Describe the bug

Trying to enter a ui_scale below 1.0 lead the user to type '0' or '.' which tooll will interpret as 0 and entirely break its UI doing so.

Please complete the following information):

• OS: windows11 (should affect all systems)
• Graphics card and resolution: irrelevant

To Reproduce

1. go to settings > interface > ui scale
2. Select the field, start typing "0.75" or ".75"
3. Tooll breaks upon the 1st character, won't accept more input, and the ui scale-out beyond anything visible.

Expected behavior

Tooll should let the user type the value they intend and parse it correctly.

Additional context

#340 fixes this