Clean up the panel after host testing

Drop the render restarts added while chasing the black overlays; keep
the full render-error report and stop the timer after an error, as
Cesium does. Correct comments the investigation outran, share the
panel_request name, and document the host differences the panel works
around.

src/tools/globePanel.js

@@ -48,7 +48,7 @@ const LOAD_TIMEOUT_MS = 90_000;
  */
 const PANEL_APP_BASE_URL = 'https://app.gods-eye-view.invalid/';
 /** The panel-only tool the panel loads the app through. */
-const PANEL_REQUEST_TOOL = 'panel_request';
+export const PANEL_REQUEST_TOOL = 'panel_request';
 
 /**
  * The panel page: its status line, the Open in God's Eye View button, and

src/tools/queries/panelRequest.js

@@ -7,6 +7,7 @@
  */
 
 import { defineTool, ToolError } from '../catalog.js';
+import { PANEL_REQUEST_TOOL } from '../globePanel.js';
 
 /** Bytes of response body per call, before base64. */
 export const PANEL_PART_BYTES = 512 * 1024;
@@ -83,7 +84,7 @@ function checkedPath(path) {
 }
 
 export const panelRequest = defineTool({
-  name: 'panel_request',
+  name: PANEL_REQUEST_TOOL,
   title: "God's Eye View panel request",
   description:
     "Loads a file or data for the God's Eye View panel from the app's " +