Fix IDs.

src/index.ts

@@ -85,7 +85,7 @@ const notebooks: JupyterFrontEndPlugin<void> = {
  * A plugin providing a condensed sidebar UI for debugging.
  */
 const sidebar: JupyterFrontEndPlugin<void> = {
-  id: '@jupyterlab/debugger:plugin',
+  id: '@jupyterlab/debugger:sidebar',
   optional: [ILayoutRestorer],
   autoStart: true,
   activate: (app: JupyterFrontEnd, restorer: ILayoutRestorer | null) => {
@@ -108,7 +108,7 @@ const sidebar: JupyterFrontEndPlugin<void> = {
  * A plugin providing a tracker code debuggers.
  */
 const tracker: JupyterFrontEndPlugin<IDebugger> = {
-  id: '@jupyterlab/debugger:plugin',
+  id: '@jupyterlab/debugger:tracker',
   optional: [ILayoutRestorer],
   requires: [IStateDB],
   provides: IDebugger,

style/index.css

@@ -3,7 +3,7 @@
 | Distributed under the terms of the Modified BSD License.
 |----------------------------------------------------------------------------*/
 
-.jp-Debugger {
+.jp-DebuggerSidebar {
   background: var(--jp-layout-color1);
   top: 0;
   bottom: 0;