fix: use variables for button and label components

[qradle-yndx]

Summary by Sourcery

Use shared SCSS variables for component heights across button and label size variants.

Enhancements:

• Replace hardcoded height values in button and label size modifiers with shared SCSS height variables to centralize sizing tokens.
• Introduce a new $xxs-height variable for the smallest label size to align it with the shared sizing system.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR replaces hardcoded pixel heights in Button and Label size modifiers with shared SCSS variables defined in variables.scss, aligning component sizing with the design token system.

File-Level Changes

Change	Details	Files
Use shared height tokens for Button size variants instead of hardcoded pixel values.	Replaced hardcoded --_--height values for xs, s, m, l, xl Button size modifiers with interpolated SCSS variables Kept existing border-radius, padding, and icon-space CSS custom properties unchanged for each size	src/components/Button/Button.scss
Use shared height tokens for Label size variants instead of hardcoded pixel values.	Replaced hardcoded --_--height values for xxs, xs, s, m Label size modifiers with interpolated SCSS variables Retained existing border-radius and margin-related CSS custom properties for each Label size	src/components/Label/Label.scss
Define shared height SCSS variables for use by Button and Label components.	Added $xxs-height variable for 18px height to support Label xxs size Ensured existing size variables ($xs-height, $s-height, $m-height, etc.) are available for component usage	src/components/variables.scss

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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