feat: support background fill for freedraw shapes (#4610)

* feat: support background fill for freedraw shapes

* refactor & support fill style

* make filled freedraw shapes selectable from inside

* get hit test on solid freedraw shapes to somewhat work

* fix SVG export of unclosed freedraw shapes & improve types

* fix lint

* type tweaks

* reuse `hitTestCurveInside` for collision tests

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

src/scene/comparisons.ts

@@ -9,7 +9,8 @@ export const hasBackground = (type: string) =>
   type === "rectangle" ||
   type === "ellipse" ||
   type === "diamond" ||
-  type === "line";
+  type === "line" ||
+  type === "freedraw";
 
 export const hasStrokeColor = (type: string) => type !== "image";