v0.3.4 - English and Chinese interface

What's changed

• Added a saved language selector for English and Chinese.
• Localized visible game controls, status text, move history, recent match summaries, and key ARIA labels.
• Preserved compatibility with older saved recent-match summaries.
• Updated README, roadmap, accessibility notes, changelog, and package metadata.

Verification

• Node syntax checks passed for src/engine.js and src/main.js.
• Node test suite passed: 15 tests.
• Local browser smoke checks passed for default English, Chinese switching, persistence, move labels, recent-match summaries, and mobile layout.
• GitHub Actions CI and Pages deployment passed.