test/cjk

[uxjulia]

Summary

• Add CJK-aware EPUB tokenization so SD-card CJK fonts can wrap book text at character boundaries without inserting artificial spaces.
• Add basic CJK punctuation line-break rules so opening punctuation stays with the following token and closing punctuation stays with the previous token.
• Detect CJK EPUB language metadata to disable Latin-centric bionic/guide layout and skip SD-font text anti-alias grayscale to reduce heap pressure.
• Bump the EPUB section cache version and add focused UTF-8 CJK helper tests.

Validation

• git diff --check
• cmake --build test/build --target Utf8CjkTest && ctest --test-dir test/build -R Utf8CjkTest --output-on-failure
• pio run -e simulator
• pio run -e default