I left a comment, that maybe is more subjective, but I'll approve the PR nonetheless.

[OS-pedrogustavobilro]

Minor: While ActionSheetButtonStyle only applies for iOS, when it was said "if there is a button with ActionSheetButtonStyle.Cancel" it started to give me a wrong impression that it applied to other platforms as well

I'm thinking of something like

   * On iOS, it is not available if there is a button with ActionSheetButtonStyle.Cancel, or if device is on iOS 26+.
   * In those cases, the Action Sheet is always cancelable by clicking outside of it.

Maybe this is a subjective matter, but let me know what you think.

[jcesarmobile]

yeah, at first I put it in separate lines and then, since both related to iOS and style is iOS only, I put it together and removed iOS from the second part.
But it's true that could be confusing since people might have not read that style is iOS only.
Changed it.