fix: add error toast to invite creation failure

When invite creation failed, the error was only logged to console.
Added toast.error() to give users visible feedback. Uses the existing
sonner toast import already in the file (line 25).

Fixes #920

surfsense_web/app/dashboard/[search_space_id]/team/team-content.tsx

@@ -595,6 +595,7 @@ function CreateInviteDialog({
 			});
 		} catch (error) {
 			console.error("Failed to create invite:", error);
+			toast.error("Failed to create invite. Please try again.");
 		} finally {
 			setCreating(false);
 		}