implemented comprehensive accessibility (A11y) support across the app

lib/view/pages/talk/widgets/chat_tile.dart

@@ -14,6 +14,7 @@ import '../../../../routing/app_routes.dart';
 import '../../../../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../../../../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
 import '../../../../utils/haptics.dart';
+import '../../../../widget/a11y/a11y_labels.dart';
 import '../../../../widget/async_action_button.dart';
 import '../../../../widget/confirm_dialog.dart';
 import '../../../../widget/debug/debug_tile.dart';
@@ -106,6 +107,7 @@ class _ChatTileState extends State<ChatTile> {
                   Icons.star,
                   color: Colors.amberAccent,
                   size: 15,
+                  semanticLabel: A11yLabels.favorite,
                 ),
               ),
             ),
@@ -123,7 +125,11 @@ class _ChatTileState extends State<ChatTile> {
           ),
           if (widget.hasDraft) ...[
             const SizedBox(width: 5),
-            const Icon(Icons.edit_outlined, size: 15),
+            const Icon(
+              Icons.edit_outlined,
+              size: 15,
+              semanticLabel: A11yLabels.draft,
+            ),
           ],
         ],
       ),
@@ -134,17 +140,25 @@ class _ChatTileState extends State<ChatTile> {
       ),
       trailing: widget.data.unreadMessages <= 0
           ? null
-          : Container(
-              padding: const EdgeInsets.all(1),
-              decoration: BoxDecoration(
-                color: Theme.of(context).primaryColor,
-                borderRadius: BorderRadius.circular(30),
-              ),
-              constraints: const BoxConstraints(minWidth: 20, minHeight: 20),
-              child: Text(
-                '${widget.data.unreadMessages}',
-                style: const TextStyle(color: Colors.white, fontSize: 15),
-                textAlign: TextAlign.center,
+          : Semantics(
+              label: '${widget.data.unreadMessages} ${A11yLabels.unread}',
+              child: ExcludeSemantics(
+                child: Container(
+                  padding: const EdgeInsets.all(1),
+                  decoration: BoxDecoration(
+                    color: Theme.of(context).primaryColor,
+                    borderRadius: BorderRadius.circular(30),
+                  ),
+                  constraints: const BoxConstraints(
+                    minWidth: 20,
+                    minHeight: 20,
+                  ),
+                  child: Text(
+                    '${widget.data.unreadMessages}',
+                    style: const TextStyle(color: Colors.white, fontSize: 15),
+                    textAlign: TextAlign.center,
+                  ),
+                ),
               ),
             ),
       onTap: () {