add profile popovers

lib/helpers/extensions/show_user_popover.dart

@@ -0,0 +1,18 @@
+import "package:flutter/material.dart";
+import "package:nexus/helpers/extensions/show_context_menu.dart";
+import "package:nexus/models/membership.dart";
+import "package:nexus/widgets/chat_page/user_popover.dart";
+
+extension ShowUserPopover on BuildContext {
+  void showUserPopover(Membership member, {required Offset globalPosition}) =>
+      showContextMenu(
+        globalPosition: globalPosition,
+        children: [
+          PopupMenuItem(
+            enabled: false,
+            padding: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+            child: IconTheme(data: IconThemeData(), child: UserPopover(member)),
+          ),
+        ],
+      );
+}