Make travel app suitable for a polished demo to customers

[jacobsimionato]

Smaller quality to solve:

• UI interaction events cluttering up travel app conversation: UI interaction events cluttering up travel app conversation #230
• Images not appearing reliably
• Optional images look weird
• Sometimes items get repeated in the conversation, e.g. multiple copies of chips

Larger issues

• Lack of ability for the agent to sense what stage of planning the user is in and react to it, e.g. by starting off with overall ideas, then zooming into specific searches.

[jacobsimionato]

#268 helped with this