markdown support for talk messages

lib/api/demo/data/demo_talk.dart

@@ -324,6 +324,22 @@ class DemoTalk {
         message: 'Gute Idee, ich sammle schon mal Vorschläge.',
         reactions: {'👍': 3},
       ),
+      _msg(
+        id: base + 4,
+        token: token,
+        actor: 'ben',
+        display: 'Ben',
+        ago: const Duration(hours: 2),
+        message:
+            '## Ablauf Sommerfest\n'
+            'Ein paar **Punkte** für Mittwoch:\n\n'
+            '- Stände aufbauen ab *14 Uhr*\n'
+            '- [x] Getränke bestellt\n'
+            '- [ ] Musik organisieren\n\n'
+            '> Bitte bringt Ideen mit!\n\n'
+            'Mehr Infos auf der [SV-Seite](https://marianum-fulda.de).',
+        markdown: true,
+      ),
     ];
   }
 
@@ -346,6 +362,7 @@ class DemoTalk {
     required Duration ago,
     required String message,
     Map<String, int>? reactions,
+    bool markdown = false,
   }) => _msg(
     id: id,
     token: token,
@@ -354,6 +371,7 @@ class DemoTalk {
     ago: ago,
     message: message,
     reactions: reactions,
+    markdown: markdown,
   );
 
   static GetChatResponseObject _msg({
@@ -364,6 +382,7 @@ class DemoTalk {
     required Duration ago,
     required String message,
     Map<String, int>? reactions,
+    bool markdown = false,
   }) => GetChatResponseObject(
     id,
     token,
@@ -380,6 +399,7 @@ class DemoTalk {
     reactions,
     null,
     null,
+    markdown,
   );
 
   static GetRoomResponseObject _room({

lib/api/marianumcloud/talk/chat/get_chat_response.dart

@@ -42,6 +42,11 @@ class GetChatResponseObject {
   Map<String, RichObjectString>? messageParameters;
   GetChatResponseObject? parent;
 
+  /// Whether the server flagged this message to be rendered as Markdown
+  /// (capability `markdown-messages`). Absent on older servers/messages, in
+  /// which case it stays `false` and the body renders as plain text.
+  bool markdown;
+
   GetChatResponseObject(
     this.id,
     this.token,
@@ -57,8 +62,9 @@ class GetChatResponseObject {
     this.messageParameters,
     this.reactions,
     this.reactionsSelf,
-    this.parent,
-  );
+    this.parent, [
+    this.markdown = false,
+  ]);
 
   factory GetChatResponseObject.fromJson(Map<String, dynamic> json) =>
       _$GetChatResponseObjectFromJson(json);

lib/api/marianumcloud/talk/chat/get_chat_response.g.dart

@@ -49,6 +49,7 @@ GetChatResponseObject _$GetChatResponseObjectFromJson(
   json['parent'] == null
       ? null
       : GetChatResponseObject.fromJson(json['parent'] as Map<String, dynamic>),
+  json['markdown'] as bool? ?? false,
 );
 
 Map<String, dynamic> _$GetChatResponseObjectToJson(
@@ -73,6 +74,7 @@ Map<String, dynamic> _$GetChatResponseObjectToJson(
     (k, e) => MapEntry(k, e.toJson()),
   ),
   'parent': instance.parent?.toJson(),
+  'markdown': instance.markdown,
 };
 
 const _$GetRoomResponseObjectMessageActorTypeEnumMap = {