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LinYushen d013a31db9 fix: escape special chars in image alt and file-card filename (MUL-2899) (#3644)
* fix: escape special chars in image alt and file-card filename during Markdown serialization

Filenames containing Markdown label characters ([, ], \, (, )) broke
the ![alt](url) and !file[name](url) syntax, causing raw Markdown to
render instead of the image/file card.

- Add shared escapeMarkdownLabel utility
- Apply escaping in file-card renderMarkdown
- Add renderMarkdown to ImageExtension for alt text escaping
- Add regression tests

Closes #3616

Co-authored-by: multica-agent <github@multica.ai>

* fix: address review — fix tokenizer regex, unescape labels, add regression tests

- Remove unused tokenizeFn (TS6133)
- Change file-card regex to (?:\\.|[^\]])* to handle escaped brackets
- Unescape labels in tokenize() and preprocessFileCards()
- Export ImageExtension for testability
- Rewrite tests: 3 describe blocks covering ImageExtension.renderMarkdown,
  file-card tokenizer round-trip, and preprocessFileCards (6 tests total)
- typecheck and vitest both pass

Co-authored-by: multica-agent <github@multica.ai>

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Co-authored-by: multica-agent <github@multica.ai>
2026-06-02 14:33:45 +08:00
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