fix: guard against null ScreenCornerRadius native module on simulator

[blazejkustra]

Summary

On the iOS simulator (and any setup where the native module isn't registered), NativeModules.ScreenCornerRadius is null. The current code reads .cornerRadius off it directly:

export const ScreenCornerRadius: number =
  NativeModules.ScreenCornerRadius.cornerRadius ?? 0;

The ?? 0 only guards .cornerRadius being null/undefined — it does not guard NativeModules.ScreenCornerRadius itself being null. So on the simulator this throws:

TypeError: Cannot read property 'cornerRadius' of null

at import time, which surfaces as an error in Metro. The doc comment promises "May also be 0 if the corner radius couldn't be detected", but it throws instead of falling back to 0.

Fix

Optional-chain the module access so it falls back to 0 (and IsScreenRounded to false) as documented:

export const ScreenCornerRadius: number =
  NativeModules.ScreenCornerRadius?.cornerRadius ?? 0;

One-line change in src/index.ts.

Test plan

• Run an app importing ScreenCornerRadius on an iOS simulator → no longer throws; ScreenCornerRadius is 0 and IsScreenRounded is false.
• On a physical device the native module is present, so behavior is unchanged.