Rework ranked play chat to reduce overall area

[smoogipoo]

In discussions, we've come to the conclusion to attempt to use a chat-bubble system to minimise the effective area of the chat. In particular, the results screen doesn't give us enough space to display the full chat box without overlapping the main screen content.

This PR both adds the chat to the results screen, and reworks it to use such a bubble system (not sure what to call it, IM style?).

2026-03-25.18-10-10.mp4

• New messages are previewed for 3 seconds.
• When focusing and unfocusing the textbox, the history moves into expanded state (show the most recent 10 messages) or collapsed state (fade messages out ASAP).

This is a bit of an initial implementation to get a feel of how it behaves, and there's more that can be done such as adding colours, improving the transforms, perhaps adding it to the intro screen (post-animation) but the structure's a bit weird atm.