WaitBuddy: Add a Long-Running Task Monitor and Mini-Game Panel to DSH Sessions

WaitBuddy is a session view plugin for DSH Desktop maintained by CelineHuangdz. The current version is 0.4.1, tested on DSH 0.2.1-rc.5. It adds a WaitBuddy tab next to Chat/Trajectory, providing status for long-running tasks, step counts, activity streams, and an independent approval/failure notification bar, while also featuring two built-in mini-games: Snake and Gomoku. Agent events drive the games in a one-way manner via `agent:*` rules: approval pauses the game, success grants +50, and stepping grants +5. The plugin does not control the Agent, does not intercept native approvals, and does not write session logs. The article provides official installation methods (including GitHub, local directory, tarball, and npm) and typical usage steps, as well as explaining configuration options and known discrepancies.