Chinese web-novel TXT files are commonly named 【书名】1-129 作者：起落.txt and
carry a noisy metadata block at the top of the file. Two author-recognition
failures resulted after importing them:
1. Author missing — extractTxtFilenameMetadata only pulled an author from
《》-wrapped names, so 【】-style names yielded no filename author, and when
the file header had no clean "作者：X" line the author came out empty.
2. Irrelevant content as author — the greedy file-header capture
(/作者…(.+)\r?\n/) grabbed a publication blob like
"2024/08/01发表于：是否首发：是 字数1023150字…" and surfaced it as the author.
Fix:
- extractTxtFilenameMetadata now extracts the labeled "作者：X" form from any
filename (title stays the full name; only the labeled form is safe so a
leading 【title】 isn't mistaken for the author).
- Validate the header-matched author (isPlausibleAuthorName) and fall back to
the filename author when it looks like a metadata blob — embedded field
separator, long digit run, or excessive length. Applied to both the small-
and large-file conversion paths.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
df66c63a07