Configure ESLint with deprecation checking and fix all lint violations

frontend/src/app/app.ts

@@ -1,4 +1,4 @@
-import { Component, signal } from '@angular/core';
+import { Component, signal, inject } from '@angular/core';
 import { OAuthService } from 'angular-oauth2-oidc';
 import { HttpClient, HttpHeaders } from '@angular/common/http';
 
@@ -12,21 +12,22 @@ export class App {
   protected readonly title = signal('LMNP Organizer');
   readonly helloMessage = signal<string>('');
 
-  constructor(private oauthService: OAuthService, private http: HttpClient) {}
+  private readonly oauthService = inject(OAuthService);
+  private readonly http = inject(HttpClient);
 
   get isLoggedIn(): boolean {
     return this.oauthService.hasValidAccessToken();
   }
 
   get username(): string {
-    const claims: any = this.oauthService.getIdentityClaims();
+    const claims = this.oauthService.getIdentityClaims() as Record<string, string> | null;
     if (!claims) return '';
-    return claims.preferred_username || claims.given_name || claims.name || 'User';
+    return claims['preferred_username'] || claims['given_name'] || claims['name'] || 'User';
   }
 
   get email(): string {
-    const claims: any = this.oauthService.getIdentityClaims();
-    return claims?.email || '';
+    const claims = this.oauthService.getIdentityClaims() as Record<string, string> | null;
+    return claims ? claims['email'] : '';
   }
 
   login() {
@@ -34,7 +35,7 @@ export class App {
   }
 
   logout() {
-    this.oauthService.logOut();
+    this.oauthService.revokeTokenAndLogout();
   }
 
   callHelloApi() {