style(ui): 日期选择器弹层改用中性描边

覆盖 Popover 默认的琥珀色 border-2 与辉光，与下拉菜单的
border-border + shadow-md 观感对齐；时间区间与过期日期两处同步。

Author: g1331

src/components/admin/key/sections/expiry-section.tsx

@@ -90,7 +90,11 @@ export function ExpirySection({ apiKey }: { apiKey: APIKeyResponse }) {
                       </Button>
                     </FormControl>
                   </PopoverTrigger>
-                  <PopoverContent className="w-auto p-0" align="start">
+                  {/* 日期选择器弹层用中性描边（覆盖 Popover 默认的琥珀边框），与下拉菜单一致 */}
+                  <PopoverContent
+                    className="w-auto border border-border p-0 text-foreground shadow-[var(--vr-shadow-md)]"
+                    align="start"
+                  >
                     <Calendar
                       locale={dateLocale}
                       mode="single"

src/components/dashboard/time-range-selector.tsx

@@ -182,7 +182,11 @@ export function TimeRangeSelector({
               {customLabel}
             </button>
           </PopoverTrigger>
-          <PopoverContent className="w-auto p-0" align="end">
+          {/* 日期选择器弹层用中性描边（覆盖 Popover 默认的琥珀边框），与下拉菜单一致 */}
+          <PopoverContent
+            className="w-auto border border-border p-0 text-foreground shadow-[var(--vr-shadow-md)]"
+            align="end"
+          >
             <div className="flex">
               <div className="flex flex-col gap-1 border-r border-divider p-3">
                 <p className="type-label-medium mb-1 px-2 text-muted-foreground">