Frontend Component-Level Refactors

[DXCanas]

Using a clearly defined local state in the child components. Tightening up CSS scoping. Defining options objects for complex properties. Adjusting render functions to make them more legible. etc.

Split from
#175 (reply in thread)

[DXCanas]

Let's use more of these, too:
#176 (comment)

[DXCanas]

Hard to follow some styles, as they live up or down the tree:

• Tile styles living in parent
  Settings and Actions Toolbar #170 (comment)

• Parent element of element in slot determined by parent, which just gets confusing.