Feature request: Report Tip position before exporting the model.

### Problem description

When editing a model, it is often necessary to change the position of the tip in the feature tree.
Especially in models with multiple bodies, the tip setting for the last feature is lost. At least, I regularly forget to do this.

It would be helpful if the tip position were automatically checked when the user
saves the model or exports it to STEP or another format.
Either a short note could be displayed, or the tip could be automatically set to the last feature.

### Workbench affected?

None

### Steps to reproduce

feature request.

### Expected behavior

feature request.

### Actual behavior

feature request.

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

```shell
OS: Windows 11 build 22631
Architecture: x86_64
Version: 1.1.0rc2.20260108 (Git shallow)
Build date: 2026/01/08 12:03:27
Build type: Release
Branch: (HEAD detached at 0c7935c)
Hash: 0c7935c755bd9531f7061be31fab8788742a44b7
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, IfcOpenShell 0.8.4, OCC 7.8.1
Locale: German/Germany (de_DE)
Navigation Style/Orbit Style/Rotation Mode: TinkerCAD/Trackball/Drag at cursor
Stylesheet/Theme/QtStyle: FreeCAD.qss/FreeCAD Light/
Logical DPI/Physical DPI/Pixel Ratio: 96/94.1104/1
Installed mods:
* AddonManager 2025.7.17
* Curves 0.6.64
* fasteners 0.5.43
```

### Last known good version (optional)

```shell

```