feat(network): enable HTTP error validation in Ktor HttpClient

[therajanmaurya]

Summary

• Add expectSuccess = true to the default HttpClient configuration
• This enables Ktor's response validation which throws exceptions for non-2xx responses

Changes

• ClientRequestException is thrown for 4xx responses
• ServerResponseException is thrown for 5xx responses

Why

Without this setting, non-2xx responses are silently returned as successful responses, making proper error handling impossible. The response body would be attempted to be parsed as the success type, often leading to confusing deserialization errors instead of proper HTTP error handling.

Test plan

• Verify 4xx responses throw ClientRequestException
• Verify 5xx responses throw ServerResponseException
• Existing API calls continue to work for 2xx responses

🤖 Generated with Claude Code

[niyajali]

To prevent application crashes when the API fails for reasons such as network issues or server problems, we must implement client-side error handling, preferably by using a try-catch block or a custom interceptor or a sealed interface/class with custom errors data classes with serializable fields