feat: NCS-69 Challenge request (#3)

- create challange window
- challanges view page
- decline and accept
- notif tab (wip)
- active game window (wip)

---------

Co-authored-by: shahdlala66 <shahd.lala66@gmail.com>
Co-authored-by: Lala, Shahd <Shahd.Lala@sybit.de>
Reviewed-on: #3

src/app/pages/welcome/welcome.component.ts

@@ -10,6 +10,7 @@ import { AuthDialogService } from '../../services/auth-dialog.service';
 import { AuthService } from '../../services/auth.service';
 import { GameApiService } from '../../services/game-api.service';
 import { ThemeService } from '../../services/theme.service';
+import { ChallengeCreateDialogComponent } from '../../components/challenge-create-dialog/challenge-create-dialog.component';
 
 type Difficulty = 'easy' | 'medium' | 'hard';
 type ImportMode = 'fen' | 'pgn';
@@ -29,10 +30,25 @@ interface WindowCell {
   style: Record<string, string>;
 }
 
+interface Star {
+  style: Record<string, string>;
+}
+
+interface BackgroundBuilding {
+  style: Record<string, string>;
+}
+
+interface WindowCell {
+  state: 'off' | 'on';
+  color?: string;
+  glowColor?: string;
+  style: Record<string, string>;
+}
+
 @Component({
   selector: 'app-welcome',
   standalone: true,
-  imports: [CommonModule, FormsModule],
+  imports: [CommonModule, FormsModule, ChallengeCreateDialogComponent],
   templateUrl: './welcome.component.html',
   styleUrls: ['./welcome.component.css']
 })