[NumericInput]: read only and disabled states look identical

[NatalliaAlieva]

Description

The Numeric Input component currently displays the same visual appearance for both read only and disabled states when the input contains a value.

Steps to Reproduce

1. Open Numeric Input component.
2. Enter a numeric value into the input field in the "Basic" example.
3. Compare the visual appearance of isDisabled and isReadonly inputs.

Actual result

Both Readonly and Disabled inputs with values look identical, making it difficult to distinguish them.

Expected result

Read-only input: Text color remains normal, but editing is disabled.
Disabled input: Text color is greyed out, and editing is disabled.

Environment

• UUI version: 5.13.2
• Browser name: any
• Operating System: any