refactor(gui,api,logging): UI layout tweaks, cleanup, and improved diagnostics

- CbBxCamType now spans the full width of CbBxCameraModel
- BtnTest_Click moved to the bottom of AiQ_GUI.cs for easier testing/navigation
- Unused using directives removed across files
- Login credentials factored out and reused in MobileAPI.cs
- VLC.cs Capture function reviewed and superseded by TakeSnapshot
- InsertCamTab implementation updated to avoid use of `var`
- Misleading '// Non-ONVIF cameras' comment corrected
- Added Level.Debug logging, accessible only to developers, for detailed diagnostics

MobileTests/VLC.cs

@@ -0,0 +1,43 @@
+using AiQ_GUI;
+using Emgu.CV.Dai;
+using LibVLCSharp.Shared;
+using LibVLCSharp.WinForms;
+using System.IO;
+using System.Security.Policy;
+
+internal class VLC
+{
+    public static LibVLC libVLC;
+
+    static VLC()
+    {
+        // Ensure LibVLC is initialized before first use
+        Core.Initialize();
+        libVLC = new LibVLC();
+    }
+
+    public static string SnapshotPath = Path.Combine(LDS.MAVPath, "Mobile_ov_snapshot.png");
+
+    public static void Play(VideoView VLCVV)
+    {
+        var media = new Media(libVLC, $"rtsp://ADMIN:1234@{MainForm.Instance.CamOnTest.IP}:554/live/main", FromType.FromLocation); 
+
+        VLCVV.MediaPlayer.Play(media);
+    }
+
+    public static bool IsPLaying(VideoView VLCVV)
+    {
+        return VLCVV.MediaPlayer.IsPlaying;
+    }
+
+    public static void TakeSnapshot(VideoView VLCVV, string filename = "Mobile_ov_snapshot.png")
+    {
+        string path = Path.Combine(LDS.MAVPath, filename);
+        VLCVV.MediaPlayer.TakeSnapshot(0, path, 1280, 720);
+    }
+
+    public static void Stop(VideoView VLCVV)
+    {
+        VLCVV.MediaPlayer.Stop();
+    }
+}