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

lib/push/push_renderer.dart

@@ -147,13 +147,11 @@ class PushRenderer {
     bool alert = true,
   }) async {
     if (messages.isEmpty) return;
-    // A silent render only ever UPDATES an existing card (delete-push shrunk
-    // the thread, late avatar arrived, failed reply needs its spinner
-    // stopped). If the card is verifiably gone meanwhile (reply/mark-read
-    // cleanup cancelled it, or the user swiped it away), re-posting would
-    // resurrect it — and Android would re-attach a pending inline reply on
-    // top. Probe failure (null) still renders: stopping a possible reply
-    // spinner outweighs a rare resurrection.
+    // A silent render only UPDATES an existing card. If the card is verifiably
+    // gone (cleanup cancelled it or the user swiped it away), re-posting would
+    // resurrect it — with Android re-attaching a pending inline reply on top.
+    // Probe failure (null) still renders: stopping a possible reply spinner
+    // outweighs a rare resurrection.
     if (!alert && await _isChatNotificationActive(chatToken) == false) {
       debugPrint('PushRenderer: skip silent re-render, card gone ($chatToken)');
       return;