fix(asciidoc): handle commas in image alt text

[n0rdp0l]

Issue resolved by this Pull Request:
Resolves #2982

Description

Modified AsciiDocBackend._parse_picture() to gracefully handle commas in image alt text that are commonly generated by documentation
tools like Word/Doc2Help.

Previously, the parser would crash with ValueError: not enough values to unpack (expected 2, got 1) when alt text contained commas,
because it assumed all comma-separated values after the first were key=value attribute pairs.

Changes

• Modified _parse_picture() to check for = before attempting to unpack attributes
• Commas in alt text are now preserved and correctly reconstructed
• Used split('=', 1) to handle edge cases where attribute values contain = characters
• Added test case with realistic auto-generated alt text containing commas

Testing

• Added test case in test_parse_picture() covering commas in alt text
• All existing AsciiDoc tests pass
• Pre-commit checks (ruff, mypy) pass

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

[github-actions]

✅ DCO Check Passed

Thanks @n0rdp0l, all your commits are properly signed off. 🎉

[dosubot]

Related Documentation

Checked 14 published document(s) in 1 knowledge base(s). No updates required.

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[cau-git]

@n0rdp0l thanks for this contribution. Could you please rebase to main, it brings a fix for the failing test-pip-install-no-lock Ci check in.

[dolfim-ibm]

lgtm