fix(list-sessions): clarify manager action button labels

The /listsessions buttons for owners/co-GMs only showed emoji + date,
so it was unclear what each button did. Add explicit verb labels:
- ❌ Отменить <date>
- ⏰ Перенести <date>
- ⬆️ С ожидания <date>
- 🗑 Удалить <date>

Update the renderer test to assert the new labels.

src/GmRelay.Bot/Features/Sessions/ListSessions/SessionListMessageRenderer.cs

@@ -36,19 +36,19 @@ internal static class SessionListMessageRenderer
 
             actions.Add(new PlatformMessageAction(
                 $"cancel_session:{session.Id}",
-                $"❌ {dateTitle}",
+                $"❌ Отменить {dateTitle}",
                 $"cancel_session:{session.Id}"));
 
             actions.Add(new PlatformMessageAction(
                 $"reschedule_session:{session.Id}",
-                $"⏰ {dateTitle}",
+                $"⏰ Перенести {dateTitle}",
                 $"reschedule_session:{session.Id}"));
 
             if (SessionCapacityRules.CanPromoteWaitlistedPlayer(session.MaxPlayers, session.PlayerCount, session.WaitlistCount))
             {
                 actions.Add(new PlatformMessageAction(
                     $"promote_waitlist:{session.Id}",
-                    $"⬆️ Из ожидания {dateTitle}",
+                    $"⬆️ С ожидания {dateTitle}",
                     $"promote_waitlist:{session.Id}"));
             }