fix(explore): Render empty state text as a block element

Render `EmptyStateText` as a `div` so loading states can safely include
block-level children like `LoadingIndicator` without invalid HTML.

Refs LOGS-644
Co-Authored-By: GPT-5.4 <noreply@openai.com>

Made-with: Cursor

Author: nsdeschenes

static/app/views/explore/tables/tracesTable/styles.tsx

@@ -134,7 +134,7 @@ export function EmptyStateText({
 }) {
   return (
     <Container>
-      <Text size={size} align={textAlign} variant="muted">
+      <Text as="div" size={size} align={textAlign} variant="muted">
         {children}
       </Text>
     </Container>