Adds Custom Event Map

[marklundin]

Adds a Custom Event Map to useAppEvent which allows subscribing to user defined events. Fixes #203

// Custom events (with generic)
interface MyEventMap {
  levelComplete: (level: number, score: number) => void;
}

useAppEvent<MyEventMap>('levelComplete', (level, score) => { /* level logic */ });

Tests included. Docs updated

[changeset-bot]

🦋 Changeset detected

Latest commit: 28e1096

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@playcanvas/react	Patch
@playcanvas/blocks	Patch

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[Copilot]

Pull Request Overview

This PR adds custom event map support to the useAppEvent hook, allowing developers to define and subscribe to custom application events with full TypeScript type safety. The hook now accepts generic type parameters to support user-defined events beyond the built-in PlayCanvas events.

Key changes:

• Redesigned the hook's type system to support custom event maps via generics
• Updated the event handler to accept variable arguments for custom events
• Added comprehensive documentation and examples for custom event usage

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

File	Description
packages/lib/src/hooks/use-app-event.ts	Core hook implementation with generic type support and updated event handling
packages/lib/src/hooks/use-app-event.test.tsx	Test cases for custom event map functionality
packages/docs/content/examples/custom-events.mdx	Complete example documentation for custom events usage
packages/docs/content/docs/api/hooks/index.mdx	Updated API documentation with custom events section

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commit: 28e1096