fix: consistent API exports

[marklawlor]

Fix #169

[Copilot]

Pull Request Overview

This PR consolidates the API exports by moving the VariableContext from the reactivity module to the style-collection module and updating all imports to use the consistent export path. The key changes ensure that all React Context instances are created once globally and exported from a single location.

• Moved VariableContext creation from reactivity module to style-collection module with global singleton pattern
• Updated VAR_SYMBOL to use Symbol.for() for global symbol registry
• Updated all import statements across the codebase to use the new export location

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/style-collection/index.ts	Added VariableContext creation and export with global singleton pattern
src/runtime/native/reactivity.ts	Removed VariableContext creation, changed VAR_SYMBOL to use Symbol.for()
src/runtime/native/react/useNativeCss.ts	Updated VariableContext import to use style-collection export
src/runtime/native/api.tsx	Updated exports and imports to use style-collection for VariableContext
src/components/react-native-safe-area-context.native.tsx	Updated VariableContext import path
src/tests/native/variables.test.tsx	Updated import path for VariableContextProvider
src/tests/native/units.test.tsx	Updated VariableContext import path
example/src/App.tsx	Enhanced example with VariableContextProvider usage

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[marklawlor]

• fix: consistent API exports #174 👈 (View in Graphite)
• main

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