Use max file size for validating attachments in Stream Dashboard

[laevandus]

🎯 Goal

• Use ChatClient.appSettings for validating attachment file sizes

🛠 Implementation

Consume LLC provided app settings when checking for max size.

🧪 Testing

N/A

☑️ Checklist

• I have signed the Stream CLA (required)
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Affected documentation updated (docusaurus, tutorial, CMS (task created)

[sonarcloud]

Quality Gate passed

Issues
52 New issues
0 Accepted issues

Measures
0 Security Hotspots
73.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud