Function apply_tabs_reordered_bulk 

fn apply_tabs_reordered_bulk(
    wstore: &WaveStore,
    workspace_id: &str,
    tab_ids: &[String],
) -> Result<(), Box<dyn Error>>

Phase E.5.3 — replace the workspace’s tabids with the new list and drain any legacy pinnedtabids rows. Pinning was a Waveterm feature removed from AgentMux; bootstrap merges legacy pinned tabs into the reducer’s tab_ids, so the next reorder is the canonical full ordering. Leaving stale pinnedtabids in SQLite would cause UI double-insertion (workspace.tsx builds the displayed tab list as [...pinnedtabids, ...tabids]).