web: show message-ID when viewing thread

web/graphql/schema.json

@@ -207,6 +207,22 @@
           "description": null,
           "enumValues": null,
           "fields": [
+            {
+              "args": [],
+              "deprecationReason": null,
+              "description": null,
+              "isDeprecated": false,
+              "name": "id",
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "String",
+                  "ofType": null
+                }
+              }
+            },
             {
               "args": [],
               "deprecationReason": null,

web/graphql/show_thread.graphql

@@ -2,6 +2,7 @@ query ShowThreadQuery($threadId: String!) {
   thread(threadId: $threadId) {
     subject
     messages {
+      id
       subject
       from {
         name

web/src/view/mod.rs

@@ -263,6 +263,7 @@ fn view_thread(thread: &ShowThreadQueryThread) -> Node<Msg> {
                 .map(|from| div![C!["header"], "From: ", view_address(&from)]),
             msg.timestamp
                 .map(|ts| div![C!["header"], "Date: ", human_age(ts)]),
+            div!["Message-ID: ", &msg.id],
             div![
                 C!["header"],
                 IF!(!msg.to.is_empty() => span!["To: ", view_addresses(&msg.to)]),