🔧 chore(dev): 合并 open issue backlog 修复分支

- 合并已按 issue 拆分提交的 backlog 修复与 SQL 结果集同步能力
- 解决 DataGrid、Sidebar 以及 legacy WebKit 存储迁移测试的合并冲突
- 保留 dev 分支当前结构并移除已废弃的 issue backlog 跟踪文档

frontend/src/utils/aiMarkdown.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from 'vitest';
+
+import { normalizeAiMarkdown } from './aiMarkdown';
+
+describe('normalizeAiMarkdown', () => {
+  it('inserts a missing newline after the fenced code language marker', () => {
+    expect(normalizeAiMarkdown('```sqlSELECT COUNT(*) AS order_count\nFROM customer_order;\n```')).toBe(
+      '```sql\nSELECT COUNT(*) AS order_count\nFROM customer_order;\n```',
+    );
+  });
+});

frontend/src/utils/aiMarkdown.ts

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+export const normalizeAiMarkdown = (content: string): string => {
+  let text = String(content || '').replace(/\r\n/g, '\n');
+  const knownFenceLanguages = [
+    'sql', 'mermaid', 'json', 'javascript', 'typescript', 'ts', 'js', 'tsx', 'jsx',
+    'bash', 'sh', 'shell', 'python', 'py', 'go', 'java', 'yaml', 'yml', 'html', 'css',
+    'xml', 'markdown', 'md', 'text', 'plaintext', 'vue', 'php', 'ruby', 'rust', 'toml',
+    'ini', 'diff',
+  ];
+  const fencePattern = new RegExp(`(^|\\n)\`\`\`(${knownFenceLanguages.join('|')})([^\\n])`, 'gi');
+  text = text.replace(fencePattern, '$1```$2\n$3');
+  text = text.replace(/([^\n])```(?=\n|$)/g, '$1\n```');
+  return text;
+};

frontend/src/utils/objectQueryTemplates.test.ts

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+import { describe, expect, it } from 'vitest';
+
+import { buildTableSelectQuery } from './objectQueryTemplates';
+
+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

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+import { quoteQualifiedIdent } from './sql';
+
+export const buildTableSelectQuery = (dbType: string, tableName: string): string => {
+  const normalizedTableName = String(tableName || '').trim();
+  if (!normalizedTableName) {
+    return 'SELECT * FROM ';
+  }
+  return `SELECT * FROM ${quoteQualifiedIdent(dbType, normalizedTableName)};`;
+};

frontend/src/utils/windowStateUi.test.ts

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+import { describe, expect, it } from 'vitest';
+
+import { resolveTitleBarToggleIconKey, shouldToggleMaximisedWindowForScaleFix } from './windowStateUi';
+
+describe('windowStateUi', () => {
+  it('does not re-toggle a maximized window on activation when focus returns', () => {
+    expect(shouldToggleMaximisedWindowForScaleFix('activation', true)).toBe(false);
+  });
+
+  it('switches the titlebar toggle icon to restore when the window is maximized', () => {
+    expect(resolveTitleBarToggleIconKey('maximized')).toBe('restore');
+  });
+});

frontend/src/utils/windowStateUi.ts

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+export type WindowVisualState = 'normal' | 'maximized' | 'fullscreen';
+export type WindowScaleFixReason = 'activation' | 'ratio-change';
+export type TitleBarToggleIconKey = 'maximize' | 'restore';
+
+export const shouldToggleMaximisedWindowForScaleFix = (
+  reason: WindowScaleFixReason,
+  hasViewportScaleDrift: boolean,
+): boolean => reason === 'ratio-change' && hasViewportScaleDrift;
+
+export const resolveTitleBarToggleIconKey = (windowState: WindowVisualState): TitleBarToggleIconKey =>
+  windowState === 'maximized' ? 'restore' : 'maximize';