fix(analytics): use Android ID and persist UUID fallbacks (#1624)

ui/flutter/lib/api/model/downloader_config.dart

@@ -196,7 +196,9 @@ class ExtraConfig {
   List<String> createHistory;
   bool runAsMenubarApp;
   bool analyticsEnabled;
-  String analyticsClientId;
+
+  /// Persisted UUID fallback; IDs returned by platform APIs are not stored here.
+  String deviceId;
 
   ExtraConfig({
     this.themeMode = '',
@@ -214,7 +216,7 @@ class ExtraConfig {
     this.createHistory = const [],
     this.runAsMenubarApp = false,
     this.analyticsEnabled = true,
-    this.analyticsClientId = '',
+    this.deviceId = '',
   }) : windowState = windowState ?? WindowStateConfig();
 
   factory ExtraConfig.fromJson(Map<String, dynamic>? json) =>

ui/flutter/lib/api/model/downloader_config.g.dart

@@ -193,7 +193,7 @@ ExtraConfig _$ExtraConfigFromJson(Map<String, dynamic> json) => ExtraConfig(
   createHistory: (json['createHistory'] as List<dynamic>?)?.map((e) => e as String).toList() ?? const [],
   runAsMenubarApp: json['runAsMenubarApp'] as bool? ?? false,
   analyticsEnabled: json['analyticsEnabled'] as bool? ?? true,
-  analyticsClientId: json['analyticsClientId'] as String? ?? '',
+  deviceId: json['deviceId'] as String? ?? '',
 );
 
 Map<String, dynamic> _$ExtraConfigToJson(ExtraConfig instance) => <String, dynamic>{
@@ -212,7 +212,7 @@ Map<String, dynamic> _$ExtraConfigToJson(ExtraConfig instance) => <String, dynam
   'createHistory': instance.createHistory,
   'runAsMenubarApp': instance.runAsMenubarApp,
   'analyticsEnabled': instance.analyticsEnabled,
-  'analyticsClientId': instance.analyticsClientId,
+  'deviceId': instance.deviceId,
 };
 
 WindowStateConfig _$WindowStateConfigFromJson(Map<String, dynamic> json) => WindowStateConfig(