feat: enhance safety filters for shell commands by normalizing ANSI-C quoting

src/app/runtime/stream/mod.rs

@@ -65,10 +65,11 @@ impl SseParser {
                 events.extend(self.flush_event());
             } else if let Some(ty) = line.strip_prefix("event: ") {
                 self.event_type = Some(ty.trim().to_string());
-            } else if let Some(data) = line.strip_prefix("data: ") {
-                self.data_lines.push(data.to_string());
-            } else if line.starts_with("data:") {
-                self.data_lines.push(String::new());
+            } else if let Some(data) = line.strip_prefix("data:") {
+                // Handle both "data: {...}" (with space) and "data:{...}"
+                // (without space). Some providers omit the trailing space.
+                let data = data.trim_start().to_string();
+                self.data_lines.push(data);
             }
         }
         events
@@ -119,7 +120,21 @@ impl SseParser {
                         tracing::warn!("[stream] total_tokens missing in usage chunk");
                         prompt_tokens + completion_tokens
                     });
-                return vec![StreamEvent::Usage { prompt_tokens, completion_tokens, total_tokens }];
+                // Only emit Usage as a standalone event if this chunk
+                // contains nothing else (no choices, no delta). Some
+                // non-standard providers may bundle usage WITH content
+                // in the same chunk; emitting both prevents content loss.
+                let has_other_content = value.get("choices")
+                    .and_then(|c| c.as_array())
+                    .map(|arr| arr.iter().any(|ch| {
+                        ch.get("delta").and_then(|d| d.get("content")).is_some()
+                            || ch.get("delta").and_then(|d| d.get("reasoning_content")).is_some()
+                            || ch.get("delta").and_then(|d| d.get("tool_calls")).is_some()
+                    }))
+                    .unwrap_or(false);
+                if !has_other_content {
+                    return vec![StreamEvent::Usage { prompt_tokens, completion_tokens, total_tokens }];
+                }
             }
         }
         match event_type.as_str() {