feat: adjust center group threshold to 250 for chat words

client/src/App.jsx

@@ -1171,13 +1171,14 @@ export default function App() {
                   const fontScale = isMobile ? 0.45 : 1.0;
                   const remToPx = 16;
 
-                  // Identify center group: words with count within 500 of the max count,
-                  // but ONLY if the top count is >= 500. Also cap center group size to at most 3 words.
+                  const centerGroupThreshold = wordType === 'chat' ? 250 : 500;
+                  // Identify center group: words with count within threshold of the max count,
+                  // but ONLY if the top count is >= threshold. Also cap center group size to at most 3 words.
                   const centerGroupWords = currentWordsList.filter((w, idx) => 
-                    idx === 0 || (maxCount >= 500 && (maxCount - w.word_count) < 500 && idx < 3)
+                    idx === 0 || (maxCount >= centerGroupThreshold && (maxCount - w.word_count) < centerGroupThreshold && idx < 3)
                   );
                   const otherWordsList = currentWordsList.filter((w, idx) => 
-                    !(idx === 0 || (maxCount >= 500 && (maxCount - w.word_count) < 500 && idx < 3))
+                    !(idx === 0 || (maxCount >= centerGroupThreshold && (maxCount - w.word_count) < centerGroupThreshold && idx < 3))
                   );
                   
                   const maxOtherCount = otherWordsList.length > 0 ? Math.max(...otherWordsList.map(x => x.word_count)) : 1;
@@ -1203,7 +1204,7 @@ export default function App() {
 
                   for (let i = 0; i < currentWordsList.length; i++) {
                     const w = currentWordsList[i];
-                    const isCenterGroup = i === 0 || (maxCount >= 500 && (maxCount - w.word_count) < 500 && i < 3);
+                    const isCenterGroup = i === 0 || (maxCount >= centerGroupThreshold && (maxCount - w.word_count) < centerGroupThreshold && i < 3);
                     
                     let fontSize;
                     let fontWeight;