The various DevTools pages don't have a consistent height and text style

All of the pages aren't consistent when no information can be shown, examples:

- Inspector "No running apps" has a grey that isn't shared with others, also a larger font size?
- DeepLinks "Select a folder" text starts higher than other pages

Start by comparing the empty-state pages for Inspector and DeepLinks, focusing on their rendered height, text style, vertical position, and grey color. Done means the no-information views use consistent sizing, typography, positioning, and color across the examples described.

Written by the indexing model from the issue text.