✨ chore(scripts/utils, scripts/style-handler): add filter() method, change stylesheet target directory

the `filter()` function can both filter a common array and at the same time, it can also filter an Accessor Array(Accessor<Array<T>> and return an Accessor when provided Array is an Accessor Array. Stylesheet directory changed to colorshell's cache dir, making sense, since it's a temporary file generated by the shell

ags/scripts/stylesheet.ts

@@ -12,9 +12,11 @@ import GLib from "gi://GLib?version=2.0";
 export class Stylesheet {
     private static instance: Stylesheet;
     #watchDelay: (AstalIO.Time|undefined);
-    #outputPath = Gio.File.new_for_path(`${GLib.get_user_state_dir()}/ags/style`);
+    #outputPath = Gio.File.new_for_path(`${GLib.get_user_cache_dir()}/colorshell/style`);
     #styles = [ "./style", "./style.scss" ];
 
+    public get stylePath() { return this.#outputPath.get_path()!; }
+
     public async compileSass(): Promise<void> {
         console.log("Stylesheet: Compiling Sass");