dsh-conversation-minimap: DeepSeek Harness Conversation List Breadcrumb Navigation

`dsh-conversation-minimap` is a DeepSeek Harness plugin designed to solve the challenge of locating content in long conversations. It provides a Codex-style visual navigation track with marked and highlighted turns; mouse hover or keyboard controls allow previewing conversation summaries and status. The plugin supports adaptive layouts for wide/narrow columns and short/long histories, is compatible with multiple themes and versions, and is highly performant and non-invasive, significantly improving the readability and development efficiency of long conversations.