docs(phase-34): evolve PROJECT.md after phase completion

.planning/PROJECT.md

@@ -67,6 +67,8 @@ Help people make better gear decisions — discover what others use, compare rea
 
 ### Active
 
+- ✓ i18n foundation: react-i18next framework, English + German locales, locale-aware formatting, language picker — v2.3
+
 ## Current Milestone: v2.3 Global & Social Ready
 
 **Goal:** Make GearBox work for a global audience with setup sharing, multi-currency support, and localization infrastructure.
@@ -98,7 +100,7 @@ Help people make better gear decisions — discover what others use, compare rea
 
 ## Context
 
-Shipped through v2.2 with 31 phases across 6 milestones. All milestones v1.0-v2.2 complete.
+Shipped through v2.2 with 31 phases across 6 milestones. All milestones v1.0-v2.2 complete. Phase 34 (i18n Foundation) complete — v2.3 in progress.
 Tech stack: React 19, Hono, Drizzle ORM, PostgreSQL, TanStack Router/Query, Tailwind CSS v4, Lucide React, Recharts, framer-motion, all on Bun.
 Primary use case is bikepacking gear but data model is hobby-agnostic.
 Auth: External OIDC via Logto (browser sessions) + API keys (programmatic) + MCP OAuth (Claude).