fix: raise TradeSnap request timeout from 15s to 30s

The first screenshot request of each batch pays extra browser-session
cleanup time in TradeSnap (~16s total), which the 15s client timeout
misclassified as a failure while the capture actually succeeded.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/notion.rs

@@ -232,7 +232,7 @@ impl NotionWriter {
             };
             let tradesnap_url = url.trim_end_matches('/');
             let http_client = reqwest::Client::builder()
-                .timeout(std::time::Duration::from_secs(15))
+                .timeout(std::time::Duration::from_secs(30))
                 .build()
                 .unwrap_or_else(|_| reqwest::Client::new());
             let mut children = Vec::new();