ui(mapillary): drop the keyless empty state

The panel no longer shows a separate keyless call-to-action; the fieldset
gate and the layer-row tooltip already cover the missing-key case. The
planner flag is tri-state (null until status answers).

Co-Authored-By: Claude Fable 5.1 <[email protected]>

src/ui/applicationShell.js

@@ -900,7 +900,6 @@ export class StyleManager extends ShellFacade {
           }),
         setPanelCollapsed: (collapsed, options) =>
           this.setPanelCollapsed('mapillary-panel', collapsed, options),
-        openKeySetup: () => document.getElementById('key-setup-chip')?.click(),
         showToast: (message) => this._showToast(message),
       },
     });