fix: NCWF-2 bugs and desing fixes (#7)

Co-authored-by: Lala, Shahd <Shahd.Lala@sybit.de>
Reviewed-on: #7

src/app/services/game-history.service.ts

@@ -0,0 +1,39 @@
+import { Injectable } from '@angular/core';
+
+const STORAGE_KEY = 'nowchess.games';
+const MAX_ENTRIES = 50;
+
+interface GameEntry {
+  id: string;
+  addedAt: number;
+}
+
+@Injectable({ providedIn: 'root' })
+export class GameHistoryService {
+  recordGame(gameId: string): void {
+    const entries = this.load().filter((e) => e.id !== gameId);
+    entries.unshift({ id: gameId, addedAt: Date.now() });
+    this.save(entries.slice(0, MAX_ENTRIES));
+  }
+
+  getGameIds(): string[] {
+    return this.load().map((e) => e.id);
+  }
+
+  removeGame(gameId: string): void {
+    this.save(this.load().filter((e) => e.id !== gameId));
+  }
+
+  private load(): GameEntry[] {
+    try {
+      const raw = localStorage.getItem(STORAGE_KEY);
+      return raw ? (JSON.parse(raw) as GameEntry[]) : [];
+    } catch {
+      return [];
+    }
+  }
+
+  private save(entries: GameEntry[]): void {
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(entries));
+  }
+}