Rebrand to iiEasy: naming, logo, l10n, docs, assets

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/shared/services/brand_service.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import '../theme/theme_extensions.dart';
 import 'package:flutter/cupertino.dart';
+import 'package:flutter_svg/flutter_svg.dart';
 import 'dart:io' show Platform;
 import '../theme/color_tokens.dart';
 import '../theme/tweakcn_themes.dart';
@@ -97,6 +98,21 @@ class BrandService {
     return iconWidget;
   }
 
+  /// iiEasy logo image (SVG): light theme uses logo.svg, dark uses logo_dark.svg.
+  static Widget createLogoImage({
+    required double size,
+    BuildContext? context,
+  }) {
+    final isDark = context != null && Theme.of(context).brightness == Brightness.dark;
+    final asset = isDark ? 'assets/icons/logo_dark.svg' : 'assets/icons/logo.svg';
+    return SvgPicture.asset(
+      asset,
+      width: size,
+      height: size,
+      fit: BoxFit.contain,
+    );
+  }
+
   /// Creates a branded avatar with the hub icon
   static Widget createBrandAvatar({
     double size = 40,