feat: diff UI for find and replace tools

[RomneyDa]

Description

Continuation of #7267

Adds nice diff UI for the new find and replace tools:

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Summary by cubic

Adds a collapsible diff view for find-and-replace tools so users can preview changes inline and accept/reject them without leaving the chat. Also preloads file content to generate accurate diffs and smoother UX.

• New Features

  • Diff UI for SingleFindAndReplace and MultiEdit with +/- highlighting, error/empty states, status icon (click to view output), file open on click, and ApplyActions for accept/reject; auto-expands when status is "generated".
  • Accurate previews by preloading file content into parsedArgs (enhanceParsedArgs) and updating tool impls to use editingFileContents across single/multi/search-replace.
  • Replaces placeholder EditFile rendering in FunctionSpecificToolCallDiv; adds focused tests for FindAndReplaceDisplay.

• Dependencies

  • Added diff and @types/diff.

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[cubic-dev-ai]

6 issues found across 14 files

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[chezsmithy]

This is super cool. One of my favorite things about continue is how it uses the chat so effectively vs other tools.

[sestinj]

🎉 This PR is included in version 1.10.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[sestinj]

🎉 This PR is included in version 1.11.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀