feat: add word wrapping setting and in-panel button

[raphaelluethy]

Complementary to #1250, this PR also introduces a settings option and decouples the setting from the in-panel toggle logic.

What Changed

Added a word wrapping setting and in-diff-panel button.

The in-diff-panel button is decoupled and resets to the settings default on re-opening the diff view, I found this better when testing the change since I sometimes would like to see the unwrapped state without it changing my global settings.

Why

When working on docs and other text files the sideways scrolling breaks reading flow.

UI Changes

Before (no button for warpping):

After

With settings flow:
https://cleanshot.com/share/78GQRsvg

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

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