Sorry for creating this kitchen sink issue... 😢

A few UX issues in the current Call Stack view:

• It's hard to differentiate between launch targets and stack frames, since both render with exactly the same font family and style and they all have a grey label on the right hand side. We can maybe explore different font styles and/or icons.
• It's hard to understand that Load More Stack Frames is an action. We should definitely not use a row's click handler for representing this action. We should instead drop the row click handler and simply render a clickable button in that row, a la Explorer's Open Folder button.
• The async separators should not take the same height as a regular row. They can be much shorter and draw a separator much like what @: does in Quick Outline.

cc @misolori