The server counted code points while the Library's JavaScript counts UTF-16
units, so a first line of emoji kept 80 emoji on cards but showed 40 in the
Library. Both now cut at 80 UTF-16 units and drop a character that would
straddle the limit instead of leaving half a surrogate pair.
Summaries gain title_source (stored or text). The inspector always shows a
stored title and confirms only a first-line title against the file, so a
stored title equal to the first line is no longer withheld. A link-title read
failure no longer marks a readable link unavailable. First-line titles over
80 characters end with an ellipsis, as the Library's title() does. The card
gate for unconfirmed first-line titles is pinned as an expected failure for B2.