feat: Add logger service and improve expense dialog with enhanced receipt management and calculation logic.

lib/services/logger_service.dart

@@ -0,0 +1,30 @@
+import 'dart:developer' as developer;
+
+class LoggerService {
+  static void log(String message, {String name = 'App'}) {
+    developer.log(message, name: name);
+  }
+
+  static void error(
+    String message, {
+    String name = 'App',
+    Object? error,
+    StackTrace? stackTrace,
+  }) {
+    developer.log(
+      message,
+      name: name,
+      error: error,
+      stackTrace: stackTrace,
+      level: 1000,
+    );
+  }
+
+  static void info(String message, {String name = 'App'}) {
+    developer.log(message, name: name, level: 800);
+  }
+
+  static void warning(String message, {String name = 'App'}) {
+    developer.log(message, name: name, level: 900);
+  }
+}