feat(vara-ui): upd inputs

[ereburg]

No description provided.

[nikitayutanov]

We can't put white background color as we can't guarantee that every application's background will be white too. It should be transparent.

[nikitayutanov]

disabled is applied from attrs destructuring already.

[nikitayutanov]

Another comments from previous PRs about UX and our style practices applies there too.

[nikitayutanov]

Also, regarding general approach to dark mode styles.

What do you think about creating mixin, that will abstract dark mode for a certain element?
I'm not sure that it will work, but something like:

@mixin darkMode ($width) {
  :global(.dark-mode) & {
    @content;
  }
}

to utilize it like that:

.element {
  color: #fff;

  @include darkMode {
    color: #000;
  }
}

If it's working as expected, I believe it would be far easier to control color variations in the scope of a certain element.
Input styles are bright example of it, since some properties can be easilly forgotten or missed.