Develop

[TeaCoder52]

Description

This PR brings two major improvements:

Explorer tabs context menu

• Added right-click context menu for tabs in the Explorer.
• Users can now close, close others, or close all tabs directly from the menu.
• Improves UX when managing multiple open tabs.

DataGrid performance upgrade

• Replaced the old -based rendering with a virtualized, headless grid engine.
• Introduced columnar data storage and logical/physical row indexing.
• Supports fast sorting, filtering, and cell editing even with thousands of rows.
• Sticky headers and absolute positioning for smooth scrolling.
• Overall, this dramatically improves rendering performance and reduces DOM overhead.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have updated the documentation if necessary
• All new and existing tests passed
• PR is ready for review