fix(vue): ensure onFocus/onBlur/onAssetUpload callbacks use latest reference

[zhiyun22]

Summary / 摘要

修复 Vue 包中 onFocus、onBlur、onAssetUpload 回调引用过时的问题，确保回调在配置变化后始终调用最新版本。

Motivation / 背景与动机

• Issue:
• Roadmap (docs/ROADMAP.md):
• OpenSpec change: fix-vue-callback-staleness

问题描述

packages/vue 的 useEditor 中，onChange 回调通过闭包 + resolveConfig() 动态获取最新引用，行为正确；但 onFocus、onBlur、onAssetUpload 通过 ...rest 直接传给 createEditor，在编辑器创建时被固定引用。当配置是响应式的（computed / getter）且回调引用变化时，这些回调仍使用创建时的旧版本，可能导致：

• 回调中访问到过期的闭包变量
• 与 onChange 行为不一致
• 依赖最新状态的场景下出现逻辑错误

Changes / 变更内容

• packages/vue:
  • use-editor.ts: 将 buildCreateConfig 移入 useEditor 作用域，为 onFocus、onBlur、onAssetUpload 创建包装函数，每次调用时通过 resolveConfig() 获取最新回调
  • editor-vue.test.ts: 新增 3 个测试用例，验证三个回调在配置更新后能调用最新版本

Testing / 测试

• pnpm test passes / 全绿
• Affected packages build (pnpm build) / 受影响包构建通过
• New / updated vitest cases / 新增或更新的 vitest 用例：
  • calls the latest onFocus after config updates
  • calls the latest onBlur after config updates
  • calls the latest onAssetUpload after config updates
• Manual UI check in electron-demo / electron-demo 手动验证：

测试命令

pnpm vitest run packages/vue

结果：18 tests passed（原有 15 个 + 新增 3 个）

Compliance / 合规自检

• CLA signed — first-time contributors will be prompted automatically by the CLA bot / 首次贡献者按 CLA 机器人提示签署
• AI disclosure: the functional code in this PR is not primarily generated by AI. AI assistance, if any, is described below.
  AI-assisted notes / AI 使用说明：
  AI-assisted code review and test case generation
• New dependencies (if any) listed with license & rationale (none if blank):
  
  无新增依赖
• No build artifacts committed (dist/, dist-electron/, compiled .js from .ts) / 未提交构建产物
• No secrets / .env / personal vault data committed / 无敏感信息

Checklist / 自检清单

• Title follows Conventional Commits / 标题遵循 Conventional Commits
• Public API changes update package README / types — 改了公共 API 已同步 README 与类型（无公共 API 变更）
• Touched live-preview-table.ts → walked through the 12 Table Widget rules in CLAUDE.md / 已核对 12 条表格规则（未涉及）
• New capability / breaking change → OpenSpec proposal linked / 新 capability 或破坏性变更已附 OpenSpec（bug fix，不需要 OpenSpec）
• Change aligns with project scope (GOVERNANCE.md §4) / 改动符合 GOVERNANCE.md §4 的项目范围

Screenshots / Recordings · 截图或录屏 (UI changes)

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