fix: hide View Trace and Trace ID for logs without trace context

Coerce empty/falsy trace IDs to undefined so logs without actual trace
data don't show the View Trace button or Copy Trace ID action.

Made-with: Cursor

Author: elizabetdev

packages/app/src/components/DBRowSidePanel.tsx

@@ -387,7 +387,8 @@ export const DBRowSidePanelInner = ({
   }, [timestampDate]);
 
   const focusDate = timestampDate;
-  const traceId: string | undefined = normalizedRow?.['__hdx_trace_id'];
+  const traceId: string | undefined =
+    normalizedRow?.['__hdx_trace_id'] || undefined;
 
   const childSourceId =
     source.kind === 'log'