Zettelkasten breaks internal links

I mutated the test case 'Multiple enex files with interEnex links' to use zettelkasten
```json
"isZettelkastenNeeded": true,
"useZettelIdAsFilename": true,
```
[yarle-special-cases.spec.ts.txt](https://github.com/user-attachments/files/16103275/yarle-special-cases.spec.ts.txt)
[test-internotebook_links_A/Table of Contents.md](https://github.com/user-attachments/files/16103282/Table.of.Contents.md)
[test-internotebook_links_B/Table of Contents.md](https://github.com/user-attachments/files/16103286/Table.of.Contents.md)
[test-internotebook_links_B/Note in Notebook B.md](https://github.com/user-attachments/files/16103285/Note.in.Notebook.B.md)

which gives as temporary output (because I commented `afterEach`'s `utils.clearMdNotesDistDir();`)

[out.zip](https://github.com/user-attachments/files/16103294/out.zip)

(currently on git commit v6.13.0 68bbe514)

Start with the attached “Multiple enex files with interEnex links” case in yarle-special-cases.spec.ts.txt and compare its generated Table of Contents.md and Note in Notebook B.md files under the two Zettelkasten options. Trace how those internal links are resolved, then verify that links between the converted notes work correctly with the test cleanup restored.

由索引模型根据 Issue 内容生成。