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/projects/ProjectModal.tsx

@@ -109,7 +109,6 @@ export function ProjectModal({ project, onClose, onSuccess }: ProjectModalProps)
   });
   const { data: clientList } = trpc.clientEntity.list.useQuery(undefined, { staleTime: 60_000 });
 
-  // @ts-expect-error TS2589: tRPC infers union type too deeply for CreateProjectSchema with .refine()
   const createMutation = trpc.project.create.useMutation({
     onSuccess: async () => {
       await utils.project.listWithCosts.invalidate();