Core: no way to reassign the rename(f2) shortcut

### Problem description

you cant reassign the "rename" shortcut. on my laptop, using `fn + f2` to use `f2` is inconvenient. i dont know if there are other function keys that cant be reassigned.

### Workbench affected?

Core (App, Gui,...)

### Steps to reproduce

1. open freecad
2. go to preferences -> keyboard
3. in the shortcuts field type "rename"

### Expected behavior

the rename shortcut should populate and allow you to reassign it.

### Actual behavior

nothing is populated in the filter or priority list.

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

```shell
OS: Fedora Linux 44 (KDE Plasma Desktop Edition) (KDE//usr/share/wayland-sessions/plasma.desktop/wayland)
Architecture: x86_64
Version: 26.3.0dev.20260819 (Git shallow) AppImage
Build date: 2026/08/19 23:20:55
Build type: Release
Branch: (HEAD detached at 2bb00c918)
Hash: 2bb00c91865d376c4ab0441a3a887b4f2d0a3090
Python 3.11.14, Qt 6.8.3, Coin 4.0.10 (bundled), Pivy 0.6.11 (bundled), 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: English/United States (en_US)
Stylesheet/Theme/QtStyle: FreeCAD.qss/FreeCAD Dark/
QPA/File dialog/Color dialog: xcb/via Qt/via Qt
Navigation Style/Orbit Style/Rotation Mode: CAD/Rounded Arcball/Window center
Logical DPI/Physical DPI/Pixel Ratio: 96/162.074/1
OpenGL version/vendor/renderer: 4.6 (Compatibility Profile) Mesa 26.1.7/Intel/Mesa Intel(R) Iris(R) Xe Graphics (RPL-U)
```

### Last known good version (optional)

```shell

```

Start in FreeCAD's Preferences → Keyboard shortcut field and reproduce the missing “rename” entry described in the issue. Trace how the rename command registers its shortcut and compare it with commands that populate the filter; done means the rename shortcut appears and can be reassigned.

Written by the indexing model from the issue text.