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[ienaga]

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[Copilot]

Pull request overview

This PR updates the Next2D Player to version 2.12.0 with a bug fix for Stage's addChild method and adds comprehensive test coverage for the Stage class.

• Version bumped from 2.11.0 to 2.12.0 across package files
• Fixed root map logic in Stage.addChild() to correctly set the display object as its own root
• Added comprehensive unit tests for the Stage class
• Updated dev dependencies (@typescript-eslint packages and vitest)

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/index.ts	Updated version string in console log to 2.12.0
packages/display/src/Stage.ts	Fixed addChild method to set root map after parent addChild call, ensuring correct root assignment
packages/display/src/Stage.test.ts	Added comprehensive test suite for Stage class covering initialization, properties, and addChild behavior
package.json	Updated package version to 2.12.0 and dev dependencies
package-lock.json	Updated lockfile with new version and dependency resolutions

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