Add configuration files and update authentication service error handling

- Introduced .vscode/settings.json and .vscode/launch.json for IDE configuration.
- Updated DebugAuthInterface and ArcaneAuthenticationService to return const Result.ok() for consistency.
- Added ArcaneTheme class for theme management.
- Updated pubspec.yaml to change result_monad dependency version.
- Modified authentication_service_test to return const Result.ok() in mock setups.

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/src/services/reactive_theme/arcane_theme.dart

@@ -0,0 +1,26 @@
+import "package:flutter/material.dart";
+
+class ArcaneTheme extends InheritedWidget {
+  final ThemeMode themeMode;
+  final bool followSystem;
+  final ThemeData? theme;
+
+  const ArcaneTheme({
+    required super.child,
+    this.themeMode = ThemeMode.light,
+    this.followSystem = false,
+    this.theme,
+    super.key,
+  });
+
+  static ArcaneTheme? of(BuildContext context) {
+    return context.dependOnInheritedWidgetOfExactType<ArcaneTheme>();
+  }
+
+  @override
+  bool updateShouldNotify(ArcaneTheme oldWidget) {
+    return themeMode != oldWidget.themeMode ||
+        followSystem != oldWidget.followSystem ||
+        theme != oldWidget.theme;
+  }
+}