VSCode extension: per-hunk accept/reject diff UI for file edits

When Claude Code edits a file, changes are applied immediately. GitHub Copilot's inline diff UX — where each changed hunk gets Accept/Reject buttons in the editor gutter, plus per-file Accept All / Reject All — makes it easier to review and selectively apply edits, especially for larger changes.

Request: Add an inline diff suggestion mode to the VSCode extension so edits are presented as proposals (similar to Copilot's edit suggestions) rather than being applied directly, with per-hunk and per-file accept/reject controls.

This would be particularly useful for multi-file or high-risk edits where the user wants fine-grained control before committing to changes.