refactor(ui): extract panel disclosure lifecycle controls

scripts/format-scope.json

@@ -119,5 +119,6 @@
   "src/search/placeSearch.js",
   "src/search/google.js",
   "src/keylessGeocoder.js",
-  "src/standalone/placeSearch.js"
+  "src/standalone/placeSearch.js",
+  "src/ui/panelDisclosure.js"
 ]

scripts/package-boundaries.json

@@ -263,5 +263,10 @@
       "src/keylessGeocoder.js"
     ],
     "external": []
+  },
+  "panel-disclosure": {
+    "exports": ["./ui/panels"],
+    "modules": ["src/ui/panelDisclosure.js"],
+    "external": []
   }
 }