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>

pnpm-lock.yaml

@@ -674,6 +674,9 @@ importers:
       "@testing-library/react":
         specifier: ^16.0.0
         version: 16.3.2(@testing-library/dom@10.4.1)(@types/react-dom@19.2.3(@types/react@19.2.14))(@types/react@19.2.14)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      "@trpc/client":
+        specifier: ^11.18.0
+        version: 11.18.0(@trpc/server@11.18.0(typescript@5.9.3))(typescript@5.9.3)
       "@types/react":
         specifier: ^19.0.0
         version: 19.2.14
@@ -689,6 +692,9 @@ importers:
       react:
         specifier: ^19.0.0
         version: 19.2.4
+      superjson:
+        specifier: ^2.2.1
+        version: 2.2.6
       typescript:
         specifier: ^5.8.0
         version: 5.9.3