add profile popovers

lib/helpers/extensions/scheme_to_theme.dart

@@ -7,6 +7,15 @@ extension SchemeToTheme on ColorScheme {
       titleSpacing: 0,
       backgroundColor: surfaceContainerLow,
     ),
+    menuTheme: MenuThemeData(
+      style: MenuStyle(
+        backgroundColor: WidgetStatePropertyAll(primaryContainer),
+      ),
+    ),
+    chipTheme: ChipThemeData(
+      labelStyle: TextStyle(color: onPrimary),
+      color: WidgetStatePropertyAll(primary),
+    ),
     textTheme: ThemeData(
       fontFamilyFallback: ["sans", "emoji"],
       brightness: brightness,

lib/helpers/extensions/show_context_menu.dart

@@ -9,6 +9,7 @@ extension ShowContextMenu on BuildContext {
 
     showMenu(
       context: this,
+      constraints: BoxConstraints.loose(Size.infinite),
       position: RelativeRect.fromLTRB(
         globalPosition.dx,
         globalPosition.dy,

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)),
+          ),
+        ],
+      );
+}