completed ui for current user apps

lib/utils/set_extension.dart

@@ -0,0 +1,14 @@
+extension SetExtension<T> on Set<T> {
+  int indexOf(T el) {
+    if (contains(el)) {
+      int idx = 0;
+      for (final e in this) {
+        if (e == el) {
+          return idx;
+        }
+        idx++;
+      }
+    }
+    return -1;
+  }
+}