Fix header bar to hide elements in hamburger menu (expand to sidebar config area) to prevent overflow

[borh]

With 9e71944 the header-bar overflow issue is fixed. But there are still several issues needing addressing:

• hamburger menu should always be rightmost element in bar
• it should be hidden on wide screens
• on smartphone sized, only menu + search bar should be visible
  • other CSS media query breakpoints are possible, but lets first try for the two above
• clicking on the menu triggers: Uncaught ReferenceError: toggleDarkMode is not defined

[ykchen233]

予備アレンジ：
スマート検索：行ごと右側-VERB NOUNの品詞種類表示

[ykchen233]

Need to Fix: show suggestion list on small screen