dsh-wordbox: Adding a Common Phrases Panel to DSH Web Input Fields

`dsh-wordbox` is an MIT-licensed plugin designed specifically for the DeepSeek Harness Web client, aimed at solving developers' pain point of repeatedly typing common phrases, terms, or fixed templates in conversations. The plugin provides a "Word" button on the right side of the input box; clicking it opens a persistent upward panel that supports managing two types of word libraries: global and project-isolated. Core features include one-click insertion of entries into the input box (preserving focus and undo history), continuous batch insertion, hover to display full text of long entries, quick deletion at the end of a line, and one-click synchronization of current project words to the global library. Data is stored in the browser's `localStorage`, isolated by browser Profile, and supports real-time synchronization across tabs. Installation requires `pnpm` in the environment; run the `dsh plugin add` command and restart the service to enable it.