Merge branch 'feature/session-timeout'

# Conflicts:
#	src/main/resources/static/css/main.css.map

src/main/resources/static/css/main.css

@@ -5310,6 +5310,37 @@ select.form-control {
     right: -20px;
   }
 }
+.session-timer {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  white-space: nowrap;
+  font-size: 14px;
+  font-weight: 600;
+  color: #64748B;
+}
+.session-timer .session-timer-icon {
+  font-size: 12px;
+  color: #64748B;
+}
+.session-timer .session-timer-text {
+  font-variant-numeric: tabular-nums;
+  min-width: 40px;
+  text-align: center;
+}
+.session-timer .session-timer-text.session-timer-warning {
+  color: #e03131;
+  font-weight: 700;
+}
+
+.session-timer-mobile {
+  margin-right: 8px;
+  font-size: 12px;
+}
+.session-timer-mobile .session-timer-text {
+  min-width: 34px;
+}
+
 .data-table {
   width: 100%;
   background: #FFFFFF;

src/main/resources/static/sass/components/_session-timer.scss

@@ -0,0 +1,43 @@
+@use '../abstracts/variables' as *;
+
+// -----------------------------------------------------------------------------
+// Session Timer Component
+// 인증 사용자 헤더에 남은 세션 시간을 표시. 만료 임박(<=60s) 시 경고색.
+// -----------------------------------------------------------------------------
+
+.session-timer {
+  display: inline-flex;
+  align-items: center;
+  gap: $spacing-xs;
+  white-space: nowrap;
+  font-size: $font-size-sm;
+  font-weight: $font-weight-semibold;
+  color: $text-gray;
+
+  .session-timer-icon {
+    font-size: $font-size-xs;
+    color: $text-gray;
+  }
+
+  .session-timer-text {
+    // 카운트다운 중 폭 흔들림 방지
+    font-variant-numeric: tabular-nums;
+    min-width: 40px;
+    text-align: center;
+
+    &.session-timer-warning {
+      color: #e03131;
+      font-weight: $font-weight-bold;
+    }
+  }
+}
+
+// 모바일 헤더(햄버거 버튼 좌측)용 타이머
+.session-timer-mobile {
+  margin-right: $spacing-sm;
+  font-size: $font-size-xs;
+
+  .session-timer-text {
+    min-width: 34px;
+  }
+}

src/main/resources/static/sass/main.scss

@@ -35,6 +35,7 @@
 @use 'components/cta' as *;
 @use 'components/password-popup' as *;
 @use 'components/header-auth' as *;
+@use 'components/session-timer' as *;
 @use 'components/tables' as *;
 @use 'components/accordion' as *;
 @use 'components/page-title-banner' as *;