simplified code across the app and consolidated duplicated helpers

lib/view/pages/talk/data/chat_message.dart

@@ -11,27 +11,33 @@ import '../widgets/highlighted_linkify.dart';
 import '../widgets/message_markdown.dart';
 
 class ChatMessage {
-  String originalMessage;
-  Map<String, RichObjectString>? originalData;
+  final String originalMessage;
+  final Map<String, RichObjectString>? originalData;
 
-  RichObjectString? file;
-  String content = '';
+  final RichObjectString? file;
+  final String content;
 
-  ChatMessage({required this.originalMessage, this.originalData}) {
-    if (originalData?.containsKey('file') ?? false) {
-      file = originalData?['file'];
-    }
-    content = RichObjectStringProcessor.parseToString(
-      originalMessage,
-      originalData,
-    );
-  }
+  ChatMessage({required this.originalMessage, this.originalData})
+    : file = originalData?['file'],
+      content = RichObjectStringProcessor.parseToString(
+        originalMessage,
+        originalData,
+      );
 
   Widget getWidget({
     String? highlightQuery,
     TextStyle? style,
     bool renderMarkdown = false,
   }) {
+    final poll = originalData?['object'];
+    if (poll?.type == RichObjectStringObjectType.talkPoll) {
+      return ListTile(
+        leading: const Icon(Icons.poll_outlined),
+        title: Text(poll!.name),
+        contentPadding: const EdgeInsets.only(left: 10),
+      );
+    }
+
     final emojiFontSize = standaloneEmojiFontSize(content);
     final effectiveStyle = emojiFontSize == null
         ? style
@@ -64,14 +70,7 @@ class ChatMessage {
       );
     }
 
-    if (originalData?['object']?.type == RichObjectStringObjectType.talkPoll) {
-      return ListTile(
-        leading: const Icon(Icons.poll_outlined),
-        title: Text(originalData!['object']!.name),
-        contentPadding: const EdgeInsets.only(left: 10),
-      );
-    }
-
+    final file = this.file;
     if (file == null) return contentWidget;
 
     return Padding(
@@ -88,7 +87,7 @@ class ChatMessage {
                 const SizedBox(width: 10),
                 Flexible(
                   child: Text(
-                    file!.name,
+                    file.name,
                     maxLines: 2,
                     overflow: TextOverflow.ellipsis,
                     style: const TextStyle(fontWeight: FontWeight.bold),
@@ -107,7 +106,7 @@ class ChatMessage {
             errorListener: (value) {},
             httpHeaders: SessionManager().requireNextcloud().authHeaders,
             imageUrl:
-                'https://${EndpointData().nextcloud().full()}/index.php/core/preview?fileId=${file!.id}&x=130&y=-1&a=1',
+                'https://${EndpointData().nextcloud().full()}/index.php/core/preview?fileId=${file.id}&x=130&y=-1&a=1',
           ),
           if (originalMessage != '{file}') ...[
             SizedBox(height: 5),