Improve diff preview for VSCode notebook

[wsxiaoys]

Please describe the feature you want

Currently, Pochi's diff preview functionality works well for regular files but could be improved for VSCode notebook files (.ipynb). The current implementation in DiffView class and related code in packages/vscode/src/integrations/editor/diff-view.ts and packages/vscode/src/tools/apply-diff.ts doesn't seem to have specific handling for notebook files.

When working with notebook files, the diff preview should:

1. Properly handle the JSON structure of notebook files
2. Provide a more readable diff view that shows cell-level changes
3. Preserve notebook-specific metadata and cell structure
4. Potentially show a rendered preview of how the changes would look in the actual notebook interface

The current implementation likely treats notebook files as plain text, which makes it difficult to understand what changes are being made at the cell level.

Additional context

• Relevant code:
  • DiffView implementation
  • applyDiff tool implementation
  • Notebook-related code

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[DESU-CLUB]

Hi I would like to work on this feature!