feat(workforce): keep the hourly rate off the workers roster

The Rate / hr column put every worker's wage on a wide table that is
glanceable, projected and exported. The rate already lives on the worker
detail page, where it is a deliberate lookup.

Drop the column from the roster and the rate from its CSV export — the
export is the wider accidental leak, since that file gets emailed and
opened on shared machines. Site managers can still see a worker's rate by
opening the worker, which stays deliberate access.

src/app/dashboard/workforce/workers/employees-view.test.tsx

@@ -7,7 +7,7 @@ import { EmployeesView } from "./employees-view";
 it("keeps worker assignments read-only until the edit sheet is opened", () => {
   const html = renderToStaticMarkup(<EmployeesView rows={[{
     id: "worker000000001", name: "Test worker", employeeNo: "01", workerType: "casual",
-    position: "Labourer", ratePerHour: 40, projectCode: "ONE", siteId: "site00000000001",
+    position: "Labourer", projectCode: "ONE", siteId: "site00000000001",
     employerId: "broker000000001", employerName: "Labour broker",
   }]} showSiteColumn={false} positions={[]} employers={[{ id: "broker000000001", name: "Labour broker", site: "site00000000001" }]} />);
   expect(html).toContain("Labour broker");
@@ -20,4 +20,6 @@ it("keeps worker assignments read-only until the edit sheet is opened", () => {
   const roster = html.slice(html.indexOf("<tbody"), html.indexOf("</tbody>"));
   expect(roster).not.toContain("<select");
   expect(html).not.toContain("Save changes");
+  // The hourly rate lives on the worker detail page only — never in the roster.
+  expect(html).not.toContain("Rate / hr");
 });

src/app/dashboard/workforce/workers/employees-view.tsx

@@ -24,7 +24,6 @@ import {
   SelectValue,
 } from "@/components/ui/select";
 import { Pagination } from "@/components/ui/pagination";
-import { formatCurrency } from "@/lib/utils";
 import { DropdownMenu, DropdownMenuTrigger, DropdownMenuContent, DropdownMenuItem, DropdownMenuSeparator } from "@/components/ui/dropdown-menu";
 import { AddWorkerDialog } from "@/components/add-worker-dialog";
 import { WorkerQrBatchDialog } from "@/components/worker-qr-batch-dialog";
@@ -47,7 +46,6 @@ export interface EmployeeRow {
   weekActivity?: ActivityDay[];
   position: string;
   workerType: "permanent" | "casual";
-  ratePerHour: number;
   projectCode: string;
 }
 
@@ -214,7 +212,6 @@ export function EmployeesView({
                   <TableHead>Position / type</TableHead>
                   {showSiteColumn && <TableHead>Project</TableHead>}
                   <TableHead>Employer/Broker</TableHead>
-                  <TableHead className="text-right">Rate / hr</TableHead>
                   <TableHead className="w-10 px-1"><span className="sr-only">Worker actions</span></TableHead>
                 </TableRow>
               </TableHeader>
@@ -266,9 +263,6 @@ export function EmployeesView({
                       </TableCell>
                     )}
                     <TableCell className="text-sm">{r.employerName || "Unassigned"}</TableCell>
-                    <TableCell className="text-right tabular-nums">
-                      {formatCurrency(r.ratePerHour)}
-                    </TableCell>
                     <TableCell className="w-10 px-1 text-right" onClick={event => event.stopPropagation()}>
                       <WorkerActions iconOnly worker={{ ...r, siteId: r.siteId ?? "" }} employers={employers}
                         history={assignments.filter(a => a.employee === r.id && a.site === r.siteId)} />
@@ -348,7 +342,6 @@ function exportCsv(rows: EmployeeRow[]) {
     "worker_type",
     "position",
     "project_code",
-    "rate_per_hour",
     "employer_broker",
   ];
   const lines = [headers.join(",")];
@@ -360,7 +353,6 @@ function exportCsv(rows: EmployeeRow[]) {
         r.workerType,
         csvCell(r.position),
         csvCell(r.projectCode),
-        r.ratePerHour.toFixed(2),
         csvCell(r.employerName || "Unassigned"),
       ].join(","),
     );

src/app/dashboard/workforce/workers/page.tsx

@@ -67,7 +67,6 @@ export default async function EmployeesPage({
     duplicateBadge: (badgeCounts.get(String(e.employee_no||"").trim().toUpperCase())||0)>1,
     position: e.position,
     workerType: e.worker_type,
-    ratePerHour: e.rate_per_hour || 0,
     projectCode: e.expand?.site?.project_code ?? siteById.get(e.site)?.project_code ?? "",
   }));