feat(diff): add line wrap toggle

[tyler-builds]

What Changed

Adds a new toggle button in the diff view header that toggle line wrapping in the diff. This is next to the split/unified toggle group and follows the same styling.

Why

When the diff panel width is small and the lines are long, the changes are out of view making review hard. This was especially bad when using split view.

UI Changes

Line wrapping off

Line wrapping on

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add line wrap toggle to DiffPanel

Adds a toggle button to the DiffPanel header using WrapTextIcon that switches between scroll and wrap overflow modes. The selected mode is passed as an overflow option to each FileDiff, controlling whether long lines scroll horizontally or wrap.

^{Macroscope summarized 87fad1e.}

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[juliusmarminge]

nit: not a group with just one item. use Toggle without wrapper

[tyler-builds]

Thanks! I’ve changed it to use Toggle directly.