feat(worker): poll + reconcile stopwatch to server (admin stop/cancel)

apps/worker/src/api/sessions.ts

@@ -13,6 +13,8 @@ export function useActiveSessions() {
   return useQuery({
     queryKey: ['sessions', 'active'],
     queryFn: () => apiFetch<WorkSession[]>('/api/sessions/active'),
+    // Poll so the stopwatch converges to admin changes (stop/cancel) within ~15s.
+    refetchInterval: 15000,
   });
 }
 

apps/worker/src/screens/Stopwatch.test.tsx

@@ -4,6 +4,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import type { Activity, WorkSession } from '@solelog/shared';
 import Stopwatch from './Stopwatch';
+import { ApiError } from '../lib/api';
 import { useActivities } from '../api/activities';
 import {
   useActiveSessions,
@@ -247,4 +248,52 @@ describe('Stopwatch', () => {
 
     expect(await screen.findByText('Gepauzeerd — tik om te hervatten')).toBeInTheDocument();
   });
+
+  it('resets and shows a notice when the running session is stopped by the admin', async () => {
+    // Start with the session present so the screen adopts the running state.
+    mockedUseActiveSessions.mockReturnValue(
+      query<ReturnType<typeof useActiveSessions>>([activeSession()]),
+    );
+    const { rerender } = renderStopwatch();
+
+    // Confirm we are running (the Stop & Opslaan button is shown).
+    await screen.findByRole('button', { name: 'Stop & Opslaan' });
+
+    // The admin stops the session: the active list now no longer contains it.
+    mockedUseActiveSessions.mockReturnValue(query<ReturnType<typeof useActiveSessions>>([]));
+    const queryClient = new QueryClient({ defaultOptions: { queries: { retry: false } } });
+    rerender(
+      <QueryClientProvider client={queryClient}>
+        <Stopwatch />
+      </QueryClientProvider>,
+    );
+
+    // The stopwatch resets to idle and shows the admin-stopped notice.
+    expect(
+      await screen.findByText('Deze sessie is door de beheerder gestopt.'),
+    ).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'Start Stopwatch' })).toBeInTheDocument();
+    expect(screen.queryByRole('button', { name: 'Stop & Opslaan' })).not.toBeInTheDocument();
+  });
+
+  it('resets locally when stop fails with a 409 (already closed)', async () => {
+    const user = userEvent.setup();
+    stopMutate.mockImplementation((_id: number, opts?: { onError?: (e: unknown) => void }) => {
+      opts?.onError?.(new ApiError(409, 'Conflict'));
+    });
+    mockedUseActiveSessions.mockReturnValue(
+      query<ReturnType<typeof useActiveSessions>>([activeSession()]),
+    );
+    renderStopwatch();
+
+    const stopBtn = await screen.findByRole('button', { name: 'Stop & Opslaan' });
+    await user.click(stopBtn);
+
+    expect(stopMutate).toHaveBeenCalledTimes(1);
+    // The timer resets to idle despite the 409 (no stuck running state).
+    await waitFor(() =>
+      expect(screen.getByRole('button', { name: 'Start Stopwatch' })).toBeInTheDocument(),
+    );
+    expect(screen.queryByRole('button', { name: 'Stop & Opslaan' })).not.toBeInTheDocument();
+  });
 });

apps/worker/src/screens/Stopwatch.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useRef, useState } from 'react';
 import type { InsoleType, WorkSession } from '@solelog/shared';
+import { ApiError } from '../lib/api';
 import { useActivities } from '../api/activities';
 import {
   useActiveSessions,
@@ -44,13 +45,26 @@ export default function Stopwatch() {
   const [discardPending, setDiscardPending] = useState(false);
   const discardTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
 
+  // Transient notice when the admin stopped/cancelled this session out from under us.
+  const [stoppedByAdmin, setStoppedByAdmin] = useState(false);
+
   const isRunning = sessionId !== null;
 
-  // Recover an active session on load (phone-died / resume-elsewhere path).
+  // Reconcile against server truth on every active-sessions poll:
+  // - running locally but our session is gone from the active list → admin stopped/cancelled it.
+  // - idle but the server has an active session → adopt it (phone-died / resume-elsewhere path).
   useEffect(() => {
-    if (isRunning) return;
     const active = activeSessionsQuery.data;
-    if (!active || active.length === 0) return;
+    if (!active) return;
+    if (isRunning) {
+      const stillActive = active.some((s) => s.id === sessionId);
+      if (!stillActive) {
+        resetTimer();
+        setStoppedByAdmin(true);
+      }
+      return;
+    }
+    if (active.length === 0) return;
     const session: WorkSession = active[0];
     setSessionId(session.id);
     setStartMs(new Date(session.start_time).getTime());
@@ -107,6 +121,7 @@ export default function Stopwatch() {
 
   function handleStart() {
     if (!canStart || activeActivityId === null) return;
+    setStoppedByAdmin(false); // clear any prior admin-stopped notice
     startSession.mutate(
       { activity_id: activeActivityId, insole_type: insoleType, pair_count: pairCount },
       {
@@ -155,10 +170,16 @@ export default function Stopwatch() {
     }
   }
 
+  // A 409 means the session is already closed server-side (e.g. admin stopped it) —
+  // reset locally instead of leaving the timer stuck.
+  function resetIfConflict(error: unknown) {
+    if (error instanceof ApiError && error.status === 409) resetTimer();
+  }
+
   function handleStop() {
     if (sessionId === null) return;
     const id = sessionId;
-    stopSession.mutate(id, { onSuccess: () => resetTimer() });
+    stopSession.mutate(id, { onSuccess: () => resetTimer(), onError: resetIfConflict });
     // Selections (zool/handling/count) persist for the next session.
   }
 
@@ -177,7 +198,7 @@ export default function Stopwatch() {
       discardTimerRef.current = null;
     }
     const id = sessionId;
-    discardSession.mutate(id, { onSuccess: () => resetTimer() });
+    discardSession.mutate(id, { onSuccess: () => resetTimer(), onError: resetIfConflict });
   }
 
   const statusPill = !isRunning
@@ -192,6 +213,24 @@ export default function Stopwatch() {
     <div className="screen">
       <h1 className="screen-title">Stopwatch</h1>
 
+      {stoppedByAdmin && !isRunning && (
+        <div
+          role="status"
+          style={{
+            marginBottom: 20,
+            padding: '12px 16px',
+            borderRadius: 12,
+            border: '1px solid #FDE68A',
+            background: '#FEF3C7',
+            color: '#92400E',
+            fontSize: 14,
+            fontWeight: 600,
+          }}
+        >
+          Deze sessie is door de beheerder gestopt.
+        </div>
+      )}
+
       {/* Section 1 — Type zool */}
       <h2 className="section-label">Type zool</h2>
       <div className="segmented" style={{ display: 'flex', gap: 8, marginBottom: 20 }}>