FancyZones exclude by pressing shift during drag no longer working

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### Microsoft PowerToys version

v0.101.2362.0

### Installation method

Other (please specify in "Steps to Reproduce")

### Area(s) with issue?

FancyZones

### Steps to reproduce

Installation/Update via Patch my PC to v0.101.2362.0
Configure FancyZones zones, un-tick "hold shift to enable zones"
Start dragging a window (notepad.exe) you don't want to fill a zone without pressing shift
**While dragging** press shift and then let go of primary mouse button to set window down

### ✔️ Expected Behavior

Window does not get fit to zone.

### ❌ Actual Behavior

Window gets fit to zone even though it shouldn't.

### Upload Bug Report ZIP-file

_No response_

### Additional Information

If shift is pressed before starting to drag, FancyZones is working as intended and window is not fit to zone.
Issue not present in previous build.

System details:
Win11 26200.9106
.net 4.8.1 533509
German windows
System installation
run as user/autostart

### Other Software

_No response_

Start by reproducing the issue in FancyZones on Windows using the reported configuration: disable “hold shift to enable zones,” then press Shift while dragging. Trace FancyZones' drag and Shift-key handling; done means a window dragged without Shift initially is excluded from zones when Shift is pressed before release, while the existing behavior remains intact.

Written by the indexing model from the issue text.