feat: partition main canvas vertically (#6759)

Co-authored-by: Marcel Mraz <marcel.mraz@adacta-fintech.com>
Co-authored-by: dwelle <luzar.david@gmail.com>

src/element/transformHandles.ts

@@ -6,7 +6,7 @@ import {
 
 import { getElementAbsoluteCoords } from "./bounds";
 import { rotate } from "../math";
-import { AppState, Zoom } from "../types";
+import { InteractiveCanvasAppState, Zoom } from "../types";
 import { isTextElement } from ".";
 import { isFrameElement, isLinearElement } from "./typeChecks";
 import { DEFAULT_SPACING } from "../renderer/renderScene";
@@ -276,8 +276,8 @@ export const getTransformHandles = (
 };
 
 export const shouldShowBoundingBox = (
-  elements: NonDeletedExcalidrawElement[],
-  appState: AppState,
+  elements: readonly NonDeletedExcalidrawElement[],
+  appState: InteractiveCanvasAppState,
 ) => {
   if (appState.editingLinearElement) {
     return false;