git style diffs

[Byron]

This PR should improve the diff quality as it introduces a Sink that calculates Git diffs with hunks similar to what xdiff does.
At least in theory, as I didn't vet the algorithm, just the implementation.

This makes using the new Sink a bit of a leap of faith, as it uses enough slice-indices to make panics quite possible. There is also not a lot of tests, nor is there a fuzzer setup, so anything could happen.
Ideally, it will just work though, and if it gives trouble it should be easy to revert the commit.

It will probably be used in bat soon: sharkdp/bat#3235 (comment).

And lastly, here is two diffs that show where the new algorithm differs - the slider is at the bottom of the diff, and the upper diff is more desirable thanks to the new algorithm.

Tasks

• update gix for GitDiff Sink
• Bonus: Additional updates to auto-updateable dependencies
• use new Sink when creating unified diffs

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
gitbutler-components	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 18, 2025 9:02pm

[vercel]

@Byron is attempting to deploy a commit to the GitButler Team on Vercel.

A member of the Team first needs to authorize it.

[Byron]

The E2E tests seem to be genuinely failing, even though I have trouble seeing how this is related.
The frontend shows diffs like normal.

[Byron]

Checked with the team and we decided it's OK to merge it, noting that:

• there is a risk this panics and if that happens we can undo this change easily in unified_diff.rs
• it has the potential to fix a current problem where V2 and V3 diffs don't match up

CC @krlvi .