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

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

src/app/models/game.models.ts

@@ -1,5 +1,10 @@
 export type GameTurn = 'white' | 'black';
 
+export interface ClockState {
+  whiteRemainingMs: number;
+  blackRemainingMs: number;
+}
+
 export type GameStatus =
   | 'started'
   | 'check'
@@ -26,6 +31,7 @@ export interface GameState {
   moves: string[];
   undoAvailable: boolean;
   redoAvailable: boolean;
+  clock: ClockState | null;
 }
 
 export interface GameFull {