Aggregation UI: Add proper error UI
Created by: vovakulikov
Based on https://github.com/sourcegraph/sourcegraph/pull/40943 Part of https://github.com/sourcegraph/sourcegraph/issues/40766
Background
In this PR we added zero state (bars-like) background for search unavailable error. See tables below for different themes and UI modes
NOTE: Error message will be changed and fixed in a separate issue (@chwarwick FYI)
| Aggregation UI | Theme | Standard UI | Simple UI |
|---|---|---|---|
| Sidebar UI | Light theme |  |
 |
| Sidebar UI | Dark theme |  |
 |
| Full UI | Light theme |  |
 |
| Full UI | Dark theme |  |
 |
Test plan
- Make sure that error state has a proper zero state bars-like background in both themes and both UI modes (and in both Aggregation UI modes sidebar and full uI).
- @AlicjaSuska can you please take a look at colors of bars for this state? I changed them a little bit because I found that they look nice in design but in the browser they look vague and it makes harder to read the error text.
App preview:
Check out the client app preview documentation to learn more.