[NathanWalker]

Split out of #77 (item 5 of the "NativeScript bugs" list in ng-native/ng-native#931).

Summary

Without strictGlobal, the Worklets Babel plugin captures every name a worklet doesn't declare into the worklet's closure. That closure is read on the JS thread when the defining module is evaluated, and NativeScript's classes don't exist there. A module-level worklet that names UILabel failed at startup with ReferenceError: Property 'UILabel' doesn't exist.

 // babel.config.js written by the config plugin and `nativescript-rn configure`
 presets: [
-  'babel-preset-expo',
+  ['babel-preset-expo', { worklets: false }],   // so the preset doesn't add a second copy
 ],
 plugins: [
   '@nativescript/react-native/babel-plugin',
-  'react-native-worklets/plugin',
+  ['react-native-worklets/plugin', { strictGlobal: true }],
 ],

• Bare entries in an existing config are upgraded in place.
• An entry that already has options but lacks strictGlobal gets a warning rather than a rewrite.
• The Babel setup also runs on Android-only prebuilds.

The README changes for this are in the README PR.

Evidence

node test/config-plugin.test.js runs the real plugin against temp project directories.

• Before: this branch's test against the base plugin fails:

  AssertionError: Expected values to be strictly deep-equal:
    actual: 'babel-preset-expo',
    expected: [ 'babel-preset-expo', { worklets: false } ]
  

• After: it passes.

The other package tests give the same results as on the base branch.

On the iOS simulator (tested in #77), a module-level worklet naming UILabel loads.

Merge Danger

Door: two-way

Blast Radius: generated babel.config.js

It rewrites existing configs, but only bare react-native-worklets/plugin and babel-preset-expo entries. Entries the user has already given options to are left alone and only warned about.

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