Add an empty state to the Messages panel

[brendanjones]

Problem Description

When viewing the messages panel after loading up a pilot (new pilot, or switching between pilots) then it will be blank. This could be confusing.

Related Issue Links

Can't find any.

Desired Solution

No specific solution desired, but potential solutions:

• Add something identifying the panel as the messages panel. Right now it's just one big grey slab.
• If the panel is empty of messages then add some placeholder text. Y'know, something like "Messages will be listed here once you have received some.".

Alternative Approaches

Open to suggestions.

Additional Context

This isn't particularly high prio for me - I don't use the messages panel much - but thought it worth noting when I noticed it.