feat(ui): add token diff support in diff view

[linghaoSu]

Fixes #19969

Before

Now

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
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[nitishfy]

LGTM! Thanks

[alexmt]

Looks great!

[linghaoSu]

@alexmt hi, here's another pr for diff, can you take a look at it, it improves performance when diffing a large number of files at the same time and prevents the browser from crashing.

#19921