Treat email and news posts as distinct types on the frontend and backend

server/src/nm.rs

@@ -15,7 +15,7 @@ use crate::{
     error::ServerError,
     graphql::{
         Attachment, Body, DispositionType, Email, EmailThread, Header, Html, Message, PlainText,
-        Tag, ThreadSummary, UnhandledContentType,
+        Tag, Thread, ThreadSummary, UnhandledContentType,
     },
     linkify_html, sanitize_html,
 };
@@ -125,7 +125,7 @@ pub async fn thread(
     nm: &Notmuch,
     thread_id: String,
     debug_content_tree: bool,
-) -> Result<EmailThread, ServerError> {
+) -> Result<Thread, ServerError> {
     // TODO(wathiede): normalize all email addresses through an address book with preferred
     // display names (that default to the most commonly seen name).
     let mut messages = Vec::new();
@@ -246,11 +246,11 @@ pub async fn thread(
         .next()
         .and_then(|m| m.subject.clone())
         .unwrap_or("(NO SUBJECT)".to_string());
-    Ok(EmailThread {
+    Ok(Thread::Email(EmailThread {
         thread_id,
         subject,
         messages,
-    })
+    }))
 }
 
 fn email_addresses(