@mentions and /commands now recognize Chinese, Japanese, and Korean sentence-ending punctuation (。, 、, ？, ！) as valid word boundaries. Previously, typing @filename or /command immediately after CJK punctuation would not be recognized.
Evidence
Regex patterns updated from /(^|\s)/ to /(^|[\s。、？！])/ in mention and slash command parsers (search for "。、？！")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
