0f3cced15e
- Reorganized edit tool from `patch/` to `edit/` directory with dedicated mode subdirectories (chunk, patch, hashline, replace). - Replaced line-scoped edit operations with substring-based `find` parameter and added `replace_body` operation for preserving signatures. - Added chunk focus modes (Expanded, Collapsed, Container) and focused rendering to display only touched chunks and adjacent siblings. - Implemented notebook (ipynb) language support with virtual source conversion and cell-based chunk parsing. - Enhanced chunk edit error messages with consistent checksum mismatch reporting and improved chunk selector auto-resolution. - Extracted edit mode implementations into separate modules with improved helper functions and LSP integration for diagnostics.