fix: 셀렉트 드롭다운이 다른 컴포넌트에 가려지는 문제 해결

- React Portal 적용하여 드롭다운을 document.body에 렌더링
- Stacking Context 탈출로 z-index 충돌 문제 해결
- 모든 셀렉트 타입(code, autocomplete, dropdown, multiselect)에 적용

frontend/lib/registry/components/select-basic/SelectBasicComponent.tsx

@@ -1,4 +1,5 @@
 import React, { useState, useEffect, useRef, useMemo } from "react";
+import { createPortal } from "react-dom";
 import { filterDOMProps } from "@/lib/utils/domPropsFilter";
 import { useCodeOptions, useTableCodeCategory } from "@/hooks/queries/useCodes";
 import { cn } from "@/lib/registry/components/common/inputStyles";
@@ -60,6 +61,8 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
   });
 
   const [isOpen, setIsOpen] = useState(false);
+  // 드롭다운 위치 (Portal 렌더링용)
+  const [dropdownPosition, setDropdownPosition] = useState({ top: 0, left: 0, width: 0 });
 
   // webTypeConfig 또는 componentConfig 사용 (DynamicWebTypeRenderer 호환성)
   const config = (props as any).webTypeConfig || componentConfig || {};
@@ -280,9 +283,26 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
   }, [selectedValue, codeOptions, config.options]);
 
   // 클릭 이벤트 핸들러 (React Query로 간소화)
+  // 드롭다운 위치 계산 함수
+  const updateDropdownPosition = () => {
+    if (selectRef.current) {
+      const rect = selectRef.current.getBoundingClientRect();
+      setDropdownPosition({
+        top: rect.bottom + window.scrollY,
+        left: rect.left + window.scrollX,
+        width: rect.width,
+      });
+    }
+  };
+
   const handleToggle = () => {
     if (isDesignMode) return;
 
+    // 드롭다운 열기 전에 위치 계산
+    if (!isOpen) {
+      updateDropdownPosition();
+    }
+
     // React Query가 자동으로 캐시 관리하므로 수동 새로고침 불필요
     setIsOpen(!isOpen);
   };
@@ -404,9 +424,13 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
             value={searchQuery || selectedLabel}
             onChange={(e) => {
               setSearchQuery(e.target.value);
+              updateDropdownPosition();
+              setIsOpen(true);
+            }}
+            onFocus={() => {
+              updateDropdownPosition();
               setIsOpen(true);
             }}
-            onFocus={() => setIsOpen(true)}
             placeholder="코드 또는 코드명 입력..."
             className={cn(
               "h-10 w-full rounded-lg border border-gray-300 bg-white px-3 py-2 transition-all outline-none",
@@ -415,8 +439,16 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
             )}
             readOnly={isDesignMode}
           />
-          {isOpen && !isDesignMode && filteredOptions.length > 0 && (
-            <div className="absolute z-[99999] mt-1 max-h-60 w-full overflow-auto rounded-md border border-gray-300 bg-white shadow-lg">
+          {/* Portal을 사용하여 드롭다운을 document.body에 렌더링 */}
+          {isOpen && !isDesignMode && filteredOptions.length > 0 && typeof document !== "undefined" && createPortal(
+            <div 
+              className="fixed z-[99999] max-h-60 overflow-auto rounded-md border border-gray-300 bg-white shadow-lg"
+              style={{
+                top: dropdownPosition.top,
+                left: dropdownPosition.left,
+                width: dropdownPosition.width,
+              }}
+            >
               {filteredOptions.map((option, index) => (
                 <div
                   key={`${option.value}-${index}`}
@@ -432,7 +464,8 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
                   </div>
                 </div>
               ))}
-            </div>
+            </div>,
+            document.body
           )}
         </div>
       );
@@ -462,8 +495,16 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
             </svg>
           </div>
-          {isOpen && !isDesignMode && (
-            <div className="absolute z-[99999] mt-1 max-h-60 w-full overflow-auto rounded-md border border-gray-300 bg-white shadow-lg">
+          {/* Portal을 사용하여 드롭다운을 document.body에 렌더링 */}
+          {isOpen && !isDesignMode && typeof document !== "undefined" && createPortal(
+            <div 
+              className="fixed z-[99999] max-h-60 overflow-auto rounded-md border border-gray-300 bg-white shadow-lg"
+              style={{
+                top: dropdownPosition.top,
+                left: dropdownPosition.left,
+                width: dropdownPosition.width,
+              }}
+            >
               {isLoadingCodes ? (
                 <div className="bg-white px-3 py-2 text-gray-900">로딩 중...</div>
               ) : allOptions.length > 0 ? (
@@ -479,7 +520,8 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
               ) : (
                 <div className="bg-white px-3 py-2 text-gray-900">옵션이 없습니다</div>
               )}
-            </div>
+            </div>,
+            document.body
           )}
         </div>
       );
@@ -544,9 +586,13 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
             value={searchQuery}
             onChange={(e) => {
               setSearchQuery(e.target.value);
+              updateDropdownPosition();
+              setIsOpen(true);
+            }}
+            onFocus={() => {
+              updateDropdownPosition();
               setIsOpen(true);
             }}
-            onFocus={() => setIsOpen(true)}
             placeholder={placeholder}
             className={cn(
               "h-10 w-full rounded-lg border border-gray-300 bg-white px-3 py-2 transition-all outline-none",
@@ -555,8 +601,16 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
             )}
             readOnly={isDesignMode}
           />
-          {isOpen && !isDesignMode && filteredOptions.length > 0 && (
-            <div className="absolute z-[99999] mt-1 max-h-60 w-full overflow-auto rounded-md border border-gray-300 bg-white shadow-lg">
+          {/* Portal을 사용하여 드롭다운을 document.body에 렌더링 */}
+          {isOpen && !isDesignMode && filteredOptions.length > 0 && typeof document !== "undefined" && createPortal(
+            <div 
+              className="fixed z-[99999] max-h-60 overflow-auto rounded-md border border-gray-300 bg-white shadow-lg"
+              style={{
+                top: dropdownPosition.top,
+                left: dropdownPosition.left,
+                width: dropdownPosition.width,
+              }}
+            >
               {filteredOptions.map((option, index) => (
                 <div
                   key={`${option.value}-${index}`}
@@ -574,7 +628,8 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
                   {option.label}
                 </div>
               ))}
-            </div>
+            </div>,
+            document.body
           )}
         </div>
       );
@@ -604,8 +659,16 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
             </svg>
           </div>
-          {isOpen && !isDesignMode && (
-            <div className="absolute z-[99999] mt-1 w-full rounded-md border border-gray-300 bg-white shadow-lg">
+          {/* Portal을 사용하여 드롭다운을 document.body에 렌더링 */}
+          {isOpen && !isDesignMode && typeof document !== "undefined" && createPortal(
+            <div 
+              className="fixed z-[99999] rounded-md border border-gray-300 bg-white shadow-lg"
+              style={{
+                top: dropdownPosition.top,
+                left: dropdownPosition.left,
+                width: dropdownPosition.width,
+              }}
+            >
               <input
                 type="text"
                 value={searchQuery}
@@ -630,7 +693,8 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
                     </div>
                   ))}
               </div>
-            </div>
+            </div>,
+            document.body
           )}
         </div>
       );
@@ -647,7 +711,12 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
               !isDesignMode && "hover:border-orange-400",
               isSelected && "ring-2 ring-orange-500",
             )}
-            onClick={() => !isDesignMode && setIsOpen(true)}
+            onClick={() => {
+              if (!isDesignMode) {
+                updateDropdownPosition();
+                setIsOpen(true);
+              }
+            }}
             style={{ 
               pointerEvents: isDesignMode ? "none" : "auto",
               height: "100%"
@@ -680,22 +749,30 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
               <span className="text-gray-500">{placeholder}</span>
             )}
           </div>
-          {isOpen && !isDesignMode && (
-            <div className="absolute z-[99999] mt-1 max-h-60 w-full overflow-auto rounded-md border border-gray-300 bg-white shadow-lg">
+          {/* Portal을 사용하여 드롭다운을 document.body에 렌더링 */}
+          {isOpen && !isDesignMode && typeof document !== "undefined" && createPortal(
+            <div 
+              className="fixed z-[99999] max-h-60 overflow-auto rounded-md border border-gray-300 bg-white shadow-lg"
+              style={{
+                top: dropdownPosition.top,
+                left: dropdownPosition.left,
+                width: dropdownPosition.width,
+              }}
+            >
               {(isLoadingCodes || isLoadingCategories) ? (
                 <div className="bg-white px-3 py-2 text-gray-900">로딩 중...</div>
               ) : allOptions.length > 0 ? (
                 allOptions.map((option, index) => {
-                  const isSelected = selectedValues.includes(option.value);
+                  const isOptionSelected = selectedValues.includes(option.value);
                   return (
                     <div
                       key={`${option.value}-${index}`}
                       className={cn(
                         "cursor-pointer px-3 py-2 text-gray-900 hover:bg-gray-100",
-                        isSelected && "bg-blue-50 font-medium"
+                        isOptionSelected && "bg-blue-50 font-medium"
                       )}
                       onClick={() => {
-                        const newVals = isSelected
+                        const newVals = isOptionSelected
                           ? selectedValues.filter((v) => v !== option.value)
                           : [...selectedValues, option.value];
                         setSelectedValues(newVals);
@@ -708,7 +785,7 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
                       <div className="flex items-center gap-2">
                         <input
                           type="checkbox"
-                          checked={isSelected}
+                          checked={isOptionSelected}
                           onChange={() => {}}
                           className="h-4 w-4"
                         />
@@ -720,7 +797,8 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
               ) : (
                 <div className="bg-white px-3 py-2 text-gray-900">옵션이 없습니다</div>
               )}
-            </div>
+            </div>,
+            document.body
           )}
         </div>
       );
@@ -749,8 +827,16 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
             <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
           </svg>
         </div>
-        {isOpen && !isDesignMode && (
-          <div className="absolute z-[99999] mt-1 max-h-60 w-full overflow-auto rounded-md border border-gray-300 bg-white shadow-lg">
+        {/* Portal을 사용하여 드롭다운을 document.body에 렌더링 */}
+        {isOpen && !isDesignMode && typeof document !== "undefined" && createPortal(
+          <div 
+            className="fixed z-[99999] max-h-60 overflow-auto rounded-md border border-gray-300 bg-white shadow-lg"
+            style={{
+              top: dropdownPosition.top,
+              left: dropdownPosition.left,
+              width: dropdownPosition.width,
+            }}
+          >
             {isLoadingCodes ? (
               <div className="bg-white px-3 py-2 text-gray-900">로딩 중...</div>
             ) : allOptions.length > 0 ? (
@@ -766,7 +852,8 @@ const SelectBasicComponent: React.FC<SelectBasicComponentProps> = ({
             ) : (
               <div className="bg-white px-3 py-2 text-gray-900">옵션이 없습니다</div>
             )}
-          </div>
+          </div>,
+          document.body
         )}
       </div>
     );