Fix audio clock drift and adaptive jitter buffering

clients/windows/VoiceCat.Managed/AudioControls.cs

@@ -55,6 +55,16 @@ public sealed partial class VoiceCatClient
     public VcResult SetOutputVolume(float gain) { if (!float.IsFinite(gain) || gain is < 0 or > 4) return VcResult.InvalidArg; core.Audio.OutputGain = gain; return VcResult.Ok; }
     public VcResult SetInputGain(float gain) { if (!float.IsFinite(gain) || gain is < 0 or > 4) return VcResult.InvalidArg; core.Audio.InputGain = gain; return VcResult.Ok; }
     public VcResult SetInputNoiseReduction(bool enabled) { core.Audio.InputNoiseReduction = enabled; return VcResult.Ok; }
+    public VcResult SetAudioBufferMilliseconds(int milliseconds)
+    {
+        try
+        {
+            core.Audio.DeviceBufferMilliseconds = milliseconds;
+            if (Volatile.Read(ref playback) is { } output) output.BufferMilliseconds = milliseconds;
+            return VcResult.Ok;
+        }
+        catch (ArgumentOutOfRangeException) { return VcResult.InvalidArg; }
+    }
     public VcResult SetRemoteStream(uint userId, uint streamId, float gain, bool muted, bool nr)
     { try { core.Audio.SetRemotePlayback(userId, streamId, gain, muted, nr); return VcResult.Ok; } catch { return VcResult.InvalidArg; } }
     public (VcResult Result, RemoteStreamState? State) GetRemoteStream(uint userId, uint streamId)

clients/windows/VoiceCat.Managed/VoiceCatClient.cs

@@ -159,7 +159,11 @@ public sealed partial class VoiceCatClient : IDisposable
     {
         try
         {
-            if (backend is not null && playback is null) playback = backend.OpenPlayback();
+            if (backend is not null && playback is null)
+            {
+                playback = backend.OpenPlayback();
+                playback.BufferMilliseconds = core.Audio.DeviceBufferMilliseconds;
+            }
             var result = core.SubscribeVoiceAsync().GetAwaiter().GetResult();
             if (!result.Ok) { Interlocked.Exchange(ref playback, null)?.Dispose(); }
             return result.Ok ? VcResult.Ok : VcResult.Audio;