refactored and condensed technical documentation and comments across the codebase to improve readability

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

@@ -114,12 +114,8 @@ class _ChatTextfieldState extends State<ChatTextfield> {
 
   @override
   void dispose() {
-    // Clear the published bar height only after this unmount completes. Setting
-    // the shared notifier synchronously here fires its listener (the download
-    // tray's AnimatedBuilder → setState) while the element tree is locked during
-    // teardown, throwing "setState() called when widget tree was locked".
-    // Running it at the end of the frame lets the reset land once the tree is
-    // writable again; a newly opened chat re-publishes its own height afterwards.
+    // Defer to end-of-frame: resetting the shared notifier synchronously during
+    // teardown fires setState while the tree is locked ("widget tree was locked").
     WidgetsBinding.instance.addPostFrameCallback(
       (_) => downloadChipBottomObstruction.value = 0,
     );