docs: update changelog for v2026.4.346 with detailed release notes}
- Replace placeholder release entry with detailed feature and bugfix descriptions - Add AI-powered natural language to Redis command translation feature - Add multilingual AI support for 50+ languages - Add context-aware AI with Redis version, modules, and RediSearch index awareness - Add Groq API key configuration via settings dialog, CLI, and readonly mode - Add AI admin dashboard with real-time metrics and MongoDB persistence - Add auto-fallback from failed Redis commands to AI translation - Add explicit `ai:` prefix support for AI queries in console and search - Add bugfix for console output text selection and copy behavior