feat(i18n): install react-i18next, create English locale files, and initialize i18n framework

- Install i18next, react-i18next, i18next-browser-languagedetector
- Create 6 namespace JSON files (common, collection, threads, setups, onboarding, settings)
- Initialize i18n with language detection (localStorage + navigator)
- Wire i18n import in main.tsx before React rendering

Phase 34, Plan 01

package.json

@@ -48,11 +48,14 @@
 		"drizzle-orm": "^0.45.1",
 		"framer-motion": "^12.38.0",
 		"hono": "^4.12.8",
+		"i18next": "^26.0.4",
+		"i18next-browser-languagedetector": "^8.2.1",
 		"lucide-react": "^0.577.0",
 		"postgres": "^3.4.9",
 		"react": "^19.2.4",
 		"react-dom": "^19.2.4",
 		"react-easy-crop": "^5.5.7",
+		"react-i18next": "^17.0.2",
 		"recharts": "^3.8.0",
 		"sharp": "^0.34.5",
 		"sonner": "^2.0.7",