feat: Add full i18n support, security fixes, and zh-TW to Smart Mind Map plugin
- Consolidated smart_mind_map.py and smart_mind_map_cn.py into a single file.
- Added TRANSLATIONS dictionary supporting 18 languages (including explicit zh-TW support).
- Implemented robust language detection with fallback to browser/local storage.
- Added localized date formatting for various locales.
- Added base language fallback (e.g., fr-BE -> fr-FR) and variant mapping.
- Fixed critical security vulnerabilities:
- Prevented JS injection by safely escaping IDs with `json.dumps`.
- Prevented XSS by sanitizing user input and language codes.
- Prevented DoS crashes from curly braces in LLM output by replacing `.format()` with safe string replacement.
- Fixed regex regression by using standard strings with escaped backslashes.
- Restored clickable "Markmap" link in the footer.
- Verified all changes with comprehensive unit and security tests.
Co-authored-by: Fu-Jie <33599649+Fu-Jie@users.noreply.github.com>
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google-labs-jules[bot]