chore(root): upgrade typescript to v6

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: gracefullight

.agents/skills/oma-backend/variants/node/tech-stack.md

@@ -2,7 +2,7 @@
 
 ## Primary Stack
 - **Runtime**: Node.js 22+ / Bun 1.2+
-- **Language**: TypeScript 5.x (strict mode)
+- **Language**: TypeScript 6.x (strict mode)
 - **Framework**: NestJS 11+ or Hono 4+
 - **ORM**: Prisma 6+ or Drizzle ORM
 - **Validation**: Zod

apps/web/bun.lock

@@ -60,7 +60,7 @@
     "orval": "^8.5.0",
     "postcss": "^8.5.6",
     "tailwindcss": "^4.2.1",
-    "typescript": "^5.9.3",
+    "typescript": "^6.0.0",
     "vitest": "^4.0.18"
   }
 }

apps/web/package.json

@@ -18,7 +18,7 @@
     "@types/node": "^24",
     "chokidar": "^5.0.0",
     "tsx": "^4.21.0",
-    "typescript": "^5",
+    "typescript": "^6",
     "vitest": "^4"
   }
 }