fix(core): fixed typos for custom properties

Author: mlaursen

.changeset/polite-spoons-report.md

@@ -0,0 +1,5 @@
+---
+"@react-md/core": patch
+---
+
+Fixed the custom css properties for window-splitter and max width transition.

packages/core/src/transition/useMaxWidthTransition.ts

@@ -7,7 +7,7 @@ import { Children, cloneElement, isValidElement } from "react";
 import { maxWidthTransition } from "./maxWidthTransition.js";
 
 declare module "react" {
-  interface CSSProperites {
+  interface CSSProperties {
     "--rmd-max-width"?: string | number;
     "--rmd-max-width-gap"?: string | number;
   }

packages/core/src/window-splitter/styles.ts

@@ -12,8 +12,8 @@ declare module "react" {
     "--rmd-window-splitter-y"?: string | number;
     "--rmd-window-splitter-z"?: string | number;
     "--rmd-window-splitter-position"?: string | number;
-    "--rmd-window-splitter-backgrond-color"?: string;
-    "--rmd-window-splitter-inactive-backgrond-color"?: string;
+    "--rmd-window-splitter-background-color"?: string;
+    "--rmd-window-splitter-inactive-background-color"?: string;
     "--rmd-window-splitter-opacity"?: string | number;
   }
 }