Theembers/dsh-workspace-icons

Adds per-workspace icons and a default session icon to the DeepSeek Harness sidebar. The workspace icon is picked inside the existing rename-workspace dialog; sessions without an IM channel get a default icon drawn with the same title pseudo-element the IM plugin uses, so the two stay aligned, while IM sessions keep their channel logo. Session rows are indented one level under their workspace with a vertical guide line. Icons come from 73 built-in Lucide glyphs, uploaded SVGs, or linked Iconify collections browsed from the official catalog, and follow the theme colors instead of a custom palette.