Feature/microphone recording

[AnKh99]

Description

This PR adds support for microphone audio recording alongside system audio, adds a toggle in the Preferences menu, and introduces a mute/unmute button in the active recording overlay.

Key Changes

1. Preferences & AppPreferences:
   • Added a new Capture microphone toggle in the Recording settings tab.
2. Audio Capture & Multi-track Recording:
   • Integrated AVCaptureSession to capture the default microphone input device.
   • Configured AVCaptureAudioDataOutput to convert input to a standard PCM format (48kHz, 16-bit, mono) to prevent encoding mismatches and loud white/static noise.
   • Added a secondary audio input track (micInput) to RecordingSession to output multi-track audio inside the .mp4 file.
3. Interactive Mute/Unmute:
   • Added a microphone mute/unmute button to the active recording overlay toolbar.
   • Mutes the audio stream by zeroing PCM bytes in real-time while preserving sample timestamps (preventing audio/video desync).
4. macOS Security & Sandboxing:
   • Added NSMicrophoneUsageDescription to Info.plist and com.apple.security.device.audio-input to entitlements to prevent TCC crashes on launch.

Note: This PR is stacked on top of my previous PR (Auto-select screen #67). Once that PR is merged, this PR will automatically update to show only the microphone changes.

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