fix: update PageLayout structure to use two-row header/content layout

- Restructure PageLayout to render header row (tabs + title) and content row separately
- Update OnlineBoardStartPage and ScheduleStartPage to pass tabs as headerLeft
- Update search and details pages to use new headerLeft/title props
- Delete conflicting compiled JS files (page-layout.js, old index.tsx)

apps/react/src/app/components/page-layout/index.tsx

@@ -1,27 +0,0 @@
-import React from 'react'
-
-interface PageLayoutProps {
-  children: React.ReactNode
-  contentLeft?: React.ReactNode
-  stickyContent?: React.ReactNode
-  className?: string
-  [key: string]: any
-}
-
-export const PageLayout: React.FC<PageLayoutProps> = ({
-  children,
-  contentLeft,
-  stickyContent,
-  className = '',
-  ...props
-}) => {
-  return (
-    <div className={`page-layout ${className}`} {...props}>
-      {contentLeft && <aside className="page-layout__sidebar">{contentLeft}</aside>}
-      <main className="page-layout__main">
-        {stickyContent && <div className="page-layout__sticky">{stickyContent}</div>}
-        <div className="page-layout__content">{children}</div>
-      </main>
-    </div>
-  )
-}