[FEATURE] allow adjusting font size of text displayed in bar

[hachimagi]

Submission checklist

• I have searched existing issues and confirmed this has not been requested before.
• I have checked existing pull requests for similar changes.

Feature type

Configuration / customization

Feature summary

Add a "font scale" option for text that appears in bar widgets, separate from the scale of the widgets themselves.

Motivation / use case

I like how big the other elements are but the text feels too small.
v4 had it.

Proposed solution

Add an option to bar settings.

Alternatives considered

No response

References / related projects

No response

Additional context

No response