Merge branch 'feat/search-implement' into feat/80324-adjust-design-for-left-pane
* feat/search-implement:
77804 change var name
77804 add default
77804 import footstamp from packages/ui
77804 change code position to prioritise styles of _search.scss over _page_list.scss
77804 change icon color
77804 add @growi/app to import footstamp component
77804 add null check
77804 add condition to show footprint
77804 change footstamp's color and margin
77804 add tentative foot print