Implement comprehensive dark/light mode overhaul for admin panel

- Refactor color palette in `ui-design-spec.md` to utilize CSS variables exclusively, eliminating fixed hex values and Tailwind utility classes.
- Complete dark mode implementation in `uiStore.ts`, ensuring proper theme application via `applyTheme()` and `applyBrand()`.
- Create `admin-theme-dark-light-audit.md` to document the transition process, outlining issues with inline styles and fixed colors.
- Introduce `theme-tokens.test.ts` to enforce rules against fixed hex colors and ensure compliance with the design system.
- Update various components and styles to replace inline styles and fixed colors with CSS variables, ensuring consistent theming across light and dark modes.
- Ensure all changes maintain visual integrity in both light and dark modes, with a focus on accessibility and contrast standards.

assets/admin/components/appointments/TurnsStatInfo.tsx

@@ -32,10 +32,10 @@ function BadgeIcon({ Icon, color, bg }: { Icon: React.ElementType; color: string
 
 export default function TurnsStatInfo({ stats }: { stats: TurnsStats }) {
   const items: StatDef[] = [
-    { title: 'کل نوبت های امروز', value: stats.total,     Icon: UsersIcon,     iconColor: '#494cb3', iconBg: '#e9ebfb' },
-    { title: 'نوبت های انجام شده', value: stats.completed, Icon: UserPlusIcon,  iconColor: '#0d9f43', iconBg: '#e7f6ed' },
-    { title: 'بیماران در انتظار',  value: stats.waiting,   Icon: ClockIcon,     iconColor: '#e0a838', iconBg: '#fff2dc' },
-    { title: 'نوبت های لغو شده',   value: stats.cancelled, Icon: XCircleIcon,   iconColor: '#ee5c6d', iconBg: '#fad6da' },
+    { title: 'کل نوبت های امروز', value: stats.total,     Icon: UsersIcon,     iconColor: 'var(--primary-600)', iconBg: 'var(--primary-soft)' },
+    { title: 'نوبت های انجام شده', value: stats.completed, Icon: UserPlusIcon,  iconColor: 'var(--success)', iconBg: 'var(--success-bg)' },
+    { title: 'بیماران در انتظار',  value: stats.waiting,   Icon: ClockIcon,     iconColor: 'var(--warning)', iconBg: 'var(--warning-bg)' },
+    { title: 'نوبت های لغو شده',   value: stats.cancelled, Icon: XCircleIcon,   iconColor: 'var(--danger)', iconBg: 'var(--danger-bg)' },
   ];
 
   return (