Refactor authentication system with tier-based access control

- Replace group-based auth with user/board/admin tier system
- Add direct login functionality alongside OAuth
- Implement role-based middleware for route protection
- Create dashboard pages and admin API endpoints
- Add error handling page and improved user management
- Maintain backward compatibility with legacy role methods

utils/types.ts

@@ -3,8 +3,11 @@ export interface User {
   id: string;
   email: string;
   name: string;
-  groups?: string[];
-  tier?: string;
+  firstName?: string;
+  lastName?: string;
+  username?: string;
+  tier: 'user' | 'board' | 'admin';
+  groups: string[];
 }
 
 export interface AuthState {
@@ -60,23 +63,19 @@ export interface UserInfo {
   given_name?: string;
   family_name?: string;
   name?: string;
+  preferred_username?: string;
   groups?: string[];
   tier?: string;
 }
 
 export interface SessionData {
-  user: {
-    id: string;
-    email: string;
-    name: string;
-    groups?: string[];
-    tier?: string;
-  };
+  user: User;
   tokens: {
     accessToken: string;
     refreshToken: string;
     expiresAt: number;
   };
+  rememberMe?: boolean;
   createdAt: number;
   lastActivity: number;
 }