* Create ko.json * Update ko.json * Update i18n.rs * Fonts: add a Hangul fallback so Korean doesn't render as boxes Only the first CJK font found was loaded, and on Windows and macOS that is a Japanese font without Hangul (Meiryo, Hiragino). Load the first readable font of each group: the existing CJK list, then Malgun Gothic (Windows), Apple SD Gothic Neo (macOS) or Nanum Gothic (Linux). Also rustfmt the Korean catalog test. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT --------- Co-authored-by: bherbruck <brennen.herbruck@gmail.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>