[Roadmap] Schema Explorer Enhancements

## Description

We envision a more capable and customizable Schema Explorer for understanding the shape of a graph.

## High-Level Plan

Potential scope:

- Persisted layout algorithm choice for the schema graph
- Auto-open details when selecting a node or edge
- Collapsible, persisted sidebar (width and active tab)
- Surface database-native data property types (e.g., `xsd:integer`) instead of JavaScript types

## Related Issues

- Original roadmap issue #685

## Disclaimer

This is a high level roadmap item. The details of the implementation and the described scope could change as the project evolves.

> [!IMPORTANT]
> Internal only — this issue is maintained by the core team and is not accepting external contributions.

The issue names no files, tests, or entry points. Start by reviewing the related roadmap issue #685 and confirming the core team's intended scope; the listed goals are persisted layout selection, node or edge detail behavior, a collapsible sidebar, and database-native property types, but no acceptance criteria define when the work is done.

Written by the indexing model from the issue text.