What it may solve
Session-scoped diff view for the DSH Web right sidebar: opening a file the current conversation changed renders it in place with git-style added/removed line backgrounds, +/− gutter markers and dual old/new line numbers under syntax colouring, a header with +added −removed counts, a Changes only / Whole file toggle and a Re-read button, plus a companion tab that lists every file the session changed and opens each one in the same view. Files the conversation did not touch keep the shipped text viewer.
Imported third-party catalog description; not a Registry verification conclusion.