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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Note

Low Risk
Low risk: adds a new boolean setting and UI toggles affecting only diff rendering/overflow behavior, with no security- or data-critical logic changes.

Overview
Adds a new diffWordWrap app setting (default false) and exposes it in Settings as “Diff line wrapping” with reset-to-default support.

Updates DiffPanel to include an in-panel wrap toggle and to apply wrap vs horizontal scroll to both parsed diffs (FileDiff overflow) and raw patch rendering; the toggle is session-scoped and re-initializes from the saved setting each time the diff panel is opened.

^{Written by Cursor Bugbot for commit 7bfd460. This will update automatically on new commits. Configure here.}

Note

Add word wrap toggle to the diff panel and settings

• Adds a diffWordWrap boolean to appSettings.ts, defaulting to false, which sets the initial wrap state each time the diff panel opens.
• Adds a toggle button in the DiffPanel header to switch word wrapping on/off for the current session; passes overflow: 'wrap' or 'scroll' to FileDiff accordingly.
• Adds a 'Diff line wrapping' row in the settings page so users can change the default, with a note that the in-panel toggle only applies to the current session.

^{Macroscope summarized 7bfd460.}

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[raphaelluethy]

I will leave this PR here, if this is something that would be useful I am glad to follow up, otherwise this can also be closed; I added this to my fork and saw it enhanced my workflow and I thought this could be a meaningful addition.

Love your work here, thanks for creating this 😊