fix: code review cleanup

- Fixed TypeScript exactOptionalPropertyTypes errors in chat components
- Removed console.error statements (errors are handled via state)
- Fixed type compatibility issues with undefined vs null values
- All chat-related files now pass strict TypeScript checks

apps/web/src/lib/api/ideas.ts

@@ -141,7 +141,7 @@ export async function createConversation(
   return createIdea({
     title,
     content,
-    projectId,
+    ...(projectId !== undefined && { projectId }),
     category: "conversation",
     tags: ["chat"],
     metadata: { conversationType: "chat" },
@@ -156,5 +156,8 @@ export async function updateConversation(
   content: string,
   title?: string
 ): Promise<Idea> {
-  return updateIdea(id, { content, title });
+  return updateIdea(id, { 
+    content, 
+    ...(title !== undefined && { title })
+  });
 }