revert: "build: Migrate to Vite 🚀" (#6814)

Revert "build: Migrate to Vite 🚀 (#6713)"

This reverts commit e93bbc5776.

src/components/Sidebar/Sidebar.test.tsx

@@ -10,7 +10,6 @@ import {
   waitFor,
   withExcalidrawDimensions,
 } from "../../tests/test-utils";
-import { vi } from "vitest";
 
 export const assertSidebarDockButton = async <T extends boolean>(
   hasDockButton: T,
@@ -206,7 +205,7 @@ describe("Sidebar", () => {
     });
 
     it("<Sidebar.Header> should render close button", async () => {
-      const onStateChange = vi.fn();
+      const onStateChange = jest.fn();
       const CustomExcalidraw = () => {
         return (
           <Excalidraw

src/components/Sidebar/Sidebar.tsx

@@ -53,7 +53,7 @@ export const SidebarInner = forwardRef(
     }: SidebarProps & Omit<React.RefAttributes<HTMLDivElement>, "onSelect">,
     ref: React.ForwardedRef<HTMLDivElement>,
   ) => {
-    if (import.meta.env.DEV && onDock && docked == null) {
+    if (process.env.NODE_ENV === "development" && onDock && docked == null) {
       console.warn(
         "Sidebar: `docked` must be set when `onDock` is supplied for the sidebar to be user-dockable. To hide this message, either pass `docked` or remove `onDock`",
       );