🐛 Compact NavigationPane just with toggle button or padding

**Describe the bug**
First of all, NavigationPane has [toggleable] parameter but never used.
No combination of the current NavigationPane parameters will produce a compact pane that never opens and contains no toggle buttons or padding.

**To Reproduce**

**Expected behavior**
Setting the [toggleable] value to false should be enough to hide both the button and the padding.

Start at the NavigationPane entry point and inspect how its toggleable parameter is handled alongside the compact layout shown in the report. Reproduce the reported configuration, then verify that setting toggleable to false removes both the toggle button and the extra padding without changing other NavigationPane behavior.

Written by the indexing model from the issue text.