✨ feat(query): 新建查询继承当前表上下文 (#874)

## 变更说明

- 当前活动标签为表数据页或表设计页时，新建查询会自动继承连接、数据库和表名上下文
- 按数据库方言正确引用表名，并为 Elasticsearch 生成原生查询模板
- 只有活动表与用户最新选择的连接、数据库一致时，才继承表名，避免跨数据库误带旧表上下文
- 无有效表上下文时保持原有新建查询行为
- 自定义模板仅在以 FROM 结尾、存在明确表名插入点时自动补全，避免破坏用户模板

## 验证

- `npm test -- src/components/QueryEditor.external-sql-save.test.tsx
src/utils/newQueryContext.test.ts
src/utils/objectQueryTemplates.test.ts`：344 项测试通过
- `npm run build`：TypeScript 与 Vite 生产构建通过
- 已基于最新 `dev`（包含 #872/#870/#875）解决 `App.tsx` 冲突

Closes #849

frontend/src/App.tsx

@@ -102,6 +102,8 @@ import {
 import { downloadBrowserTextFile } from './utils/browserFileTransfer';
 import { buildDataSyncWorkbenchTab } from './utils/dataSyncTab';
 import { buildSqlAuditWorkbenchTab } from './utils/sqlAuditTab';
+import { resolveDataSourceType } from './utils/dataSourceCapabilities';
+import { buildContextualNewQueryTemplate } from './utils/objectQueryTemplates';
 import {
   extractCustomThemeAntTokens,
 } from './utils/customTheme';
@@ -236,7 +238,7 @@ import {
 import { useAppUpdateManager } from './hooks/useAppUpdateManager';
 import { useAppLogPanelResize } from './hooks/useAppLogPanelResize';
 import { useAppSidebarResize } from './hooks/useAppSidebarResize';
-import { resolveNewQueryContext } from './utils/newQueryContext';
+import { canInheritNewQueryTableContext, resolveNewQueryContext } from './utils/newQueryContext';
 import { useAppUtilityStyles } from './hooks/useAppUtilityStyles';
 import { useWorkbenchTabs } from './hooks/useWorkbenchTabs';
 import {
@@ -2728,6 +2730,19 @@ function App() {
           activeTab: currentTab,
           validConnectionIds: new Set(connections.map(connection => connection.id)),
       });
+      const connection = connections.find(c => c.id === targetContext.connectionId);
+      const inheritsTableContext = canInheritNewQueryTableContext({
+          activeTab: currentTab,
+          targetContext,
+      });
+      const tableName = inheritsTableContext ? String(currentTab?.tableName || '').trim() : '';
+      const contextualQuery = tableName && connection
+          ? buildContextualNewQueryTemplate({
+              dbType: resolveDataSourceType(connection.config),
+              tableName,
+              customTemplate: appearance.newQuerySqlTemplate,
+          })
+          : null;
 
       addTab({
           id: `query-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
@@ -2735,9 +2750,9 @@ function App() {
           type: 'query',
           connectionId: targetContext.connectionId,
           dbName: targetContext.dbName,
-          query: ''
+          query: contextualQuery ?? '',
       });
-  }, [activeTabId, tabs, connections, activeContext, addTab, t]);
+  }, [activeTabId, tabs, connections, activeContext, addTab, appearance.newQuerySqlTemplate, t]);
 
   const switchActiveTabByOffset = useCallback((offset: 1 | -1) => {
       if (tabs.length < 2) return;

frontend/src/utils/newQueryContext.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest';
 
-import { resolveNewQueryContext } from './newQueryContext';
+import { canInheritNewQueryTableContext, resolveNewQueryContext } from './newQueryContext';
 
 describe('resolveNewQueryContext', () => {
   const validConnectionIds = new Set(['conn-a', 'conn-b']);
@@ -44,4 +44,20 @@ describe('resolveNewQueryContext', () => {
       validConnectionIds,
     })).toEqual({ connectionId: '', dbName: '' });
   });
+
+  it('only inherits a table tab when it belongs to the resolved target context', () => {
+    const tableTab = { type: 'table', connectionId: 'conn-a', dbName: 'database_a', tableName: 'users' };
+    expect(canInheritNewQueryTableContext({
+      activeTab: tableTab,
+      targetContext: { connectionId: 'conn-a', dbName: 'database_a' },
+    })).toBe(true);
+    expect(canInheritNewQueryTableContext({
+      activeTab: tableTab,
+      targetContext: { connectionId: 'conn-b', dbName: 'database_b' },
+    })).toBe(false);
+    expect(canInheritNewQueryTableContext({
+      activeTab: { ...tableTab, type: 'query' },
+      targetContext: { connectionId: 'conn-a', dbName: 'database_a' },
+    })).toBe(false);
+  });
 });

frontend/src/utils/newQueryContext.ts

@@ -35,3 +35,20 @@ export const resolveNewQueryContext = ({
   || normalizeValidContext(activeTab, validConnectionIds)
   || { connectionId: '', dbName: '' }
 );
+export interface NewQueryTableContextLike extends NewQueryContextLike {
+  type?: unknown;
+  tableName?: unknown;
+}
+
+export const canInheritNewQueryTableContext = ({
+  activeTab,
+  targetContext,
+}: {
+  activeTab?: NewQueryTableContextLike | null;
+  targetContext: NewQueryContext;
+}): boolean => {
+  const tabType = String(activeTab?.type || '');
+  return (tabType === 'table' || tabType === 'design')
+    && String(activeTab?.connectionId || '').trim() === targetContext.connectionId
+    && String(activeTab?.dbName || '').trim() === targetContext.dbName;
+};

frontend/src/utils/objectQueryTemplates.test.ts

@@ -9,12 +9,47 @@ vi.mock('../../wailsjs/go/app/App', () => ({
 }));
 
 import {
+  buildContextualNewQueryTemplate,
   buildTableSelectQuery,
   extractTableSelectColumnNames,
   isElasticsearchDbType,
   resolveTableSelectQuery,
 } from './objectQueryTemplates';
 
+describe('buildContextualNewQueryTemplate', () => {
+  it('builds a dialect-aware select for the active table with the default template', () => {
+    expect(buildContextualNewQueryTemplate({
+      dbType: 'mysql',
+      tableName: 'Order Items',
+      customTemplate: null,
+    })).toBe('SELECT * FROM `Order Items`;');
+  });
+
+  it('appends the active table when a custom template ends with FROM', () => {
+    expect(buildContextualNewQueryTemplate({
+      dbType: 'postgres',
+      tableName: 'public.OrderItems',
+      customTemplate: 'SELECT id, total FROM ',
+    })).toBe('SELECT id, total FROM public."OrderItems"');
+  });
+
+  it('preserves custom templates that do not expose a table insertion point', () => {
+    expect(buildContextualNewQueryTemplate({
+      dbType: 'mysql',
+      tableName: 'users',
+      customTemplate: 'SELECT CURRENT_TIMESTAMP;',
+    })).toBeNull();
+  });
+
+  it('builds the native query format for an active Elasticsearch index', () => {
+    expect(buildContextualNewQueryTemplate({
+      dbType: 'elasticsearch',
+      tableName: 'orders-v1',
+      customTemplate: null,
+    })).toBe('GET /orders-v1/_search\n{\n  "query": {\n    "match_all": {}\n  }\n}\n');
+  });
+});
+
 describe('buildTableSelectQuery', () => {
   it('quotes uppercase postgres table names in new query templates', () => {
     expect(buildTableSelectQuery('postgres', 'public.MyTable')).toBe('SELECT * FROM public."MyTable";');

frontend/src/utils/objectQueryTemplates.ts

@@ -59,6 +59,34 @@ export const buildTableSelectQuery = (
   return `SELECT\n  ${selectList}\nFROM ${quotedTable}${limitSuffix};`;
 };
 
+type BuildContextualNewQueryTemplateOptions = {
+  dbType: string;
+  tableName: string;
+  customTemplate?: string | null;
+};
+
+/**
+ * Build the initial query for a new tab opened while a table-like data tab is active.
+ * A custom template is only augmented when it explicitly ends at a FROM insertion point.
+ */
+export const buildContextualNewQueryTemplate = ({
+  dbType,
+  tableName,
+  customTemplate,
+}: BuildContextualNewQueryTemplateOptions): string | null => {
+  const normalizedTableName = String(tableName || '').trim();
+  if (!normalizedTableName) return null;
+  if (isElasticsearchDbType(dbType) || customTemplate === null || customTemplate === undefined) {
+    return buildTableSelectQuery(dbType, normalizedTableName);
+  }
+
+  const template = String(customTemplate)
+    .replace(/\r\n/g, '\n')
+    .replace(/\r/g, '\n');
+  if (!/\bfrom\s*$/i.test(template)) return null;
+  return `${template}${quoteQualifiedIdent(dbType, normalizedTableName)}`;
+};
+
 type ResolveTableSelectQueryOptions = {
   dbType: string;
   tableName: string;