feat(globe): answer the clear and share actions through the globe actions store

The top-center bar is now GlobeActions.vue. The shell publishes whether a
clear is under way and answers the clear and share buttons through the
globe actions store, instead of binding listeners and writing attributes on
the buttons. A shell disposed mid-clear resets the busy state, so the next
shell's bar is not left busy. bindClearLayersControl stays exported and is
deprecated.

scripts/format-scope.json

@@ -1134,6 +1134,7 @@
   "src/ui/kit/UiButton.test.mjs",
   "src/ui/kit/UiChip.vue",
   "src/ui/kit/UiChip.test.mjs",
+  "src/ui/globeActions.test.mjs",
   "src/ui/kit/UiSelect.js",
   "src/ui/kit/UiSelect.test.mjs",
   "src/ui/kit/UiBadge.vue",