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[ienaga]

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[Copilot]

Pull Request Overview

This PR bumps the Next2D Player version to 2.10.0, fixes an alpha channel overflow issue in gradient fills, and updates development dependencies.

• Version updated from 2.9.0 to 2.10.0
• Fixed potential alpha value overflow in GraphicsGradientFill by adding bit masking
• Updated TypeScript ESLint and Vitest dependencies to latest minor versions

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
src/index.ts	Updated console log version string to 2.10.0
packages/display/src/GraphicsGradientFill.ts	Added & 0xff bit mask to alpha calculation to prevent overflow beyond byte range
package.json	Version bump to 2.10.0 and minor dependency updates for eslint plugins and vitest
package-lock.json	Synchronized lockfile with package.json dependency updates

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