feat: Add Eraser 🎉 (#4887)

* feat: Add Eraser 🎉

* Eraser working

* remove unused state

* fix

* toggle eraser

* Support deselect with Alt/Option

* rename actionDelete -> actionErase

* Add util isEraserActive

* show eraser in mobile

* render eraser conditionally in mobile

* use selection if eraser in local storage state

* Add sampling to erase accurately

* use pointerDownState

* set eraser to false in AllowedExcalidrawElementTypes

* rename/reword fixes

* don't use updateScene

* handle bound text when erasing

* fix hover state in mobile

* consider all hitElements instead of a single

* code improvements

* revert to select if eraser active and elements selected

* show eraser in zenmode

* erase element when clicked on element while eraser active

* set groupIds to empty when eraser active

* fix test

* remove dragged distance

src/components/LayerUI.tsx

@@ -428,6 +428,14 @@ const LayerUI = ({
                   {actionManager.renderAction("redo", { size: "small" })}
                 </div>
               )}
+              <div
+                className={clsx("eraser-buttons zen-mode-transition", {
+                  "layer-ui__wrapper__footer-left--transition-left":
+                    zenModeEnabled,
+                })}
+              >
+                {actionManager.renderAction("eraser", { size: "small" })}
+              </div>
             </Section>
           </Stack.Col>
         </div>