Canvas text rendering fails in multilingual apps beyond English and Japanese

Canvas 2D text rendering breaks for Latin languages when tuned only for Japanese and English, with French and Portuguese text 1.4-1.7x longer and Spanish up to 3x. Four failure patterns include word-wrapping collapsing on CJK, ASCII tokenizers splitting accented characters, critical words vanishing into ellipsis, and preview-PNG line break mismatches. The fixes involve auto-fitting font sizes and centralizing measurement logic across all locales.