Merge PR winfunc#424: i18n Internationalization (12 languages)

Resolves conflicts by combining:
- Filesystem agent source detection from PR winfunc#397
- MCP server start/stop controls from PR winfunc#428
- i18n translations from PR winfunc#424

Author: Marlon Costa

bun.lock

@@ -48,11 +48,14 @@
     "diff": "^8.0.2",
     "framer-motion": "^12.0.0-alpha.1",
     "html2canvas": "^1.4.1",
+    "i18next": "^25.7.3",
+    "i18next-browser-languagedetector": "^8.2.0",
     "lucide-react": "^0.468.0",
     "posthog-js": "^1.258.3",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-hook-form": "^7.54.2",
+    "react-i18next": "^16.5.1",
     "react-markdown": "^9.0.3",
     "react-syntax-highlighter": "^15.6.1",
     "recharts": "^2.14.1",