✨ feat(query-editor): 结果页列元数据跨库加载并实心化保存按钮

- 结果集携带 metadataDbName/TableName，列类型注释从真实库表加载
- 只读查询也解析 tableRef，避免结果页丢元数据
- 选择列底色与固定列对齐；保存按钮改为蓝色实心主按钮样式
- 独立结果窗/还原路径同步元数据字段

frontend/src/components/QueryEditor.tsx

@@ -6549,6 +6549,9 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
                         columns: cols,
                         messages: resultMessages,
                         tableName: tableRef?.tableName,
+                        // 跨库/跨 schema 查询时，列类型与注释必须从真实表所在库加载
+                        metadataDbName: tableRef?.metadataDbName,
+                        metadataTableName: tableRef?.metadataTableName,
                         pkColumns: plan?.pkColumns || [],
                         editLocator,
                         readOnly: forceReadOnlyResult || !editLocator || editLocator.readOnly,
@@ -7758,7 +7761,8 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
           id: windowId,
           sourceQueryTabId: tab.id,
           connectionId: currentConnectionId || tab.connectionId || '',
-          dbName: currentDb || tab.dbName || '',
+          // 独立窗也要带上结果表元数据所属库，否则列类型/注释会丢
+          dbName: target.metadataDbName || currentDb || tab.dbName || '',
           title,
           ...(preferred?.x !== undefined ? { x: preferred.x } : {}),
           ...(preferred?.y !== undefined ? { y: preferred.y } : {}),
@@ -7774,7 +7778,9 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
               columns: target.columns,
               messages: target.messages,
               resultType: target.resultType,
-              tableName: target.tableName,
+              tableName: target.metadataTableName || target.tableName,
+              metadataDbName: target.metadataDbName,
+              metadataTableName: target.metadataTableName,
               pkColumns: target.pkColumns || [],
               editLocator: target.editLocator as any,
               readOnly: target.readOnly !== false,
@@ -7811,6 +7817,8 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
                       messages: Array.isArray(restored.messages) ? restored.messages : undefined,
                       resultType: restored.resultType === 'message' ? 'message' : 'grid',
                       tableName: restored.tableName,
+                      metadataDbName: restored.metadataDbName,
+                      metadataTableName: restored.metadataTableName,
                       pkColumns: Array.isArray(restored.pkColumns) ? restored.pkColumns : [],
                       editLocator: restored.editLocator,
                       readOnly: restored.readOnly !== false,