feat: add user admin status and profile management

- Updated user schema to include isAdmin field.
- Enhanced authentication hooks to fetch and set user admin status.
- Created ProfileButton component for user profile actions.
- Implemented profile and password update functionality.
- Added session management for user accounts.
- Developed login and signup pages with form handling.
- Introduced layout server for user session data.
- Updated daily page to reflect character changes.

src/app.d.ts

@@ -1,18 +1,11 @@
 import type { User, Session } from 'better-auth/minimal';
 
-// See https://svelte.dev/docs/kit/types#app.d.ts
-// for information about these interfaces
 declare global {
 	namespace App {
 		interface Locals {
-			user?: User;
+			user?: User & { isAdmin?: boolean };
 			session?: Session;
 		}
-
-		// interface Error {}
-		// interface PageData {}
-		// interface PageState {}
-		// interface Platform {}
 	}
 }