refactor: rename AudioRecorder to PipewireAudioRecorder and update references.

Audio/PipewireAudioRecorder.cs

@@ -0,0 +1,78 @@
+using System.Diagnostics;
+
+using Toak.Core;
+using Toak.Core.Interfaces;
+
+namespace Toak.Audio;
+
+public class PipewireAudioRecorder(IRecordingStateTracker stateTracker, INotifications notifications) : IAudioRecorder
+{
+    private readonly string _wavPath = Constants.Paths.RecordingWavFile;
+    private readonly IRecordingStateTracker _stateTracker = stateTracker;
+    private readonly INotifications _notifications = notifications;
+
+    public string GetWavPath() => _wavPath;
+
+    public void StartRecording()
+    {
+        if (File.Exists(_wavPath))
+        {
+            Logger.LogDebug($"Deleting old audio file: {_wavPath}");
+            File.Delete(_wavPath);
+        }
+
+        Logger.LogDebug("Starting pw-record to record audio...");
+
+        var pInfo = new ProcessStartInfo
+        {
+            FileName = Constants.Commands.AudioRecord,
+            Arguments = $"--rate=16000 --channels=1 --format=s16 \"{_wavPath}\"",
+            UseShellExecute = false,
+            CreateNoWindow = true,
+            RedirectStandardOutput = true,
+            RedirectStandardError = true
+        };
+
+        var process = Process.Start(pInfo);
+        if (process != null)
+        {
+            _stateTracker.SetRecording(process.Id);
+            _notifications.Notify("Recording Started");
+        }
+    }
+
+    public void StopRecording()
+    {
+        var pid = _stateTracker.GetRecordingPid();
+        if (pid.HasValue)
+        {
+            Logger.LogDebug($"Found active recording process with PID {pid.Value}. Attempting to stop...");
+            try
+            {
+                var process = Process.GetProcessById(pid.Value);
+                if (!process.HasExited)
+                {
+                    // Gracefully stop pw-record using SIGINT to ensure WAV headers are finalizing cleanly
+                    Process.Start(new ProcessStartInfo
+                    {
+                        FileName = Constants.Commands.ProcessKill,
+                        Arguments = $"-INT {pid.Value}",
+                        CreateNoWindow = true,
+                        UseShellExecute = false
+                    })?.WaitForExit();
+
+                    process.WaitForExit(2000); // give it a moment to flush
+                }
+            }
+            catch (Exception ex)
+            {
+                // Process might already be dead
+                Console.WriteLine($"[PipewireAudioRecorder] Error stopping pw-record: {ex.Message}");
+            }
+            finally
+            {
+                _stateTracker.ClearRecording();
+            }
+        }
+    }
+}