refactor: 对齐 MetonaEditor — babel-jest 替代 ts-jest

### Changed
- 测试框架: ts-jest → babel-jest (对齐 MetonaEditor 生产方案)
- jest.config.cjs: babel-jest transform + moduleNameMapper
- test 脚本: jest → jest --coverage (对齐 MetonaEditor)
- 移除 ts-jest, 新增 @babel/core/preset-env/preset-typescript/babel-jest

### Added
- babel.config.cjs (对齐 MetonaEditor)

### Fixed
- 恢复 tslib (@rollup/plugin-typescript 必需依赖)

### Verified
- tsc --noEmit: 零错误
- jest --no-coverage: 136/136 passed
- rollup build: 5 outputs

jest.config.cjs

@@ -1,20 +1,7 @@
-/** @type {import('ts-jest').JestConfigWithTsJest} */
 module.exports = {
-  preset: 'ts-jest',
   testEnvironment: 'jsdom',
   transform: {
-    '^.+\\.ts$': ['ts-jest', {
-      tsconfig: {
-        target: 'ES2020',
-        module: 'ESNext',
-        moduleResolution: 'node',
-        esModuleInterop: true,
-        strict: true,
-        lib: ['ES2020', 'DOM', 'DOM.Iterable'],
-        allowImportingTsExtensions: true,
-        noEmit: true,
-      },
-    }],
+    '^.+\\.ts$': 'babel-jest',
   },
   moduleNameMapper: {
     '^(\\.{1,2}/.*)\\.js$': '$1',