Refactor: CSS handling (#2344)

* refactor(css): only load base styles, add css task, cleanup exports
* style(base): add edge label bg
* refactor(css): use css-utils
* feat(core): add Panel component
* refactor(background): cleanup
* refactor(css-handling): cleanup

packages/controls/package.json

@@ -1,12 +1,13 @@
 {
   "name": "@react-flow/controls",
   "version": "11.0.0",
-  "description": "A component that controls the viewport of React Flow",
+  "description": "A component to control the viewport of a React Flow instance",
   "main": "dist/react-flow-controls.cjs.js",
   "module": "dist/react-flow-controls.esm.js",
   "license": "MIT",
   "dependencies": {
-    "@react-flow/core": "11.0.0",
+    "@react-flow/core": "^11.0.0",
+    "@react-flow/css-utils": "^11.0.0",
     "classcat": "^5.0.3"
   },
   "peerDependencies": {