diff --git a/react/src/components/common/PlatformBadge.tsx b/react/src/components/common/PlatformBadge.tsx
index 0606264..be2c9fb 100644
--- a/react/src/components/common/PlatformBadge.tsx
+++ b/react/src/components/common/PlatformBadge.tsx
@@ -16,7 +16,7 @@ export default function PlatformBadge({ platform }: PlatformBadgeProps) {
 
   return (
     <span className="inline-flex items-center justify-center w-8 h-6 rounded text-xs font-medium bg-green-50 text-green-700 border border-green-200">
-      <span className="material-symbols-outlined text-base">android</span>
+      <span className="material-symbols-outlined" style={{ fontSize: "16px", lineHeight: "1" }}>android</span>
     </span>
   );
 }
diff --git a/react/src/components/common/StatusBadge.tsx b/react/src/components/common/StatusBadge.tsx
index d429520..2dadc14 100644
--- a/react/src/components/common/StatusBadge.tsx
+++ b/react/src/components/common/StatusBadge.tsx
@@ -30,7 +30,8 @@ const VARIANT_STYLES: Record<StatusVariant, { badge: string; dot: string }> = {
 
 /** 상태 dot 뱃지 (완료/실패/진행/예약/활성/비활성) */
 export default function StatusBadge({ variant, label }: StatusBadgeProps) {
-  const style = VARIANT_STYLES[variant];
+  // variant가 유효하지 않으면 default로 폴백
+  const style = VARIANT_STYLES[variant] ?? VARIANT_STYLES.default;
 
   return (
     <span
diff --git a/react/src/features/dashboard/components/RecentMessages.tsx b/react/src/features/dashboard/components/RecentMessages.tsx
index 009d85a..86c5663 100644
--- a/react/src/features/dashboard/components/RecentMessages.tsx
+++ b/react/src/features/dashboard/components/RecentMessages.tsx
@@ -79,7 +79,7 @@ export default function RecentMessages({ messages = DEFAULT_MESSAGES, loading }:
                 <td className="px-6 py-3.5 text-center text-gray-600">{msg.targetCount}</td>
                 <td className="px-6 py-3.5 text-center">
                   <StatusBadge
-                    variant={STATUS_MAP[msg.status]}
+                    variant={STATUS_MAP[msg.status] ?? "default"}
                     label={msg.status}
                   />
                 </td>
diff --git a/react/src/features/dashboard/pages/DashboardPage.tsx b/react/src/features/dashboard/pages/DashboardPage.tsx
index 5c7b332..da16bdd 100644
--- a/react/src/features/dashboard/pages/DashboardPage.tsx
+++ b/react/src/features/dashboard/pages/DashboardPage.tsx
@@ -46,13 +46,38 @@ function mapCards(data: DashboardData) {
   ];
 }
 
-/** daily → WeeklyChart props 변환 */
+/** daily → WeeklyChart props 변환 (최근 7일 기준, 없는 날짜는 0으로 채움) */
 function mapChart(data: DashboardData) {
-  const trends = data.daily ?? [];
-  if (trends.length === 0) return [];
+  const allTrends = data.daily ?? [];
 
-  const maxVal = Math.max(...trends.map((t) => Math.max(t.send_count, t.success_count)), 1);
-  const todayStr = new Date().toISOString().slice(0, 10);
+  // 최근 7일 날짜 목록 생성 (오늘 포함)
+  const today = new Date();
+  const todayStr = today.toISOString().slice(0, 10);
+  const last7Days = Array.from({ length: 7 }, (_, i) => {
+    const d = new Date(today);
+    d.setDate(today.getDate() - 6 + i);
+    return d.toISOString().slice(0, 10);
+  });
+
+  const dataMap = new Map(allTrends.map((t) => [t.stat_date, t]));
+
+  // 없는 날짜는 send_count 0으로 채움
+  const trends = last7Days.map(
+    (date) =>
+      dataMap.get(date) ?? {
+        stat_date: date,
+        send_count: 0,
+        success_count: 0,
+        fail_count: 0,
+        open_count: 0,
+        ctr: 0,
+      },
+  );
+
+  const maxVal = Math.max(
+    ...trends.map((t) => Math.max(t.send_count, t.success_count)),
+    1,
+  );
 
   return trends.map((t) => {
     const dateStr = t.stat_date ?? "";
diff --git a/react/src/features/device/components/DeviceSlidePanel.tsx b/react/src/features/device/components/DeviceSlidePanel.tsx
index 7fc5a45..a42e5da 100644
--- a/react/src/features/device/components/DeviceSlidePanel.tsx
+++ b/react/src/features/device/components/DeviceSlidePanel.tsx
@@ -2,6 +2,7 @@ import { useEffect, useRef, useState } from "react";
 import { toast } from "sonner";
 import CopyButton from "@/components/common/CopyButton";
 import { deleteDevice } from "@/api/device.api";
+import { formatDate } from "@/utils/format";
 import type { DeviceListItem } from "../types";
 
 interface DeviceSlidePanelProps {
@@ -68,7 +69,7 @@ export default function DeviceSlidePanel({
   // 플랫폼 아이콘 렌더링
   const renderPlatformIcon = () => {
     if (!device) return null;
-    if (device.platform === "iOS") {
+    if (device.platform?.toLowerCase() === "ios") {
       return (
         <div className="size-10 rounded-lg bg-gray-100 flex items-center justify-center flex-shrink-0">
           <svg className="size-5 text-gray-700" viewBox="0 0 384 512" fill="currentColor">
@@ -261,7 +262,7 @@ export default function DeviceSlidePanel({
                   <div>
                     <p className="text-[11px] text-gray-400 mb-0.5">등록일</p>
                     <p className="text-sm font-medium text-[#0f172a]">
-                      {device.created_at}
+                      {formatDate(device.created_at ?? "")}
                     </p>
                   </div>
                   <div>
@@ -269,7 +270,7 @@ export default function DeviceSlidePanel({
                       마지막 활동
                     </p>
                     <p className="text-sm font-medium text-[#0f172a]">
-                      {device.last_active_at}
+                      {formatDate(device.last_active_at ?? "")}
                     </p>
                   </div>
                   <div>
@@ -281,7 +282,7 @@ export default function DeviceSlidePanel({
                   <div>
                     <p className="text-[11px] text-gray-400 mb-0.5">플랫폼</p>
                     <p className="text-sm font-medium text-[#0f172a]">
-                      {device.platform}
+                      {device.platform?.toLowerCase() === "ios" ? "iOS" : "Android"}
                     </p>
                   </div>
                 </div>
diff --git a/react/src/features/device/components/SecretToggleCell.tsx b/react/src/features/device/components/SecretToggleCell.tsx
index a7ce7d6..2d86d24 100644
--- a/react/src/features/device/components/SecretToggleCell.tsx
+++ b/react/src/features/device/components/SecretToggleCell.tsx
@@ -1,4 +1,4 @@
-import { useRef, useEffect } from "react";
+import { useRef, useEffect, useState } from "react";
 import CopyButton from "@/components/common/CopyButton";
 
 interface SecretToggleCellProps {
@@ -18,7 +18,10 @@ export default function SecretToggleCell({
   onToggle,
 }: SecretToggleCellProps) {
   const containerRef = useRef<HTMLDivElement>(null);
+  const buttonRef = useRef<HTMLButtonElement>(null);
+  const popoverRef = useRef<HTMLDivElement>(null);
   const isOpen = openKey === dropdownKey;
+  const [pos, setPos] = useState<{ top: number; left: number } | null>(null);
 
   // 외부 클릭 시 닫힘
   useEffect(() => {
@@ -26,7 +29,9 @@ export default function SecretToggleCell({
     const handleClick = (e: MouseEvent) => {
       if (
         containerRef.current &&
-        !containerRef.current.contains(e.target as Node)
+        !containerRef.current.contains(e.target as Node) &&
+        popoverRef.current &&
+        !popoverRef.current.contains(e.target as Node)
       ) {
         onToggle(null);
       }
@@ -35,6 +40,26 @@ export default function SecretToggleCell({
     return () => document.removeEventListener("mousedown", handleClick);
   }, [isOpen, onToggle]);
 
+  // 스크롤 시 닫기
+  useEffect(() => {
+    if (!isOpen) return;
+    const close = () => onToggle(null);
+    window.addEventListener("scroll", close, true);
+    return () => window.removeEventListener("scroll", close, true);
+  }, [isOpen, onToggle]);
+
+  const handleToggle = () => {
+    if (isOpen) {
+      onToggle(null);
+    } else {
+      const rect = buttonRef.current?.getBoundingClientRect();
+      if (rect) {
+        setPos({ top: rect.bottom + 4, left: rect.left + rect.width / 2 });
+      }
+      onToggle(dropdownKey);
+    }
+  };
+
   return (
     <div
       ref={containerRef}
@@ -42,8 +67,9 @@ export default function SecretToggleCell({
       onClick={(e) => e.stopPropagation()}
     >
       <button
+        ref={buttonRef}
         className="text-xs text-[#2563EB] hover:text-[#1d4ed8] font-medium transition-colors inline-flex items-center gap-1"
-        onClick={() => onToggle(isOpen ? null : dropdownKey)}
+        onClick={handleToggle}
       >
         {label}
         <span
@@ -54,8 +80,13 @@ export default function SecretToggleCell({
         </span>
       </button>
 
-      {isOpen && (
-        <div className="absolute left-1/2 -translate-x-1/2 top-full mt-1 w-[340px] bg-gray-50 border border-gray-200 rounded-lg p-3 shadow-lg z-10">
+      {/* fixed로 렌더링해서 테이블 overflow 밖으로 벗어남 */}
+      {isOpen && pos && (
+        <div
+          ref={popoverRef}
+          className="fixed w-[340px] bg-gray-50 border border-gray-200 rounded-lg p-3 shadow-lg z-[9999]"
+          style={{ top: pos.top, left: pos.left, transform: "translateX(-50%)" }}
+        >
           <div className="flex items-center gap-2">
             <code className="text-[11px] text-gray-600 font-mono break-all leading-relaxed flex-1">
               {value}
diff --git a/react/src/features/device/pages/DeviceListPage.tsx b/react/src/features/device/pages/DeviceListPage.tsx
index a887488..03bcbe9 100644
--- a/react/src/features/device/pages/DeviceListPage.tsx
+++ b/react/src/features/device/pages/DeviceListPage.tsx
@@ -396,7 +396,7 @@ export default function DeviceListPage() {
                     <td className="px-6 py-4 text-center">
                       <PlatformBadge
                         platform={
-                          device.platform === "iOS" ? "ios" : "android"
+                          device.platform?.toLowerCase() === "ios" ? "ios" : "android"
                         }
                       />
                     </td>
diff --git a/react/src/utils/format.ts b/react/src/utils/format.ts
index 09bf683..f523f10 100644
--- a/react/src/utils/format.ts
+++ b/react/src/utils/format.ts
@@ -1,9 +1,12 @@
 import { format, formatDistanceToNow } from "date-fns";
 import { ko } from "date-fns/locale";
 
-/** 날짜 포맷 (YYYY-MM-DD) */
+/** 날짜 포맷 (YYYY-MM-DD). 서버 기본값(0001-01-01)이면 "-" 반환 */
 export function formatDate(date: string | Date): string {
-  return format(new Date(date), "yyyy-MM-dd");
+  if (!date) return "-";
+  const d = new Date(date);
+  if (d.getFullYear() <= 1) return "-";
+  return format(d, "yyyy-MM-dd");
 }
 
 /** 날짜+시간 포맷 (YYYY-MM-DD HH:mm) */