feat(app): clean architecture with typed repositories, DTO models and calendar event logos

FinlyticApp/lib/core/widgets/asset_logo_widget.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
+import 'package:cached_network_image/cached_network_image.dart';
 import '../network/api_client.dart';
 import '../theme/app_theme.dart';
 
@@ -24,7 +25,13 @@ class AssetLogoWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     // Resolve relative URLs (e.g. /api/v1/logo/...) to include host and port (e.g. http://localhost:5000)
     String? resolveUrl(String? url) {
-      if (url == null || url.isEmpty) return null;
+      if (url == null || url.isEmpty) {
+        final clean = symbolOrName.trim();
+        if (RegExp(r'^[A-Z]{2}[A-Z0-9]{9}[0-9]$').hasMatch(clean)) {
+          return '${ApiClient.baseUrl}/api/v1/logo/$clean';
+        }
+        return null;
+      }
       if (url.startsWith('http://') || url.startsWith('https://')) return url;
       return url.startsWith('/') ? '${ApiClient.baseUrl}$url' : '${ApiClient.baseUrl}/$url';
     }
@@ -65,12 +72,13 @@ class AssetLogoWidget extends StatelessWidget {
               return _buildFallback(initial, colors);
             },
           )
-              : Image.network(
-            image,
+              : CachedNetworkImage(
+            imageUrl: image,
             width: size,
             height: size,
             fit: BoxFit.contain,
-            errorBuilder: (context, error, stackTrace) {
+            placeholder: (context, url) => _buildFallback(initial, colors),
+            errorWidget: (context, url, error) {
               _failedUrls.add(image);
               return _buildFallback(initial, colors);
             },