헤더 타이머 추가

app/views/partials/_header.html.erb

@@ -1,8 +1,9 @@
-<header class="flex header">
-  <div class="flex flex-row">
+<header class="flex header" data-controller="timer">
+  <div class="flex flex-row h-full">
     <%= image_tag "svg/svg_logo.svg", class: "w-16 h-auto" %>
     <div class="flex h-full items-center tracking-[0.5rem]">FARMITRY</div>
   </div>
+  <div data-timer-target="output" class="text-gray-600"></div>
   <div class="flex flex-row items-center gap-x-4">
     <i class="fa-solid fa-circle-user text-4xl text-default-slate-dark"></i>
     <%= link_to "로그아웃", '', class: "btn" %>