dsh-ide-sidebar: DSH Web Workspace Switching Sidebar

`dsh-ide-sidebar` is a DSH Web browser-side plugin maintained by `yuhangkang`, designed as an IDE-style workspace switcher sidebar. The plugin adopts a pure browser-side bundle architecture with no host behavior or server-side dependencies. It is only applicable to the `web` platform and requires `dsh >= 0.1.0-rc`. Its core features include a floating dropdown workspace switcher in the top-left corner, filtering session lists by workspace, displaying status lights for completion and pending confirmation, searching for workspaces and sessions, and CRUD management of workspaces and sessions. The plugin has no configuration options, as all behaviors are built-in. Installation requires adding it via the `dsh plugin` command, registering the bundle name in the profile's `package.json`, and taking effect after a restart.