better structure

config/quickshell/Services/ThemeIcons.qml

@@ -0,0 +1,46 @@
+import QtQuick
+import Quickshell
+pragma Singleton
+
+Singleton {
+    // ignore and fall back
+
+    id: root
+
+    function iconFromName(iconName, fallbackName) {
+        const fallback = fallbackName || "application-x-executable";
+        try {
+            if (iconName && typeof Quickshell !== 'undefined' && Quickshell.iconPath) {
+                const p = Quickshell.iconPath(iconName, fallback);
+                if (p && p !== "")
+                    return p;
+
+            }
+        } catch (e) {
+        }
+        try {
+            return Quickshell.iconPath ? (Quickshell.iconPath(fallback, true) || "") : "";
+        } catch (e2) {
+            return "";
+        }
+    }
+
+    // Resolve icon path for a DesktopEntries appId - safe on missing entries
+    function iconForAppId(appId, fallbackName) {
+        const fallback = fallbackName || "application-x-executable";
+        if (!appId)
+            return iconFromName(fallback, fallback);
+
+        try {
+            if (typeof DesktopEntries === 'undefined' || !DesktopEntries.byId)
+                return iconFromName(fallback, fallback);
+
+            const entry = (DesktopEntries.heuristicLookup) ? DesktopEntries.heuristicLookup(appId) : DesktopEntries.byId(appId);
+            const name = entry && entry.icon ? entry.icon : "";
+            return iconFromName(name || fallback, fallback);
+        } catch (e) {
+            return iconFromName(fallback, fallback);
+        }
+    }
+
+}