refactor: remove unused llmModels prop from Conversation

The llmModels prop was no longer used after removing the
llmModelDisplayName and coderLlmModelDisplayName memoized values.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: tahierhussain

frontend/src/ide/chat-ai/Conversation.jsx

@@ -15,7 +15,6 @@ const Conversation = memo(function Conversation({
   savePrompt,
   message,
   chatIntents,
-  llmModels,
   isPromptRunning,
   isLastConversation,
   selectedChatId,
@@ -181,7 +180,6 @@ Conversation.propTypes = {
   savePrompt: PropTypes.func.isRequired,
   message: PropTypes.object.isRequired,
   chatIntents: PropTypes.array.isRequired,
-  llmModels: PropTypes.array.isRequired,
   isPromptRunning: PropTypes.bool.isRequired,
   isLastConversation: PropTypes.bool.isRequired,
   selectedChatId: PropTypes.string.isRequired,