Measurement values of network IO jump around when unit changes.

### What Happened?

I enabled the wingpanel integration and I like it a lot

But the values of the network IO shift the text / left when the values and/or value unit change.
This is extremely distracting

### Steps to Reproduce

Install monitor
enable wingpanel stats
do some work

### Expected Behavior

a monospace font should be used and there should be enough space reserved (and potentially filled with whitespace characters so that when I for example go from 10MBit/s to 100MBit/s bandwidth usage - the text does not jump

### OS Version

8.x (Circe)

### OS Architecture

amd64 (on most hardwares)

### Session Type

Secure Session (Wayland, This is the default)

### Software Version

Latest release (I have run all updates)

### Log Output

```shell

```

### Hardware Info

_No response_