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## Summary by CodeRabbit
* **Refactor**
* Collapsible section state in navigation panels is now managed using a
unified path-based approach, enabling more consistent and centralized
control across desktop and mobile interfaces.
* The collapsed/expanded state of navigation sections and nodes is now
persistently tracked using hierarchical paths, improving reliability
across sessions and devices.
* Internal state management is streamlined, with local state replaced by
a shared service, resulting in more predictable navigation behavior.
* **Chores**
* Removed obsolete types and legacy section management logic for
improved maintainability.
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