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/layers/mapillary/index.js

@@ -180,7 +180,8 @@ export function createMapillaryLayer({ source, services = {} }) {
     return {
       enabled: state.enabled,
       keyRequired: state.keyRequired,
-      planner: state.status?.planner === true,
+      // null until the status call answers (the layer initialises lazily).
+      planner: state.status ? state.status.planner === true : null,
       plannerModel: state.status?.plannerModel || null,
       coverage: {
         zoom: state.coverage.zoom,