There is no an option to set the STL export if you don't activate the Mesh WB

### Problem description

There is no a way to set the STL export deviation that wil result in the STL exeport tesselation tuning wihtout activating the MEsH WB, as the STL export is not stricly related to the Mesh WB as it could be performed for every Shape, the "Mesh Format" preference panel should be active without having the hassle to activate the Mesh WB.

### Workbench affected?

None

### Steps to reproduce

None

### Expected behavior

The "Mesh Format" panel in Import/Export setting should be active even if the Mesh WB is not activated, eventually Mesh WB specific settings could greyed or or hidden if Mesh Wb is not active.

### Actual behavior

No setting is show if Mesh Wb is not active.

### Development version About Info (in Safe Mode)

```shell
OS: Devuan GNU/Linux 6 (excalibur) (XFCE/xfce/xcb)
Architecture: x86_64
Version: 26.3.0dev.20260624 (Git shallow) AppImage
Build date: 2026/06/24 08:08:24
Build type: Release
Branch: (HEAD detached at e6a531c0a)
Hash: e6a531c0af11bc01d9d8aaa29ce70fa15622c3c5
Python 3.11.14, Qt 6.8.3, Coin 4.0.3, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3
shiboken 6.8.3, xerces-c 3.3.0, Clipper2 , IfcOpenShell 0.8.0, OCC 7.8.1
Locale: Italian/Italy (it_IT)
Stylesheet/Theme/QtStyle: FreeCAD.qss/FreeCAD Light/
Navigation Style/Orbit Style/Rotation Mode: CAD/Rounded Arcball/Window center
Logical DPI/Physical DPI/Pixel Ratio: 96/81.6656/1
```

### Last known good version (optional)

```shell

```

Start by locating the "Mesh Format" panel in the Import/Export preferences and the logic that controls its availability based on the Mesh workbench. Check how STL export deviation and Mesh workbench-specific settings are separated. Done means the panel is available without activating the Mesh workbench, with any workbench-only settings appropriately disabled or hidden.

Written by the indexing model from the issue text.