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ly-wang19 4b36cf451c fix(line): truncate template title/altText on grapheme boundaries, not raw UTF-16 (#97428 )

* fix(line): truncate template title/altText on grapheme boundaries, not raw UTF-16

createConfirmTemplate/createButtonTemplate/createTemplateCarousel/createCarouselColumn/
createImageCarousel truncated title and altText with a raw `.slice(0, N)`, so an
emoji straddling a LINE field limit (e.g. a 40-char button title) was cut in half,
leaving a lone high surrogate that LINE renders as the replacement char or rejects.
Route those fields through the file's existing grapheme-safe truncateTemplateText
(already used for the text body) via a small truncateOptionalTemplateText wrapper.
Byte-identical for all-BMP input; only straddling-emoji truncation changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* chore: retry OpenGrep scan (HTTP 502 infra flake)

* test(line): cover grapheme-safe template fields

---------

Co-authored-by: ly-wang19 <ly-wang19@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Vincent Koc <vincentkoc@ieee.org>

2026-06-28 11:59:59 -07:00