test: add Web TelegramSessionBatchRenderer tests

Mirrors the Bot renderer tests for the duplicated Web renderer so both
Telegram consumers are covered against regressions.

tests/GmRelay.Bot.Tests/Web/Rendering/WebTelegramSessionBatchRendererTests.cs

@@ -0,0 +1,81 @@
+using GmRelay.Shared.Domain;
+using GmRelay.Shared.Rendering;
+using GmRelay.Web.Services;
+
+namespace GmRelay.Bot.Tests.Web.Rendering;
+
+public sealed class WebTelegramSessionBatchRendererTests
+{
+    [Fact]
+    public void Render_ShouldShowStructuredGameCard()
+    {
+        var sessionId = Guid.NewGuid();
+        var sessions = new[]
+        {
+            new SessionBatchDto(
+                sessionId,
+                new DateTime(2026, 6, 13, 16, 0, 0, DateTimeKind.Utc),
+                SessionStatus.Planned,
+                4,
+                "https://vtt.example/game",
+                "Hybrid",
+                "Moscow, Kubik Bar",
+                "Mystery one-shot in Bamberg.",
+                "D\u0026D 5e",
+                240,
+                true)
+        };
+        var participants = new[]
+        {
+            new ParticipantBatchDto(sessionId, "Alice", "alice", ParticipantRegistrationStatus.Active),
+            new ParticipantBatchDto(sessionId, "Bob", null, ParticipantRegistrationStatus.Waitlisted)
+        };
+
+        var view = SessionBatchViewBuilder.Build("Structured Test", sessions, participants);
+        var (text, markup) = TelegramSessionBatchRenderer.Render(view);
+
+        Assert.Contains("🏷", text);
+        Assert.Contains("Система:", text);
+        Assert.Contains("D\u0026amp;D 5e", text);
+        Assert.Contains("Формат:", text);
+        Assert.Contains("Hybrid", text);
+        Assert.Contains("Тип:", text);
+        Assert.Contains("One-shot", text);
+        Assert.Contains("⏱", text);
+        Assert.Contains("Длительность:", text);
+        Assert.Contains("4 ч", text);
+        Assert.Contains("📝", text);
+        Assert.Contains("Описание:", text);
+        Assert.Contains("Mystery one-shot in Bamberg.", text);
+        Assert.Contains("🔗", text);
+        Assert.Contains("Ссылка:", text);
+        Assert.Contains("📍", text);
+        Assert.Contains("Адрес:", text);
+        Assert.Contains("@alice", text);
+        Assert.Contains("Bob", text);
+        Assert.Contains("Лист ожидания", text);
+
+        var buttons = markup.InlineKeyboard.SelectMany(row => row).ToList();
+        Assert.Equal(2, buttons.Count);
+    }
+
+    [Fact]
+    public void Render_ShouldHandleMissingOptionalFields()
+    {
+        var sessionId = Guid.NewGuid();
+        var sessions = new[] { new SessionBatchDto(sessionId, DateTime.UtcNow, SessionStatus.Planned, 4, "") };
+        var participants = Array.Empty<ParticipantBatchDto>();
+
+        var view = SessionBatchViewBuilder.Build("Minimal", sessions, participants);
+        var (text, _) = TelegramSessionBatchRenderer.Render(view);
+
+        Assert.Contains("📅", text);
+        Assert.Contains("👥", text);
+        Assert.DoesNotContain("Система:", text);
+        Assert.DoesNotContain("Формат:", text);
+        Assert.DoesNotContain("Длительность:", text);
+        Assert.DoesNotContain("Описание:", text);
+        Assert.DoesNotContain("Ссылка:", text);
+        Assert.DoesNotContain("Адрес:", text);
+    }
+}