* fix: Ensure safe access to agent capabilities in AgentConfig
* fix: don't show agent builder if agents endpoint is not enabled
* fix: Improve error logging for MCP tool calls
* fix: Enhance error message for MCP tool failures
* feat: Add optional spec and iconURL properties to TEndpointOption type
* chore: Update condition to use constant for new conversation parameter
* feat: Enhance abort error handling with additional endpoint options to properly render error message fields
* fix: Throw error instead of returning message for failed MCP tool calls
* refactor: separate logic to generate new S3 URLs for expired links
* feat: Implement S3 URL refresh for user avatars with error handling
* fix: authcontext error in chats where agent chain is used
* refactor: streamline balance configuration logic in getBalanceConfig function
* fix: enhance icon resolution logic in SpecIcon component
* fix: allow null values for spec and iconURL in TEndpointOption type
* fix: update balance check to allow null tokenCredits
