fix: Escape regex for embeds (#3907)

Fixes #3899

shared/editor/embeds/Descript.test.ts

@@ -0,0 +1,10 @@
+import Descript from "./Descript";
+
+describe("Descript", () => {
+  const match = Descript.ENABLED[0];
+
+  test("to not be enabled elsewhere", () => {
+    expect("https://shareddescript.com/view/c9d8".match(match)).toBe(null);
+    expect("https://share.descriptdcom/view/c9d8".match(match)).toBe(null);
+  });
+});