fix: add wayland dev headers and scanner for pywayland build on NixOS

configs/quickshell/modules/common/functions/FileUtils.qml

@@ -0,0 +1,41 @@
+pragma Singleton
+import Quickshell
+
+Singleton {
+    id: root
+
+    /**
+     * Trims the File protocol off the input string
+     * @param {string} str
+     * @returns {string}
+     */
+    function trimFileProtocol(str) {
+        return str.startsWith("file://") ? str.slice(7) : str;
+    }
+
+    /**
+     * Extracts the file name from a file path
+     * @param {string} str
+     * @returns {string}
+     */
+    function fileNameForPath(str) {
+        if (typeof str !== "string") return "";
+        const trimmed = trimFileProtocol(str);
+        return trimmed.split(/[\\/]/).pop();
+    }
+
+    /**
+     * Removes the file extension from a file path or name
+     * @param {string} str
+     * @returns {string}
+     */
+    function trimFileExt(str) {
+        if (typeof str !== "string") return "";
+        const trimmed = trimFileProtocol(str);
+        const lastDot = trimmed.lastIndexOf(".");
+        if (lastDot > -1 && lastDot > trimmed.lastIndexOf("/")) {
+            return trimmed.slice(0, lastDot);
+        }
+        return trimmed;
+    }
+}