refactor(shared): extract reschedule voting types to Shared

src/GmRelay.Bot/Features/Sessions/RescheduleSession/HandleRescheduleTimeInputHandler.cs

@@ -1,6 +1,7 @@
 using Dapper;
 using GmRelay.Bot.Features.Notifications;
 using GmRelay.Shared.Domain;
+using GmRelay.Shared.Features.Sessions.RescheduleSession;
 using GmRelay.Shared.Platform;
 using GmRelay.Shared.Rendering;
 using Npgsql;
@@ -17,12 +18,6 @@ internal sealed record AwaitingProposalDto(
     Guid Id, Guid SessionId, string Title, DateTime CurrentScheduledAt,
     Guid BatchId, int? BatchMessageId, long TelegramChatId, int? ThreadId, string NotificationMode);
 
-internal sealed record VoteParticipantDto(
-    Guid PlayerId,
-    string DisplayName,
-    string? TelegramUsername,
-    long TelegramId = 0);
-
 // ── Handler ──────────────────────────────────────────────────────────
 
 /// <summary>