Can't remap Windows + C and other 'hard-coded' shortcuts

### Microsoft PowerToys version

0.99.1

### Installation method

WinGet

### Area(s) with issue?

Keyboard Manager

### Steps to reproduce

Add a remapping for Windows + C to anything else - I chose the App `C:\Windows\System32\calc.exe`.

Alternative: Remap Windows + Shift + Control + Alt + T to anything else.

### ✔️ Expected Behavior

Calculator to open.

### ❌ Actual Behavior

Instead it opens Settings --> Bluetooth & Devices --> Keyboard, scrolled to "Customise Copilot Key on keyboard".

Alternative: Opens Ms Teams.

### Upload Bug Report ZIP-file

_No response_

### Additional Information

Windows 11 25H2.

I want to be able to arbitrarility remap and disable hardcoded key binds.

### Other Software

_No response_

Start in the Keyboard Manager remapping entry point and reproduce the Windows + C and Windows + Shift + Control + Alt + T cases on Windows 11 25H2. Trace why the system shortcuts take precedence over the configured remap. Done means these hard-coded shortcuts can be remapped or disabled without opening Settings or Microsoft Teams.

Written by the indexing model from the issue text.