Unleashed.Chat v0.1.18

We gave the chat page a facelift and simplified the interface:

- New welcome screen for new chats.

- The chat history list no longer clutters the screen. To access it, click the History button.

Bugfixes:

- In some cases the loading spinner would spin forever when the model failed to respond (now you get an error message when that happens).

- When starting a new chat while a response is being generated, it no longer "spills over" to the new chat.