fix(types): flatten tRPC Zod schema types to resolve TS2589 inference depth errors

Cast Zod schemas with .refine()/.superRefine() to z.ZodType<InferredType> at the
procedure level. This short-circuits TypeScript's deep type recursion through
tRPC's middleware chain, eliminating 4 of 5 @ts-expect-error TS2589 suppressions
in web components (VacationModal, ProjectModal, UsersClient, CountriesClient).

Applied same pattern to allocation, timeline, staffing, dashboard, project, and
resource query/mutation procedures to reduce client-side type depth.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/admin/UsersClient.tsx

@@ -155,7 +155,6 @@ export function UsersClient() {
     onError: (err) => setActionError(err.message),
   });
 
-  // @ts-expect-error TS2589: tRPC infers union type too deeply for nullable overrides schema
   const setPermissionsMutation = trpc.user.setPermissions.useMutation({
     onSuccess: async () => {
       await utils.user.list.invalidate();