i18n complete: all 16 components translated (CZ/HE/RU/UA)

- Custom i18n provider with React Context + localStorage
- Hebrew RTL support (dir=rtl on html)
- All pages + components use t() calls
- FullCalendar + dates locale-aware
- Language selector in Settings wired to context

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/tasks/app/calendar/page.tsx

@@ -4,6 +4,7 @@ import FullCalendar from '@fullcalendar/react';
 import dayGridPlugin from '@fullcalendar/daygrid';
 import timeGridPlugin from '@fullcalendar/timegrid';
 import interactionPlugin from '@fullcalendar/interaction';
+import { useTranslation } from '@/lib/i18n';
 
 const API_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000';
 
@@ -17,8 +18,16 @@ interface Task {
   group_color: string;
 }
 
+const LOCALE_MAP: Record<string, string> = {
+  cs: 'cs',
+  he: 'he',
+  ru: 'ru',
+  ua: 'uk',
+};
+
 export default function CalendarPage() {
   const [tasks, setTasks] = useState<Task[]>([]);
+  const { t, locale } = useTranslation();
 
   useEffect(() => {
     fetch(`${API_URL}/api/v1/tasks?limit=100`)
@@ -42,7 +51,7 @@ export default function CalendarPage() {
 
   return (
     <div className="p-4">
-      <h1 className="text-2xl font-bold mb-4">Kalendar</h1>
+      <h1 className="text-2xl font-bold mb-4">{t('calendar.title')}</h1>
       <div className="bg-white dark:bg-gray-800 rounded-xl p-4 shadow">
         <FullCalendar
           plugins={[dayGridPlugin, timeGridPlugin, interactionPlugin]}
@@ -55,7 +64,8 @@ export default function CalendarPage() {
           events={events}
           editable={true}
           selectable={true}
-          locale="cs"
+          locale={LOCALE_MAP[locale] || 'cs'}
+          direction={locale === 'he' ? 'rtl' : 'ltr'}
           firstDay={1}
           height="auto"
           slotMinTime="06:00:00"