dsh-input-history: Input History Backtracking for DeepSeek Harness Web Canvas

`dsh-input-history` is a DeepSeek Harness client plugin developed by NightsVesa, designed to optimize the input experience on the web canvas. It allows users to quickly review history or restore unfinished drafts using keyboard shortcuts (Up and Down arrows). The plugin supports session isolation with a capacity limit of 256 entries and preserves native behavior. Installation is simple, though menu conflicts and environment requirements should be noted; it can significantly enhance conversation management efficiency.