사용자 정보 팝오버 추가

frontend/public/styles.css

@@ -230,6 +230,7 @@
   display: flex;
   align-items: center;
   gap: 6px;
+  position: relative;
 }
 
 .ghost-button {
@@ -252,6 +253,7 @@
   align-items: center;
   gap: 8px;
   padding: 0 10px;
+  cursor: pointer;
 }
 
 .user-chip-icon {
@@ -305,6 +307,39 @@
   stroke-linejoin: round;
 }
 
+.user-popover {
+  position: absolute;
+  top: calc(100% + 10px);
+  right: 42px;
+  min-width: 220px;
+  padding: 14px;
+  border: 1px solid #dbe2ea;
+  border-radius: 16px;
+  background: rgba(255, 255, 255, 0.96);
+  box-shadow: 0 18px 36px rgba(15, 23, 42, 0.14);
+  backdrop-filter: blur(12px);
+  z-index: 30;
+}
+
+.user-popover-row {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 16px;
+  font-size: 12px;
+  padding: 6px 0;
+  color: var(--color-text);
+}
+
+.user-popover-row + .user-popover-row {
+  border-top: 1px solid #eef2f7;
+}
+
+.user-popover-label {
+  color: var(--color-text-muted);
+  font-weight: 700;
+}
+
 .dashboard-main {
   flex: 1;
   min-height: calc(100vh - 68px);