dsh-conversation-files: Collect files generated by the assistant across conversations into a sidebar gallery

The client-side plugin `dsh-conversation-files`, maintained by Shall0vv, adds an entry for "Conversation Files" to the left sidebar of DSH. It aggregates files actually generated by the assistant across all conversations in the profile into a gallery panel grouped by file extension. It only counts files written via tools such as `write`, `edit`, `apply_patch`, and files delivered via `present` style tools, excluding read-only operations and user attachments, while providing different thumbnails for images, code, documents, archives, etc. The panel supports filtering by write type, file type, and extension, as well as searching by filename or path, and allows switching between card and list views. Clicking a card opens it with the default application, and the context menu (bottom-right) offers options to select an app, show in Finder, or move to Trash, with deleted files marked separately. Installation is done by cloning via git and registering with `plugin_manager install_bundle`. Updates require using `remove_bundle` to uninstall before reinstalling. The plugin runs on macOS, relies on QuickLook for document thumbnails, only parses tool call arguments, and cannot recognize files written via bash redirection.