feat: enhance ErrorModal and chat components with new features and improvements

- Refactored ErrorModal to utilize a dialog element for better accessibility and user experience, including a close button with an icon.
- Updated chat components to improve participant display and message read status, enhancing user engagement and clarity.
- Introduced loading indicators for user and conversation data in SalaReuniaoManager to improve responsiveness during data fetching.
- Enhanced message handling in MessageList to indicate whether messages have been read, providing users with better feedback on message status.
- Improved overall structure and styling across various components for consistency and maintainability.

apps/web/src/lib/components/ausencias/WizardSolicitacaoAusencia.svelte

@@ -158,7 +158,6 @@
 <div class="wizard-ausencia">
   <!-- Header -->
   <div class="mb-6">
-    <h2 class="text-3xl font-bold text-primary mb-2">Nova Solicitação de Ausência</h2>
     <p class="text-base-content/70">Solicite uma ausência para assuntos particulares</p>
   </div>