BUG: calculator misbehaving, adding extra digits

### Checks

- [x] I have checked that this issue has not already been reported.

- [x] I am using the latest version of Flow Launcher.

- [ ] I am using the prerelease version of Flow Launcher.

### Problem Description

Substract two numbers 3000000-2911111,82
Expected result: 88888,18
Actual result:

### To Reproduce

Substract two numbers

### Screenshots

_No response_

### Flow Launcher Version

2.1.3

### Windows Build Number

Version 10.0.26100 Build 26100

### Error Log

```shell

Replace this line with the important log contents.

```

Start by reproducing the calculator issue in Flow Launcher 2.1.3 on Windows with the expression 3000000-2911111,82, then inspect the calculator entry point and how it parses decimal commas and subtraction. Done means the expression returns the expected result, 88888,18, without extra digits or a blank output.

Written by the indexing model from the issue text.