Make left menu bar resizable

[mtrezza]

New Feature / Enhancement Checklist

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• Any contribution is under this license.
• Before posting search existing issues.

Current Limitation

The menu bar on the left side is not resizable. It uses ~20% of the total dashboard screen estate. While it's possible to fold it in by clicking on the pin icon, it's impractical when navigating a lot between classes.

The other issue is that long class names are truncated, because the bar has a fixed size.

Feature / Enhancement Description

• Make the bar width resizable, so that it can be adapted according to class names and reduced in size for easy navigation while not taking as much screen space.
• Remove the "Create a class" button from the "Browser" menu to allow resizing the bar to a smaller size; adding a class is usually not a frequent action and it can be done via the "Edit" menu.

[parse-github-assistant[bot]]

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