fix(ui): restore issue detail sidebar import

ui/src/pages/IssueDetail.tsx

@@ -13,6 +13,7 @@ import { projectsApi } from "../api/projects";
 import { useCompany } from "../context/CompanyContext";
 import { useDialog } from "../context/DialogContext";
 import { usePanel } from "../context/PanelContext";
+import { useSidebar } from "../context/SidebarContext";
 import { useToastActions } from "../context/ToastContext";
 import { useBreadcrumbs } from "../context/BreadcrumbContext";
 import { assigneeValueFromSelection, suggestedCommentAssigneeValue } from "../lib/assignees";