feat(action-sheet): add initialVisible prop for immediate rendering

[deyvid-bardarov]

Add initialVisible prop for immediate rendering

Summary

• Adds a new initialVisible prop to ActionSheetProps that allows the sheet to be visible immediately on initial render, without the opening animation.
• When initialVisible is true, the sheet sets its opacity and position directly to their open-state values instead of running the spring animation, avoiding any flicker or delay.
• Passes initialVisible through to useSheetManager so the internal visible state is initialized to true.

This eliminates the need for workarounds like calling ref.show() inside a setTimeout after mount.

Closes #404

Test plan

• Verify a sheet with initialVisible renders fully open on mount with no animation flicker
• Verify a sheet without initialVisible still animates open as before (no regression)
• Verify the initially-visible sheet can be closed and re-opened normally after the initial render
• Test on both iOS and Android

[vercel]

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