CueMode v3.0.0

CueMode v3.0.0\n\nA major release focused on Presentation Mode readiness, polished developer UX, and full localization parity.\n\n### ✨ Highlights\n- Production-ready Presentation Mode for slide-like markdown delivery\n- Full i18n synchronization across 6 languages (EN, ZH-CN, DE, FR, JA, KO)\n- Enhanced code demo readability with real line-break markers\n- Cleaner activation and interaction flow for distraction-free presenting\n- Documentation and site refresh for 3.0\n\n### ✅ Quality\n- Compile, lint, and test pipeline validated before release\n- Unit/integration coverage remains healthy\n\n### 🔗 Links\n- Marketplace: https://marketplace.visualstudio.com/items?itemName=luckyXmobile.cuemode\n- Repository: https://github.com/hddevteam/cuemode