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Brett Jephson
20f177b314
Tab slugs were always derived from the title, so a rename retargeted the tab's selection and broke every select button pointing at the old slug. The document schema now carries an optional `slug` per tab; resolve it ahead of the title. An absent slug still derives from the title, so published pages are unchanged and same-named tabs across a site keep selecting together with no authoring. Untitled tabs keep falling back to their stable id. `resolveSelectSlug` is duplicated from doc-core in the gitbook-x repo alongside `slugifySelectValue`, for the same reason: the editor preview and the published page have to resolve a tab to the same slug. Its test mirrors the editor's. `slug` is read structurally for now — it is in the document schema but reaches these types only once a new @gitbook/api is published, at which point the cast in Tabs.tsx can go. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>