ECHO-677 conversation header empty if name removed and title exists fix (#460)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Improved participant information display with fallback to title when
participant name is unavailable in project conversations.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: ussaama

echo/frontend/src/components/layout/ProjectConversationLayout.tsx

@@ -17,22 +17,20 @@ export const ProjectConversationLayout = () => {
 				},
 			},
 			fields: [
-				"id",
 				"participant_name",
+				"title",
 				"duration",
-				"is_finished",
-				"is_audio_processing_finished",
-				"created_at",
-				"updated_at",
-				{ chunks: ["source", "transcript"] },
+				"source",
+				{ chunks: ["source"] },
 			],
 		},
 	});
 
 	return (
 		<Stack className="relative px-2 py-4">
 			<Title order={1}>
-				{conversationQuery.data?.participant_name ?? "Conversation"}
+				{conversationQuery.data?.participant_name ||
+					conversationQuery.data?.title}
 			</Title>
 			{conversationQuery.data && (
 				<ConversationStatusIndicators