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* improvement(sidebar): memoize workflow/folder rows for faster tab navigation Switching between workspace tabs re-rendered every workflow and folder row in the sidebar because the rows (and the shared export hooks they call) subscribed to useParams, which re-renders on every navigation. - Wrap WorkflowItem and FolderItem in React.memo (the only un-memoized leaf rows; every sibling row was already memoized). - Decouple the rows from useParams: thread workspaceId as a stable prop from WorkflowList (matching the FileList convention), and expose the live active workflowId through a stable activeWorkflowIdRef on SidebarListContext, read only in delete callbacks — never during render. - Refactor the three shared export hooks (used only by these two rows) to take workspaceId as a param instead of calling useParams internally. - Stabilize handleWorkflowClick's identity via refs so the shared list context no longer changes identity on navigation. - Lazy-init the drag-drop siblings Map ref. On a tab switch only the two rows whose active state flips now re-render. * fix(sidebar): add workspaceId to render-callback deps renderWorkflowItem/renderFolderSection now pass workspaceId into the rows, so they must list it as a dependency — otherwise a workspace switch that doesn't also change workflowId would leave the callbacks closing over a stale workspaceId (wrong-workspace deletes/exports).