✨ feat(tabs): 支持标签展示配置并提示保存 SQL 文件

- 新增标签展示元素配置，支持单行、双行布局和元素排序

- 在设置面板提供标签展示入口并持久化用户配置

- 标签右键菜单增加标签设置入口并优化悬浮信息展示

- 关闭外部 SQL 文件标签前检测未保存草稿并支持保存后关闭

frontend/src/utils/sqlFileTabDrafts.ts

@@ -0,0 +1,44 @@
+const drafts = new Map<string, string>();
+
+const toTabId = (value: unknown): string => String(value ?? '').trim();
+
+export const setQueryTabDraft = (tabId: string, content: string): void => {
+  const id = toTabId(tabId);
+  if (!id) return;
+  drafts.set(id, String(content ?? ''));
+};
+
+export const getQueryTabDraft = (tabId: string, fallback = ''): string => {
+  const id = toTabId(tabId);
+  if (!id || !drafts.has(id)) {
+    return fallback;
+  }
+  return drafts.get(id) ?? fallback;
+};
+
+export const clearQueryTabDraft = (tabId: string): void => {
+  const id = toTabId(tabId);
+  if (!id) return;
+  drafts.delete(id);
+};
+
+export const hasQueryTabDraft = (tabId: string): boolean => {
+  const id = toTabId(tabId);
+  return Boolean(id && drafts.has(id));
+};
+
+export const setSQLFileTabDraft = (tabId: string, content: string): void => {
+  setQueryTabDraft(tabId, content);
+};
+
+export const getSQLFileTabDraft = (tabId: string, fallback = ''): string => {
+  return getQueryTabDraft(tabId, fallback);
+};
+
+export const clearSQLFileTabDraft = (tabId: string): void => {
+  clearQueryTabDraft(tabId);
+};
+
+export const hasSQLFileTabDraft = (tabId: string): boolean => {
+  return hasQueryTabDraft(tabId);
+};