feat: enhance push notification management and error handling

- Implemented error handling for unhandled promise rejections related to message channels, improving stability during push notification operations.
- Updated the PushNotificationManager component to manage push subscription registration with timeouts, preventing application hangs.
- Enhanced the sidebar and chat components to display user avatars, improving user experience and visual consistency.
- Refactored email processing logic to support scheduled email sending, integrating new backend functionalities for better email management.
- Improved overall error handling and logging across components to reduce console spam and enhance debugging capabilities.

apps/web/src/lib/components/chat/ChatWindow.svelte

@@ -77,23 +77,22 @@
     <!-- Botão Voltar -->
     <button
       type="button"
-      class="btn btn-ghost btn-sm btn-circle"
+      class="btn btn-ghost btn-sm btn-circle hover:bg-primary/20 transition-all duration-200 hover:scale-110"
       onclick={voltarParaLista}
       aria-label="Voltar"
+      title="Voltar para lista de conversas"
     >
       <svg
         xmlns="http://www.w3.org/2000/svg"
-        fill="none"
         viewBox="0 0 24 24"
-        stroke-width="1.5"
+        fill="none"
         stroke="currentColor"
-        class="w-5 h-5"
+        stroke-width="2.5"
+        stroke-linecap="round"
+        stroke-linejoin="round"
+        class="w-6 h-6 text-primary"
       >
-        <path
-          stroke-linecap="round"
-          stroke-linejoin="round"
-          d="M10.5 19.5 3 12m0 0 7.5-7.5M3 12h18"
-        />
+        <path d="M19 12H5M12 19l-7-7 7-7"/>
       </svg>
     </button>