dsh-inline-diff: View File Edits in the Chat Flow

The `dsh-inline-diff` plugin for DSH replaces the default single-line editing view with a permanently expanded side-by-side diff view. The left side shows the old code, while the right side shows the new code, with changes highlighted using colors (green for additions and red for deletions) plus word-level highlighting. The plugin supports line numbers, syntax highlighting, collapsing of long blocks, mouse hover interactions, and customizable display options via settings. Installation can be done via the CLI or by adding configuration to `package.json` and `cordis.patch.yml`. The plugin is compatible with specific themes and was written by AI.