feat(web): give block editor an accessible dialog label

Expose role=dialog and a stable aria-label so save can be scoped
without changing the modal's visuals or save behavior.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/components/doc/BlockEditorModal.tsx

@@ -23,6 +23,7 @@ import {
 } from 'lucide-react';
 import katex from 'katex';
 import { renderInlineMarkdown } from '../../engine/renderMarkdown';
+import { BLOCK_EDITOR_DIALOG_LABEL, BLOCK_EDITOR_SAVE_NAME } from '../../lib/blockEditorDialog';
 
 interface BlockEditorModalProps {
   block: DocumentBlock;
@@ -216,6 +217,9 @@ export const BlockEditorModal: React.FC<BlockEditorModalProps> = ({ block, onSav
 
   return (
     <div
+      role="dialog"
+      aria-modal="true"
+      aria-label={BLOCK_EDITOR_DIALOG_LABEL}
       style={{
         position: 'fixed',
         inset: 0,
@@ -973,7 +977,7 @@ export const BlockEditorModal: React.FC<BlockEditorModalProps> = ({ block, onSav
               }}
             >
               <Check size={14} />
-              <span>保存修改</span>
+              <span>{BLOCK_EDITOR_SAVE_NAME}</span>
             </button>
           </div>
         </div>

web/src/lib/blockEditorDialog.test.ts

@@ -0,0 +1,28 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  BLOCK_EDITOR_DIALOG_LABEL,
+  BLOCK_EDITOR_SAVE_NAME,
+  blockEditorDialogPolicy,
+} from './blockEditorDialog';
+
+describe('blockEditorDialogPolicy', () => {
+  it('pins an accessible dialog label and exact save name', () => {
+    const policy = blockEditorDialogPolicy();
+    assert.equal(policy.role, 'dialog');
+    assert.equal(policy.name, '编辑受控块');
+    assert.equal(policy.name, BLOCK_EDITOR_DIALOG_LABEL);
+    assert.equal(policy.saveButton.name, '保存修改');
+    assert.equal(policy.saveButton.name, BLOCK_EDITOR_SAVE_NAME);
+    assert.equal(policy.saveButton.exact, true);
+  });
+
+  it('rejects page-wide fuzzy /保存/ that would hit private-library buttons', () => {
+    const policy = blockEditorDialogPolicy();
+    const privateLibrary = '一键保存到我的私密文档库';
+    assert.match(privateLibrary, policy.forbidPageWideSaveRegex);
+    assert.equal(policy.saveButton.name === '保存修改', true);
+    assert.doesNotMatch(policy.saveButton.name, /^一键保存/);
+    assert.equal(policy.forbidPageWideSaveRegex.source, '保存修改|保存');
+  });
+});

web/src/lib/blockEditorDialog.ts

@@ -0,0 +1,17 @@
+/** 块编辑弹窗的稳定可访问名称与保存按钮文案（禁止全页模糊 /保存/）。 */
+export const BLOCK_EDITOR_DIALOG_LABEL = '编辑受控块';
+export const BLOCK_EDITOR_SAVE_NAME = '保存修改';
+
+export function blockEditorDialogPolicy(): {
+  role: 'dialog';
+  name: typeof BLOCK_EDITOR_DIALOG_LABEL;
+  saveButton: { name: typeof BLOCK_EDITOR_SAVE_NAME; exact: true };
+  forbidPageWideSaveRegex: RegExp;
+} {
+  return {
+    role: 'dialog',
+    name: BLOCK_EDITOR_DIALOG_LABEL,
+    saveButton: { name: BLOCK_EDITOR_SAVE_NAME, exact: true },
+    forbidPageWideSaveRegex: /保存修改|保存/,
+  };
+}