feat: create PageTabs navigation component

.gitignore

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+# .NET
+bin/
+obj/
+*.user
+*.suo
+.vs/
+publish/
+
+# Node / Angular
+node_modules/
+apps/angular/node_modules/
+apps/react/node_modules/
+dist/
+.angular/
+ClientApp/dist/
+ClientApp/coverage/
+ClientApp/.storybook-out/
+
+# Logs
+*.log
+npm-debug.log*
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env / secrets
+*.env
+appsettings.Development.json
+
+# wwwroot build output (keep static assets, ignore generated JS)
+wwwroot/dist/

apps/react/src/app/components/page-tabs/index.ts

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+export { PageTabs } from './page-tabs'

apps/react/src/app/components/page-tabs/page-tabs.scss

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+.page-tabs {
+  display: flex;
+  gap: 10px;
+  border-bottom: 2px solid #e0e0e0;
+  margin-bottom: 20px;
+}
+
+.page-tabs__link {
+  padding: 12px 16px;
+  text-decoration: none;
+  color: #666;
+  font-weight: 500;
+  border-bottom: 3px solid transparent;
+  cursor: pointer;
+  transition: all 0.2s ease;
+
+  &:hover {
+    color: #333;
+  }
+
+  &--active {
+    color: #1976d2;
+    border-bottom-color: #1976d2;
+  }
+}

apps/react/src/app/components/page-tabs/page-tabs.tsx

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+import React from 'react'
+import { Link, useLocation } from 'react-router-dom'
+import { useTranslation } from 'react-i18next'
+import './page-tabs.scss'
+
+export const PageTabs: React.FC = () => {
+  const location = useLocation()
+  const { t } = useTranslation()
+
+  const tabs = [
+    { path: '/onlineboard', label: 'SHARED.ONLINE_BOARD', testId: 'onlineboard-tab' },
+    { path: '/schedule', label: 'SHARED.SCHEDULE', testId: 'schedule-tab' },
+    { path: '/flights-map', label: 'SHARED.FLIGHTS_MAP', testId: 'flights-map-tab' },
+  ]
+
+  const isActive = (path: string) => location.pathname.startsWith(path)
+
+  return (
+    <nav className="page-tabs" data-testid="page-tabs">
+      {tabs.map((tab) => (
+        <Link
+          key={tab.path}
+          to={tab.path}
+          className={`page-tabs__link ${isActive(tab.path) ? 'page-tabs__link--active' : ''}`}
+          data-testid={tab.testId}
+        >
+          {t(tab.label)}
+        </Link>
+      ))}
+    </nav>
+  )
+}