When running a prompt on a selected text block, Novelcrafter should display the changes as a visual diff instead of replacing the text immediately.

Suggested behavior:

Show additions in green.

Show removals in red with strikethrough.

Allow the user to review the changes before accepting them.

Include options such as:

Accept All

Reject All

Accept Individual Changes

This would be especially useful when:

Improving prose

Rewriting dialogue

Adjusting pacing

Fixing grammar

Expanding or shortening passages

Editing Codex or Lorebook entries

The same diff view should also appear when using the chat to improve or modify an existing text block or entry.

This would make AI-assisted editing much safer, clearer, and easier to review, especially for large passages where it is difficult to track what changed.