Addon manager minimize and maximize buttons

### Problem description

It takes me a while to make the addon manager window big by dragging to resize it so I can look at more addons at the same time.

### Workbench affected?

Other (specify in description)

### Steps to reproduce

1. Open addon manager

### Expected behavior

I suggest adding a minimize and maximize button to the window next to the 'X' button. That would be great :)
It would also be cool if the shortcut WIN + Up arrow key would maximize the window, I tend to use that shortcut to maximize windows.

### Actual behavior

Must resize window by dragging the corner or sides of window (which is good that is possible)

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

```shell
Here is my freecad info:
OS: Windows 10 build 19045
Architecture: x86_64
Version: 1.1.0.20260325 (Git shallow)
Build date: 2026/03/25 02:17:53
Build type: Release
Branch: (HEAD detached at 34a971666)
Hash: 34a9716668b1ddeb55b914f1c5be644826bdbbbf
Python 3.11.15, 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: English/Sweden (en_SE)
Navigation Style/Orbit Style/Rotation Mode: SolidWorks/Trackball/Drag at cursor
Stylesheet/Theme/QtStyle: unset/FreeCAD Classic/
Logical DPI/Physical DPI/Pixel Ratio: 96/94.0197/1
Installed mods:
* Assembly4 0.50.7
* Manipulator 1.5.7
* Render 2024.1.23
```

### Last known good version (optional)

```shell

```