fix: remove max upload size from settings / use env var instead to centralize the config

widget/src/constants/defaultConfig.ts

@@ -6,8 +6,13 @@
  * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
  */
 
-export const DEFAULT_CONFIG = {
+import { Config } from "../types/config.types";
+
+export const DEFAULT_CONFIG: Config = {
   apiUrl: process.env.REACT_APP_WIDGET_API_URL || "http://localhost:4000",
   channel: process.env.REACT_APP_WIDGET_CHANNEL || "console-channel",
   language: "en",
+  maxUploadSize: process.env.UPLOAD_MAX_SIZE_IN_BYTES
+    ? Number(process.env.UPLOAD_MAX_SIZE_IN_BYTES)
+    : 20 * 1024 * 1024, // 20 MB in bytes
 };