feat: camera-restore + LauncherUI UX 개선 + player fallback 강화 (#15)

camera-restore:
- IEngineStateProvider.SetCamera 반사 쓰기 (HmegDirectStateProvider)
- POST /camera/restore (BridgeHttpServer, StateRouter)
- Recorder --sidecar-url + camera_snapshot 캡처
- UiaPlayerHost.TryRestoreCamera, PlayerEngine 재생 전 복원
- 149 tests

LauncherUI (#15):
- Sidecar URL 체크박스 + 입력란 (녹화/재생 모두 연동)
- 재생 속도 슬라이더 (0.25x~4.0x, 기본 1.0x)
- 빌드 타임스탬프 타이틀바 표시
- 녹화 완료 후 RecordNameBox 초기화
- UiAnalysisWindow 추가

PlayerEngine (#15):
- CancellationToken 지원 (중단 버튼 동작)
- Focus 스텝 early return (no-op, issue #11)
- Type/Drag unresolvable UIA path fallback
- SpeedMultiplier 옵션

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/Recordingtest.Player.Tests/PlayerEngineTests.cs

@@ -273,6 +273,107 @@ steps:
         Assert.Equal("ctrl+c", host.Hotkeys[0]);
     }
 
+    // ---- camera restore -------------------------------------------------------
+
+    [Fact]
+    public void CameraRestore_NoCameraSnapshot_HostNotCalled()
+    {
+        var engine = new PlayerEngine(new PlayerEngineOptions { PreserveTiming = false });
+        var host = new FakePlayerHost();
+        var scenario = new Scenario
+        {
+            Steps = { new Step { Kind = StepKind.Type, Value = "x" } },
+            CameraSnapshot = null,
+        };
+
+        engine.Run(scenario, host);
+
+        Assert.Empty(host.CameraRestoreCalls);
+    }
+
+    [Fact]
+    public void CameraRestore_HasCameraSnapshot_HostCalledWithCorrectValues()
+    {
+        var engine = new PlayerEngine(new PlayerEngineOptions { PreserveTiming = false });
+        var host = new FakePlayerHost { CameraRestoreResult = true };
+        var scenario = new Scenario
+        {
+            Steps = { new Step { Kind = StepKind.Type, Value = "x" } },
+            CameraSnapshot = new ScenarioCameraSnapshot
+            {
+                Eye    = new[] { 1.0, 2.0, 3.0 },
+                Target = new[] { 4.0, 5.0, 6.0 },
+                Up     = new[] { 0.0, 1.0, 0.0 },
+                Fov    = 60.0,
+            },
+        };
+
+        engine.Run(scenario, host);
+
+        Assert.Single(host.CameraRestoreCalls);
+        var call = host.CameraRestoreCalls[0];
+        Assert.Equal(new[] { 1.0, 2.0, 3.0 }, call.Eye);
+        Assert.Equal(new[] { 4.0, 5.0, 6.0 }, call.Target);
+        Assert.Equal(new[] { 0.0, 1.0, 0.0 }, call.Up);
+        Assert.Equal(60.0, call.Fov);
+    }
+
+    [Fact]
+    public void CameraRestore_HostReturnsFalse_PlaybackContinues()
+    {
+        var engine = new PlayerEngine(new PlayerEngineOptions { PreserveTiming = false });
+        var host = new FakePlayerHost { CameraRestoreResult = false };
+        var scenario = new Scenario
+        {
+            Steps =
+            {
+                new Step { Kind = StepKind.Type, Value = "BOX" },
+                new Step { Kind = StepKind.Hotkey, Value = "enter" },
+            },
+            CameraSnapshot = new ScenarioCameraSnapshot
+            {
+                Eye = new[] { 0.0, 0.0, 10.0 },
+                Target = new double[3],
+                Up = new[] { 0.0, 1.0, 0.0 },
+                Fov = 45.0,
+            },
+        };
+
+        engine.Run(scenario, host);
+
+        // Even though restore returned false, all steps should still run
+        Assert.Single(host.Types);
+        Assert.Equal("BOX", host.Types[0]);
+        Assert.Single(host.Hotkeys);
+        Assert.Empty(host.Failures);
+    }
+
+    [Fact]
+    public void ScenarioLoader_ParsesCameraSnapshot()
+    {
+        const string yaml = """
+name: with-camera
+camera_snapshot:
+  eye: [1.0, 2.0, 3.0]
+  target: [4.0, 5.0, 6.0]
+  up: [0.0, 1.0, 0.0]
+  fov: 60.0
+steps: []
+""";
+        var s = ScenarioLoader.LoadFromString(yaml);
+        Assert.NotNull(s.CameraSnapshot);
+        Assert.Equal(new[] { 1.0, 2.0, 3.0 }, s.CameraSnapshot!.Eye);
+        Assert.Equal(60.0, s.CameraSnapshot.Fov);
+    }
+
+    [Fact]
+    public void ScenarioLoader_NoCameraSnapshot_ReturnsNull()
+    {
+        const string yaml = "name: no-camera\nsteps: []\n";
+        var s = ScenarioLoader.LoadFromString(yaml);
+        Assert.Null(s.CameraSnapshot);
+    }
+
     private static string LocateEngineSource([CallerFilePath] string here = "")
     {
         // here = .../tests/Recordingtest.Player.Tests/PlayerEngineTests.cs