dsh-panel-scroll: Add scrolling to DSH sidebar

gusong1729/dsh-panel-scroll is a DSH client plugin that applies a layout patch to the DeepSeek Harness Web/Desktop interface. The left column panel list is capped at 4 rows by default, with the remaining items scrolling out via the wheel to prevent the workspace from being pushed out of the window. In the right column, any container whose content exceeds the box height but is trimmed by `overflow: hidden/clip` is modified to be vertically scrollable. Configuration is handled via `localStorage`, where `rows` sets the number of display lines and setting `unclog` to `off` allows retaining only the left column capping. The plugin locates the list by registering invisible marker rows and uses style sheets with `!important` instead of inline styles. The right column is positioned based on the widest container attached to the viewport's right edge and with a height of at least 70% of the viewport, taking over `hidden/clip` clipping and start-side overflow. It has been verified on dsh 0.2.1-rc.2, relies on the shell's DOM structure, and will simply have no effect if it fails. You should check the source code and license before installing, which follows the MIT License.