Basic side-by-side diff implementation (#43586)

Release Notes:

- N/A

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Co-authored-by: cameron <cameron.studdstreet@gmail.com>
Co-authored-by: Cameron <cameron@zed.dev>
2e00f40c54Cole Miller committed on 12/1/2025, 3:45:01 AM· committed by GitHubparentca6e64d
29 files changedLine totals unavailable