Improvement: Make empty-report chat input copy dynamic and action-oriented (ConciAI)

[MelvinBot]

Problem

When a member lands on an empty report, the chat input shows copy that adds confusion rather than helping. Two things are off:

1. The copy is static and doesn't reference the primary action we actually want the member to take on that report.
2. There's no signal that the input is talking to ConciAI/Concierge — nothing tells the member that typing here will actually get Concierge to do something.

This is a follow-up (v2) to the earlier improvement that replaced the uninspiring "Write something…" placeholder with a few rotating phrases.

Solution

Make the chat-input copy dynamic so it surfaces when applicable and matches the primary action for that report — and phrase it as an action Concierge can perform, so the member learns the chat/ConciAI can actually do things.

• Instead of a passive prompt like "How do I add an expense?" (which just creates more work for the member), surface an action-oriented hint like "Try: Add an expense" on an empty report where adding an expense is the primary action.
• Keep it contextual: only surface the hint when it's applicable, and match it to the primary action we want the member to take on that specific report.

The goal is that the copy both (a) reduces confusion on empty reports and (b) makes it clear the member is asking Concierge to take an action.