fix(page-controller): dispatch input before change on select option

[9426Haruka]

What

Native <select> interactions dispatch input before change. This updates selectOptionElement to follow that order so React-controlled and other event-driven forms receive both events.

Type

• Breaking change
• Bug fix
• Feature / Improvement
• Refactor / Chores
• Documentation / Website / Demo / Testing

Testing

• npm run ci passes
• Tested with a happy-dom unit test
• Types/doc added

Added a page-controller test asserting that the selected value updates and that input is dispatched before change.

Requirements / 要求

• I have read and follow the Code of Conduct and Contributing Guide . / 我已阅读并遵守行为准则。
• This PR is NOT generated by a bot or AI agent acting autonomously. I have authored or meaningfully reviewed every change. / 此 PR 不是由 bot 或 AI 自主生成的，我已亲自编写或充分审查了每一处变更。