feat(worker): server-authoritative Stopwatch screen with active-session recovery

apps/worker/src/api/sessions.ts

@@ -0,0 +1,46 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import type { StartSessionInput, WorkSession } from '@solelog/shared';
+import { apiFetch } from '../lib/api';
+
+export function useActiveSessions() {
+  return useQuery({
+    queryKey: ['sessions', 'active'],
+    queryFn: () => apiFetch<WorkSession[]>('/api/sessions/active'),
+  });
+}
+
+export function useStartSession() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (input: StartSessionInput) =>
+      apiFetch<WorkSession>('/api/sessions/start', {
+        method: 'POST',
+        body: JSON.stringify(input),
+      }),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['sessions'] });
+    },
+  });
+}
+
+export function useStopSession() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (id: number) =>
+      apiFetch<WorkSession>(`/api/sessions/${id}/stop`, { method: 'POST' }),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['sessions'] });
+    },
+  });
+}
+
+export function useDiscardSession() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (id: number) =>
+      apiFetch<WorkSession>(`/api/sessions/${id}/discard`, { method: 'POST' }),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['sessions'] });
+    },
+  });
+}