fix: ensure window.matchMedia is defined as function (#138)

Co-authored-by: Hunter Johnston <64506580+huntabyte@users.noreply.github.com>

Author: kyle-leonhard

.changeset/silly-rooms-care.md

@@ -0,0 +1,5 @@
+---
+"mode-watcher": patch
+---
+
+fix: ensure `window.matchMedia` is defined as function before calling

packages/mode-watcher/src/lib/mode-states.svelte.ts

@@ -55,7 +55,7 @@ export class SystemPrefersMode {
 	#track = true;
 	#current = $state<SystemModeValue>(this.#defaultValue);
 	#mediaQueryState =
-		typeof window !== "undefined" && "matchMedia" in window
+		typeof window !== "undefined" && typeof window.matchMedia === "function"
 			? new MediaQuery("prefers-color-scheme: light")
 			: { current: false };