fix(attendance): 월간 근태 설명 텍스트 제거 + 상단 바 개선

- 불필요한 설명 텍스트 제거
- 제목+날짜+조회를 한 줄로 통합
- 조회 버튼에 돋보기 아이콘 + 둥근 모서리

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

system1-factory/web/pages/attendance/monthly.html

@@ -398,16 +398,13 @@
             <nav id="sideNav" class="hidden lg:flex flex-col gap-1 w-52 flex-shrink-0 pt-2 fixed lg:static z-40 bg-white lg:bg-transparent p-4 lg:p-0 rounded-lg lg:rounded-none shadow-lg lg:shadow-none top-14 left-0 bottom-0 overflow-y-auto"></nav>
             <div class="flex-1 min-w-0">
 
-      <div class="page-header">
-        <div class="page-title-section">
-          <h1 class="page-title">월별 출근부</h1>
-          <p class="page-description">전체 작업자의 월별 출근 현황을 확인합니다</p>
-        </div>
-      </div>
-      <div style="display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:8px; margin-bottom:16px;">
-        <div style="display:flex; align-items:center; gap:8px;">
-          <input type="month" id="selectedMonth" class="form-control" style="width:auto;">
-          <button class="btn btn-primary" onclick="loadMonthlyData()">조회</button>
+      <div style="display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:10px; margin-bottom:16px;">
+        <div style="display:flex; align-items:center; gap:10px;">
+          <h1 style="font-size:18px; font-weight:700; margin:0; white-space:nowrap;">월별 출근부</h1>
+          <input type="month" id="selectedMonth" class="form-control" style="width:auto; border-radius:8px; border:1px solid #d1d5db; padding:6px 10px; font-size:14px;">
+          <button class="btn btn-primary" onclick="loadMonthlyData()" style="border-radius:8px; padding:6px 16px; font-size:14px;">
+            <i class="fas fa-search" style="margin-right:4px;"></i>조회
+          </button>
         </div>
         <div style="display:flex; align-items:center; gap:8px;">
           <button class="btn btn-secondary btn-sm" onclick="openHolidayModal()" title="휴무일 설정">