refactor: rename draggingElement -> newElement (#8294)

* add newElement to appState

* freedraw should not be an editing element

* do not set editing element for freedraw and generic

* remove ununsed `appState.draggingElement`

* remove setting dragged for new linear element

* decouple selection element from new element

* fix hint for text bindables

* update snapshot

* fixes

* fix frame regressions

* add comments to types

* document `editingElement`

---------

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

packages/utils/__snapshots__/export.test.ts.snap

@@ -29,7 +29,6 @@ exports[`exportToSvg > with default arguments 1`] = `
   "currentItemTextAlign": "left",
   "cursorButton": "up",
   "defaultSidebarDockedPreference": false,
-  "draggingElement": null,
   "editingElement": null,
   "editingFrame": null,
   "editingGroupId": null,
@@ -58,6 +57,7 @@ exports[`exportToSvg > with default arguments 1`] = `
   "lastPointerDownWith": "mouse",
   "multiElement": null,
   "name": "name",
+  "newElement": null,
   "objectsSnapModeEnabled": false,
   "openDialog": null,
   "openMenu": null,