Fix: Make slider handle decimal values

[nikolajlauridsen]

Description

I'm a backend dev, likely, this solution is likely not optimal, feel free to make whatever change you see fit 😄

As reported over on the CMS tracker the sliders didn't handle decimal values umbraco/Umbraco-CMS#17546

This PR fixes this.

The fix is to "count" the amount of decimals in the step. I.E 0.1 has 1 decimal, 0.15 has 2, and then round the value to this amount of digits.

For the normal slider I round the numbers when they're generated, this is because in the render methods the step size is not available.

For the range slider the rounding happens in the render methods because the step size is available there.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

Motivation and context

It doesn't work, see the linked issue

How to test?

I've added 2 stories to test, if you add these before this change you see weird behaviour.

Screenshots (if appropriate)

See issue

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[nielslyngsoe]

@nikolajlauridsen love it, thanks!