Event listener clean up

[cyanzhong]

No description provided.

[Copilot]

Pull request overview

This PR addresses event listener memory leaks by implementing proper cleanup strategies for event handlers. The changes prevent duplicate event listener registrations that would occur when the editor is reset multiple times.

Changes:

• Implemented cleanup logic for gutter hover effect event listeners to prevent duplicates when line numbers are toggled
• Moved window and viewport resize event listeners from resetEditor() to module level to prevent duplicate registrations on editor resets

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
CoreEditor/src/styling/config.ts	Added storage for event handlers and cleanup logic to remove old gutter listeners before attaching new ones
CoreEditor/src/core.ts	Relocated window resize and visualViewport listeners to module level, fixing memory leak from duplicate registrations in resetEditor()

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