feat: show a mid point for linear elements (#5534)

* feat: Add a mid point for linear elements

* fix tests

* show mid point only on hover

* hacky fix :(

* don't add mid points if present and only add outside editor

* improve styling and always show phantom point instead of just on hover

* fix tests

* fix

* only add polyfill for test

* add hover state for phantom point

* fix tests

* fix

* Add Array.at polyfill

* reuse `centerPoint()` helper

* reuse `distance2d`

* use `Point` type

Co-authored-by: dwelle <luzar.david@gmail.com>

src/setupTests.ts

@@ -1,8 +1,9 @@
 import "@testing-library/jest-dom";
 import "jest-canvas-mock";
-
 import dotenv from "dotenv";
+import polyfill from "./polyfill";
 
+polyfill();
 // jest doesn't know of .env.development so we need to init it ourselves
 dotenv.config({
   path: require("path").resolve(__dirname, "../.env.development"),