use default profile image if its not current user

Walkthrough

The changes enhance the UserMessage and UserPortrait components to better handle and display user-specific information. By introducing a for prop in UserPortrait, it allows distinct user icons to be shown based on context, improving user recognition in shared chat scenarios. This modification aligns with the need for accurate representation of users in shared chats.

Changes

Files	Change Summary
`src/components/chat/userMessage.tsx`	Added a `for` prop to `UserPortrait`, enabling it to receive a `user` object for enhanced user representation.
`src/components/chat/userPortrait.tsx`	Introduced `UserPortraitProps` interface with an optional `for` property; updated user image logic to conditionally display user images.

Assessment against linked issues

Objective	Addressed	Explanation
Show proper icon when chat shared (#65)	✅

🐇 In the meadow, hops a rabbit bright,
With user portraits now shining with light.
Sharing chats with icons that gleam,
A happier world, like a wondrous dream!
Hooray for changes, let’s give a cheer,
For every user's face, now shown clear! ✨

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ucdavis / PolicyWonk