chore: in invite page, display different text in public user list is empty and user has searched (#5885)

lib/l10n/intl_en.arb

@@ -5389,5 +5389,6 @@
       }
     }
   },
-  "youSentActivitySummary": "You sent an activity summary"
+  "youSentActivitySummary": "You sent an activity summary",
+  "emptyInviteSearchHint": "Don't see who you're looking for? They may need to set their profile to public in Learning Settings"
 }

lib/pangea/chat_settings/pages/pangea_invitation_selection.dart

@@ -90,6 +90,7 @@ class PangeaInvitationSelectionController
 
   List<Profile> foundProfiles = [];
   Timer? coolDown;
+  String? lastSearch;
 
   InvitationFilter filter = InvitationFilter.knocking;
 
@@ -369,7 +370,10 @@ class PangeaInvitationSelectionController
       setState(() => foundProfiles = []);
     }
 
-    setState(() => loading = true);
+    setState(() {
+      loading = true;
+      lastSearch = null;
+    });
     final matrix = Matrix.of(context);
     SearchUserDirectoryResponse response;
     try {
@@ -380,7 +384,10 @@ class PangeaInvitationSelectionController
       ).showSnackBar(SnackBar(content: Text((e).toLocalizedString(context))));
       return;
     } finally {
-      setState(() => loading = false);
+      setState(() {
+        loading = false;
+        lastSearch = text;
+      });
     }
 
     final results = response.results;

lib/pangea/chat_settings/pages/pangea_invitation_selection_view.dart

@@ -156,7 +156,11 @@ class PangeaInvitationSelectionView extends StatelessWidget {
                               ? Padding(
                                   padding: const EdgeInsets.all(24.0),
                                   child: Text(
-                                    room.isSpace
+                                    controller.controller.text.isNotEmpty &&
+                                            controller.controller.text ==
+                                                controller.lastSearch
+                                        ? L10n.of(context).emptyInviteSearchHint
+                                        : room.isSpace
                                         ? L10n.of(context).publicInviteDescSpace
                                         : L10n.of(context).publicInviteDescChat,
                                   ),