Persist issue read state and clear unread on open

ui/src/api/issues.ts

@@ -32,6 +32,7 @@ export const issuesApi = {
     api.post<IssueLabel>(`/companies/${companyId}/labels`, data),
   deleteLabel: (id: string) => api.delete<IssueLabel>(`/labels/${id}`),
   get: (id: string) => api.get<Issue>(`/issues/${id}`),
+  markRead: (id: string) => api.post<{ id: string; lastReadAt: Date }>(`/issues/${id}/read`, {}),
   create: (companyId: string, data: Record<string, unknown>) =>
     api.post<Issue>(`/companies/${companyId}/issues`, data),
   update: (id: string, data: Record<string, unknown>) => api.patch<Issue>(`/issues/${id}`, data),