[UI] Fallback colors in themes don't work. Need to re-check generation of all CSS variables.

[VolhaBazhkova]

EPAM AI DIAL chat version

0.10.0

What happened?

In the tailwind.config we set css variables in this way var(--bg-layer-1, #090D13) to have a fallback value in case if no value received from the remote source. However, for now this doesn't work.
For example, if bg-layer-1 value at the themes config at remote source will be set to "", the fallback value #090D13 will be not used for the background.
UI looks broken.

Expected result
Fallback values should be working in case of the empty value from the remote source.

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[denys-kolomiitsev]

Looks like problem is in the styles.ts css variables functions.