fix(core-consent): build consent router from the shared superjson t

The router previously created its own initTRPC without superjson while
the app router uses the shared transformer-enabled instance — a wire
transformer mismatch that corrupts inputs (audit finding A10). Procedures
now build on @repo/core-shared/trpc/init's t; a real client+fetch-adapter
round-trip test pins Date revival through appRouter-style mounting.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/core-consent/package.json

@@ -36,8 +36,10 @@
     "@repo/core-testing": "workspace:*",
     "@repo/core-typescript": "workspace:*",
     "@testing-library/react": "^16.0.0",
+    "@trpc/client": "^11.18.0",
     "@types/react": "^19.0.0",
     "@vitest/coverage-v8": "^3.2.7",
+    "superjson": "^2.2.1",
     "jsdom": "^25.0.0",
     "payload": "^3.14.0",
     "react": "^19.0.0",