chore(monorepo): relocate client files

apps/client/src/services/css_class_manager.ts

@@ -0,0 +1,28 @@
+const registeredClasses = new Set<string>();
+
+function createClassForColor(color: string | null) {
+    if (!color?.trim()) {
+        return "";
+    }
+
+    const normalizedColorName = color.replace(/[^a-z0-9]/gi, "");
+
+    if (!normalizedColorName.trim()) {
+        return "";
+    }
+
+    const className = `color-${normalizedColorName}`;
+
+    if (!registeredClasses.has(className)) {
+        // make the active fancytree selector more specific than the normal color setting
+        $("head").append(`<style>.${className}, span.fancytree-active.${className} { color: ${color} !important; }</style>`);
+
+        registeredClasses.add(className);
+    }
+
+    return className;
+}
+
+export default {
+    createClassForColor
+};