Add support for undo/redo on datalayer notebooks

[goanpeca]

Fixes #9

Depends on:

• Update adapter to handle undo/redo actions jupyter-ui#415

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[Copilot]

Pull Request Overview

This PR adds undo/redo functionality to datalayer notebooks by implementing keyboard shortcuts (Cmd/Ctrl+Z for undo, Cmd/Ctrl+Shift+Z or Ctrl+Y for redo) and refactoring cell insertion operations to use the centralized notebookStore2 state management.

Key changes:

• Keyboard event handlers for undo/redo operations in NotebookEditor
• Refactored cell insertion to use notebookStore2 instead of direct NotebookActions calls
• Webpack configuration updates to ensure single React instance across the application

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
webview/notebook/NotebookToolbar.tsx	Refactored code/markdown cell insertion to use notebookStore2.insertBelow() instead of NotebookActions
webview/notebook/NotebookEditor.tsx	Added keyboard event listener for undo/redo shortcuts with platform-specific handling
webpack.config.js	Added React deduplication via aliases and splitChunks optimization to prevent multiple React instances
patches/@datalayer+jupyter-react+1.1.7.patch	Patch file adding undo/redo methods to Notebook2Adapter and Notebook2State, plus React component updates
package.json	Added explicit dependency on @datalayer/jupyter-react version 1.1.7

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[echarles]

LGTM Thx @goanpeca