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Joshen Lim ad30c04e0e Persist last visited explorer tab (#50557)
## Context

Saves the last visited explorer tab via `useDashboardHistory`, such that
landing back on `/explorer` will open the last visited page. Similar
behaviour to Table Editor and SQL Editor

Would also be useful when going between the SQL Editor and Explorer to
bring snippets over

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Explorer now remembers and restores the last visited query, chat, or
notebook tab.
* Automatically returns to the Explorer home screen when a saved tab is
unavailable.
* Displays a loading state while the last visited tab is being restored.

* **Bug Fixes**
  * Closing deleted chat tabs now clears their saved history.

* **Tests**
* Added coverage for Explorer tab restoration, loading states, and stale
history cleanup.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2026-09-21 16:34:50 +08:00
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