feat: Refactor API interactions and enhance user settings management

- Updated ezpp API to include user info retrieval and improved error handling.
- Introduced new writable stores for current user info and loading states.
- Added gamemode enums and utility functions for better gamemode handling.
- Refactored global state management to use consistent naming conventions.
- Enhanced loading and login components to provide better user feedback.
- Updated user settings to include preferred mode and type.
- Improved layout and page components for better state management and user experience.

src/lib/data.ts

@@ -0,0 +1,4 @@
+import { writable } from 'svelte/store';
+import type { EZPPUserInfo } from './types';
+
+export const currentUserInfo = writable<EZPPUserInfo | undefined>(undefined);