Refactor (#862)

* Initial factoring out of parts of the LayerUI component

2360 → 2224 LOC

* Create a Section component

* Break up src/index.tsx

* Refactor actions to reduce duplication, fix CSS

Also consolidate icons

* Move scene/data.ts to its own directory

* Fix accidental reverts, banish further single-character variables

* ACTIVE_ELEM_COLOR → ACTIVE_ELEMENT_COLOR

* Further refactoring the icons file

* Log all errors

* Pointer Event polyfill to make the tests work

* add test hooks & fix tests

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

src/components/ExportDialog.tsx

@@ -22,7 +22,7 @@ import useIsMobile from "../is-mobile";
 const scales = [1, 2, 3];
 const defaultScale = scales.includes(devicePixelRatio) ? devicePixelRatio : 1;
 
-type ExportCB = (
+export type ExportCB = (
   elements: readonly ExcalidrawElement[],
   scale?: number,
 ) => void;
@@ -173,7 +173,7 @@ function ExportModal({
                     name="export-canvas-scale"
                     aria-label={`Scale ${s} x`}
                     id="export-canvas-scale"
-                    checked={scale === s}
+                    checked={s === scale}
                     onChange={() => setScale(s)}
                   />
                 ))}