feat(frontend): update import sample and fix image handling

[lpcoutinho]

🎯 Objetivo

Atualizar o arquivo de exemplo para importação de contatos e corrigir o componente de imagem.

✅ Alterações Realizadas

1. Atualização do Arquivo de Exemplo

• public/downloads/import-contacts-sample.csv atualizado com exemplos de CPF/CNPJ formatados
• Demonstrado o novo formato sanitizado (apenas números)
• Incluídos exemplos para todos os campos suportados

2. Correção no Componente de Imagem

• src/components/chat/messages/MessageImage.tsx: melhorado tratamento de erros no carregamento de imagens
• Ajustada a lógica de fallback para imagens inválidas

🧪 Testes

• Verificação do download do CSV de exemplo
• Teste de importação com o novo arquivo de exemplo
• Validação da exibição de imagens no chat

🔗 Issues Relacionadas

• Relacionado ao PR de otimização de contatos: feat(contact): optimize contact import and pagination performance evo-ai-crm-community#40

Summary by Sourcery

Update contact import sample CSV and improve chat image handling.

New Features:

• Provide an updated contact import sample CSV with formatted and sanitized CPF/CNPJ examples and all supported fields documented.

Bug Fixes:

• Improve error handling and fallback logic for invalid or failed image loads in the chat message image component.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the contact import CSV sample to illustrate formatted and sanitized CPF/CNPJ values and enriches it with examples for all supported fields, and hardens the chat MessageImage component’s error handling and fallback logic for invalid or failed image loads.

File-Level Changes

Change	Details	Files
Update contact import CSV sample to document new CPF/CNPJ formatting and provide comprehensive field examples.	Replaced existing sample contact rows with ones that show both formatted CPF/CNPJ and their sanitized numeric-only representations. Expanded the CSV to include example values for all currently supported contact fields. Ensured the CSV column ordering and headers align with the backend’s expected import schema.	public/downloads/import-contacts-sample.csv
Improve robustness of chat image rendering by tightening error handling and fallback behavior.	Adjusted the MessageImage render logic to detect and handle image load errors explicitly (e.g., onError handlers or state-based tracking). Updated fallback behavior so that broken or invalid image URLs display a consistent fallback state instead of partially rendered or broken UI. Refined any conditional rendering or props handling to account for invalid image metadata coming from messages.	src/components/chat/messages/MessageImage.tsx

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