feat: enhance V2ButtonConfigPanel to support dynamic column mapping

- Implemented logic to load reference table columns based on selected target table, improving the configurability of button mappings.
- Added error handling for API calls to ensure robustness when fetching column data.
- Updated dependencies in the useEffect hook to ensure proper reactivity when available tables change.

These enhancements aim to provide users with a more flexible and dynamic configuration experience in the V2ButtonConfigPanel, allowing for better management of button mappings based on table relationships.

frontend/components/v2/config-panels/V2ButtonConfigPanel.tsx

@@ -387,13 +387,51 @@ export const V2ButtonConfigPanel: React.FC<V2ButtonConfigPanelProps> = ({
 
       if (targetTable) {
         const cols = await loadTableColumns(targetTable);
+
+        try {
+          const fullResponse = await apiClient.get(`/table-management/tables/${targetTable}/columns`);
+          let fullColumnData = fullResponse.data?.data;
+          if (!Array.isArray(fullColumnData) && fullColumnData?.columns) fullColumnData = fullColumnData.columns;
+          if (!Array.isArray(fullColumnData) && fullColumnData?.data) fullColumnData = fullColumnData.data;
+
+          if (Array.isArray(fullColumnData)) {
+            const refTableSet = new Set<string>();
+            fullColumnData.forEach((col: any) => {
+              const inputType = col.inputType || col.input_type;
+              if (inputType !== "entity") return;
+              let refTable = col.referenceTable || col.reference_table;
+              if (!refTable && col.detailSettings) {
+                try {
+                  const ds = typeof col.detailSettings === "string" ? JSON.parse(col.detailSettings) : col.detailSettings;
+                  refTable = ds?.referenceTable;
+                } catch { /* ignore */ }
+              }
+              if (refTable) refTableSet.add(refTable);
+            });
+
+            const targetColumnNames = new Set(cols.map((c) => c.name));
+            for (const refTable of refTableSet) {
+              const refCols = await loadTableColumns(refTable);
+              const refTableLabel = availableTables.find((t) => t.name === refTable)?.label || refTable;
+              refCols.forEach((rc) => {
+                if (!targetColumnNames.has(rc.name)) {
+                  cols.push({
+                    name: rc.name,
+                    label: `${rc.label} [${refTableLabel}]`,
+                  });
+                }
+              });
+            }
+          }
+        } catch { /* ignore */ }
+
         setMappingTargetColumns(cols);
       } else {
         setMappingTargetColumns([]);
       }
     };
     loadAll();
-  }, [actionType, config.action?.dataTransfer?.multiTableMappings, config.action?.dataTransfer?.targetTable, loadTableColumns]);
+  }, [actionType, config.action?.dataTransfer?.multiTableMappings, config.action?.dataTransfer?.targetTable, availableTables, loadTableColumns]);
 
   // 화면 목록 로드 (모달 액션용)
   useEffect(() => {