dsh-search-chat: Search chat history across workspaces in the DSH right sidebar

dsh-search-chat is a DSH host plugin that provides literal search across chat history from all workspaces in the right sidebar. It supports phrase/whole word/any word matching, sorting by time, clicking to jump to and highlight the original message, a timeline view by date (scrolling +/- 3 days), search history, and local caching. Highlighting and panel appearance are customizable. It requires DSH 0.2.2-rc.1 or higher and can be installed via the official plugin manager by directory or package name. It involves no corpus, no model, and no external calls; all search and caching operations are performed locally. It is essentially a literal match without semantic understanding.