Saved queries have no user-defined name, making them hard to distinguish

## Problem
Saved queries are stored and listed with no user-defined name — only the raw SQL text is shown. As the number of saved queries grows, it becomes impossible to distinguish them at a glance.

## Current behaviour
The saved queries panel shows each entry as its raw SQL:
```
SELECT * FROM `customers` LIMIT 100;
demo · 2d ago
```

## Expected behaviour
Users should be able to give a saved query a human-readable name (e.g., "Monthly active users", "Revenue report"). The name should appear prominently, with the SQL shown as a secondary detail.

The edit (pencil) icon is already present on each saved query item — it could open a rename/edit flow.

## Additional context
This is a common pattern in tools like TablePlus, DataGrip, and Postico where saved queries are labelled for quick identification.