foregroundColor & backgroundColor update with theme change

[imtase]

Using Angular 18 signal for dark/light theme management with computed in my component.

speedoForeground = computed(() => this._theme.currentTheme() === 'dark' ? 'rgb(192,241,144)' : 'rgb(164,213,119)');
speedoBackground = computed(() => this._theme.currentTheme() === 'dark' ? 'rgb(34,67,0)' : 'rgb(239,241,234)';

Despite setting changeDetection: ChangeDetectionStrategy.OnPush, the gauge colors don’t update automatically; the update only occurs when the gauge value changes.