chore: Initial commit

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XPovRHpejR4zRxuhjY4Qs3

lib/services/voice_bitrate_preferences.dart

@@ -0,0 +1,52 @@
+import 'package:shared_preferences/shared_preferences.dart';
+import 'profiles_feature_service.dart';
+import '../utils/voice_message_parser.dart';
+
+/// Stores user-selected voice bitrate and maps it to supported codec modes.
+class VoiceBitratePreferences {
+  static const String _bitrateKey = 'voice_bitrate';
+  static const int defaultBitrate = 1300;
+  static const List<int> supportedBitrates = [
+    700,
+    1200,
+    1300,
+    1400,
+    1600,
+    2400,
+    3200,
+  ];
+
+  static Future<int> getBitrate() async {
+    final prefs = await SharedPreferences.getInstance();
+    final value =
+        prefs.getInt(ProfileStorageScope.scopedKey(_bitrateKey)) ??
+        defaultBitrate;
+    return supportedBitrates.contains(value) ? value : defaultBitrate;
+  }
+
+  static Future<void> setBitrate(int bitrate) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setInt(ProfileStorageScope.scopedKey(_bitrateKey), bitrate);
+  }
+
+  static VoicePacketMode toVoiceMode(int bitrate) {
+    switch (bitrate) {
+      case 1200:
+        return VoicePacketMode.mode1200;
+      case 1300:
+        return VoicePacketMode.mode1300;
+      case 1400:
+        return VoicePacketMode.mode1400;
+      case 1600:
+        return VoicePacketMode.mode1600;
+      case 2400:
+        return VoicePacketMode.mode2400;
+      case 3200:
+        return VoicePacketMode.mode3200;
+      case 700:
+        return VoicePacketMode.mode700c;
+      default:
+        return VoicePacketMode.mode1300;
+    }
+  }
+}