feat(subagent): add progress event handling and formatting for subagent execution

src/app/review/mod.rs

@@ -368,6 +368,7 @@ pub fn trigger_review(state: &mut AppStateRest) {
                 SubagentEvent::StepFailed { step, error } => {
                     tracing::warn!("[review] step {} failed: {}", step, error);
                 }
+                SubagentEvent::Progress(_) => {}
                 SubagentEvent::Completed { .. } => {
                     tracing::debug!("[review] completed");
                 }