agent: foundation — sync incremental changes from legacy codebase

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/transcription/src/model_manager.rs

@@ -91,7 +91,7 @@ async fn download_file(
     );
 
     let client = reqwest::Client::builder()
-        .timeout(std::time::Duration::from_secs(30))
+        .connect_timeout(std::time::Duration::from_secs(30))
         .build()
         .map_err(|e| KonError::DownloadFailed(e.to_string()))?;