KCard: Update spaces to the latest designs

[MisRob]

Summary

Update spaces between card's content and its border to the latest designs.

References

This need is motivated by new additions to the cards family in Kolibri, such as

• Resource discovery: Implement folder card kolibri#12318
• Resource discovery: Implement channel card kolibri#12317
• Resource discovery: Implement resource card kolibri#12319

Current behavior

When developing the first version of KCard, we worked with WIP designs and frequently used 12px for paddings and margins, for example here

Expected behavior

Now when we're building first few production cards, let's align KCard to the final designs. It seems that most frequently, there's 24px top/right/bottom/left space between content and card's border, so let's use this value for default KCard behavior.

Out of scope

Rarely, there are exceptions, such as here 16px space at the bottom.

There's no need to be worried about it in the scope of this issue. This task is only about using the most common value as default. We can clarify deviations with the design team as we're building the productions cards and either update designs or add some options to configure KCard from outside.

Acceptance criteria

• All layouts are updated (for consistency)
• No regressions in any of the layouts

[MisRob]

Closed by #709