[FEATURE] Add accept-reject diff flow for Jupyter notebook cell edits in VSCode extension

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When Claude Code edits a regular file (.py, .ts, etc.) via the VSCode extension, it shows an inline diff with accept/reject controls. However, when editing Jupyter notebook cells via NotebookEdit, changes are applied directly to the .ipynb file on disk with no preview or confirmation step.

GitHub Copilot achieves inline suggestions inside notebook cells using VS Code's native editor suggestion API. It would be great if Claude Code had the same behavior for notebook edits — showing the proposed change inline within the cell, with the ability to accept or reject before it's applied.

Environment:

Claude Code VSCode extension
Jupyter notebook (.ipynb)
MacOS 15.6.1 (24G90) Sequoia

Proposed Solution

Expected behavior: Notebook cell edits show an inline diff/suggestion preview with accept/reject controls, consistent with the experience for regular file edits.

Current behavior: NotebookEdit writes directly to disk; the change appears immediately with no preview.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Developer tools/SDK

Use Case Example

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Additional Context

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