The detail view's filmstrip shortened a long file name with `&name[..13]`,
a byte slice. For a name with multi-byte characters byte 13 can fall
inside a character (`202407層三限定訂閱圖(4)`: inside '限'), and the
slice panicked the UI thread as soon as that photo scrolled into the
strip, so the app quit.
`film_label` now counts characters: more than 14 are cut to 13 and an
ellipsis, as before for ASCII names.
Tests: a unit test of `film_label` (CJK, exactly 14 characters, ASCII,
empty) and a headless filmstrip test with the name from the issue; both
panicked with the reported message before the fix.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
wstockandClaude Opus 5.5
c60482f753