feat: add session capacity waitlist

src/GmRelay.Web/Components/Pages/GroupDetails.razor

@@ -20,6 +20,13 @@
         <h2>📅 Предстоящие игры</h2>
     </div>
 
+    @if (!string.IsNullOrEmpty(errorMessage))
+    {
+        <div class="gm-alert gm-alert-danger" style="margin-bottom: 1rem;">
+            ⚠️ @errorMessage
+        </div>
+    }
+
     @if (sessions == null)
     {
         <div class="glass-card" style="padding: 2rem;">
@@ -48,6 +55,7 @@
                     <tr>
                         <th>Название</th>
                         <th>Время (МСК)</th>
+                        <th>Места</th>
                         <th>Статус</th>
                         <th>Ссылка</th>
                         <th>Действие</th>
@@ -59,6 +67,7 @@
                         <tr>
                             <td style="color: var(--text-primary); font-weight: 500;">@session.Title</td>
                             <td>@session.ScheduledAt.FormatMoscow()</td>
+                            <td>@FormatSeats(session)</td>
                             <td>
                                 <span class="status-badge @GetStatusClass(session.Status)">@TranslateStatus(session.Status)</span>
                             </td>
@@ -69,9 +78,17 @@
                                 </a>
                             </td>
                             <td>
-                                <a href="/session/edit/@session.Id" class="btn-gm btn-gm-outline" style="font-size: 0.8125rem; padding: 0.375rem 0.75rem;">
-                                    ✏️ Изменить
-                                </a>
+                                <div style="display: flex; gap: 0.5rem; flex-wrap: wrap;">
+                                    <a href="/session/edit/@session.Id" class="btn-gm btn-gm-outline" style="font-size: 0.8125rem; padding: 0.375rem 0.75rem;">
+                                        ✏️ Изменить
+                                    </a>
+                                    @if (CanPromote(session))
+                                    {
+                                        <button type="button" class="btn-gm btn-gm-success" style="font-size: 0.8125rem; padding: 0.375rem 0.75rem;" disabled="@(promotingSessionId == session.Id)" @onclick="() => PromoteWaitlisted(session.Id)">
+                                            @(promotingSessionId == session.Id ? "⏳ Поднимаем..." : "⬆️ Из ожидания")
+                                        </button>
+                                    }
+                                </div>
                             </td>
                         </tr>
                     }
@@ -93,6 +110,10 @@
                             <span>🕐 Время</span>
                             <span style="color: var(--text-primary);">@session.ScheduledAt.FormatMoscow()</span>
                         </div>
+                        <div class="session-card-row">
+                            <span>👥 Места</span>
+                            <span style="color: var(--text-primary);">@FormatSeats(session)</span>
+                        </div>
                         <div class="session-card-row">
                             <span>🔗 Ссылка</span>
                             <a href="@session.JoinLink" target="_blank" rel="noopener noreferrer">Подключиться ↗</a>
@@ -102,6 +123,12 @@
                         <a href="/session/edit/@session.Id" class="btn-gm btn-gm-outline" style="flex: 1; justify-content: center; font-size: 0.8125rem; padding: 0.5rem;">
                             ✏️ Изменить
                         </a>
+                        @if (CanPromote(session))
+                        {
+                            <button type="button" class="btn-gm btn-gm-success" style="flex: 1; justify-content: center; font-size: 0.8125rem; padding: 0.5rem;" disabled="@(promotingSessionId == session.Id)" @onclick="() => PromoteWaitlisted(session.Id)">
+                                @(promotingSessionId == session.Id ? "⏳ Поднимаем..." : "⬆️ Из ожидания")
+                            </button>
+                        }
                     </div>
                 </div>
             }
@@ -112,11 +139,14 @@
 @code {
     [Parameter] public Guid GroupId { get; set; }
     private List<WebSession>? sessions;
+    private Guid? promotingSessionId;
+    private long telegramId;
+    private string? errorMessage;
 
     protected override async Task OnInitializedAsync()
     {
         var authState = await AuthStateProvider.GetAuthenticationStateAsync();
-        if (!authState.User.TryGetTelegramId(out var telegramId))
+        if (!authState.User.TryGetTelegramId(out telegramId))
         {
             Navigation.NavigateTo("/access-denied");
             return;
@@ -129,6 +159,45 @@
         }
     }
 
+    private async Task PromoteWaitlisted(Guid sessionId)
+    {
+        errorMessage = null;
+        promotingSessionId = sessionId;
+
+        try
+        {
+            await SessionService.PromoteWaitlistedPlayerForGmAsync(sessionId, telegramId);
+            sessions = await SessionService.GetUpcomingSessionsForGmAsync(GroupId, telegramId);
+        }
+        catch (SessionAccessDeniedException)
+        {
+            Navigation.NavigateTo("/access-denied");
+        }
+        catch (Exception ex)
+        {
+            errorMessage = ex.Message;
+        }
+        finally
+        {
+            promotingSessionId = null;
+        }
+    }
+
+    private static bool CanPromote(WebSession session) =>
+        session.WaitlistedPlayerCount > 0 &&
+        (!session.MaxPlayers.HasValue || session.ActivePlayerCount < session.MaxPlayers.Value);
+
+    private static string FormatSeats(WebSession session)
+    {
+        var seats = session.MaxPlayers.HasValue
+            ? $"{session.ActivePlayerCount}/{session.MaxPlayers.Value}"
+            : session.ActivePlayerCount.ToString(System.Globalization.CultureInfo.InvariantCulture);
+
+        return session.WaitlistedPlayerCount > 0
+            ? $"{seats} · ожидание {session.WaitlistedPlayerCount}"
+            : seats;
+    }
+
     private string GetStatusClass(string status) => status switch
     {
         SessionStatus.Confirmed => "status-success",