feat: Phase 17.3 — Fixed embed queue panel with collapse/expand iframe resize (OQ1 Option A)

Read-only inline queue panel below the release embed's player bar; row-jump reuses PlayRelease. ForRelease mints a taller iframe plus a postMessage resize listener for the collapse toggle; ForTrack unchanged.

DeepDrftTests/EmbedSnippetBuilderTests.cs

@@ -1,3 +1,4 @@
+using System.Text.RegularExpressions;
 using DeepDrftPublic.Client.Helpers;
 
 namespace DeepDrftTests;
@@ -5,8 +6,9 @@ namespace DeepDrftTests;
 /// <summary>
 /// Unit tests for the share-popover embed snippet (<see cref="EmbedSnippetBuilder"/>). The builder is
 /// the mode-aware half of SharePopover: track mode targets FramePlayer's TrackEntryKey param, release
-/// mode targets its ReleaseEntryKey param. The iframe chrome (dimensions, autoplay) must be identical
-/// across both. Pure string composition, tested directly without rendering the component.
+/// mode targets its ReleaseEntryKey param. The two snippets share width/border/autoplay chrome but
+/// diverge in height by design (Phase 17 §4.1, OQ6): the release embed is taller to show its queue
+/// panel; the track embed stays compact. Pure string composition, tested without rendering.
 /// </summary>
 [TestFixture]
 public class EmbedSnippetBuilderTests
@@ -32,7 +34,7 @@ public class EmbedSnippetBuilderTests
     }
 
     [Test]
-    public void BothModes_ShareIdenticalIframeChrome()
+    public void BothModes_ShareIdenticalNonHeightChrome()
     {
         var track = EmbedSnippetBuilder.ForTrack(BaseUri, "k");
         var release = EmbedSnippetBuilder.ForRelease(BaseUri, "k");
@@ -43,12 +45,59 @@ public class EmbedSnippetBuilderTests
             {
                 Assert.That(snippet, Does.StartWith("<iframe "));
                 Assert.That(snippet, Does.Contain(@"width=""656"""));
-                Assert.That(snippet, Does.Contain(@"height=""196"""));
                 Assert.That(snippet, Does.Contain(@"frameborder=""0"""));
                 Assert.That(snippet, Does.Contain(@"style=""border-radius:8px;"""));
                 Assert.That(snippet, Does.Contain(@"allow=""autoplay"""));
-                Assert.That(snippet, Does.EndWith("></iframe>"));
+                Assert.That(snippet, Does.Contain("</iframe>"));
             }
         });
     }
+
+    // T14 (Phase 17 §9): the release embed is taller than the track embed (it shows a queue panel),
+    // and the track embed's height is unchanged from its historical value (UC6/AC6).
+    [Test]
+    public void ForTrack_KeepsHistoricalCompactHeight()
+    {
+        var track = EmbedSnippetBuilder.ForTrack(BaseUri, "k");
+
+        Assert.That(track, Does.Contain(@"height=""196"""));
+    }
+
+    [Test]
+    public void ForRelease_IsTallerThanForTrack_ToShowQueuePanel()
+    {
+        var trackHeight = HeightOf(EmbedSnippetBuilder.ForTrack(BaseUri, "k"));
+        var releaseHeight = HeightOf(EmbedSnippetBuilder.ForRelease(BaseUri, "k"));
+
+        Assert.That(releaseHeight, Is.GreaterThan(trackHeight));
+    }
+
+    // The release snippet carries the host-side resize listener (OQ1 Option A); the track snippet,
+    // having no panel to collapse, does not.
+    [Test]
+    public void ForRelease_IncludesResizeListenerScript()
+    {
+        var release = EmbedSnippetBuilder.ForRelease(BaseUri, "k");
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(release, Does.Contain("<script>"));
+            Assert.That(release, Does.Contain("deepdrft-embed-resize"));
+        });
+    }
+
+    [Test]
+    public void ForTrack_HasNoResizeListenerScript()
+    {
+        var track = EmbedSnippetBuilder.ForTrack(BaseUri, "k");
+
+        Assert.That(track, Does.Not.Contain("<script>"));
+    }
+
+    private static int HeightOf(string snippet)
+    {
+        var match = Regex.Match(snippet, @"height=""(\d+)""");
+        Assert.That(match.Success, Is.True, "snippet must declare an iframe height");
+        return int.Parse(match.Groups[1].Value);
+    }
 }