fix: Fix rendering bug in Conversation.tsx by replacing forEach with map

[chenura999]

Summary

Fixes a critical bug in Conversation.tsx where chat messages were failing to render.

Problem

The message list was being iterated using .forEach(), which returns undefined and produces no output in the JSX. This caused the chat interface to appear empty even when messages existed in the state.

Solution

Replaced .forEach() with .map() to correctly return an array of <Message /> components for rendering.

Testing

• Verified that the syntax now correctly constructs a list of React/Valdi elements.
• Confirmed that map is the standard and correct patterns for list rendering in this context.