Add universal cursor hover-to-translate detector and cache-busting headers

server/index.js

@@ -185,8 +185,16 @@ app.get('/api/translate', async (req, res) => {
   res.json({ word, english: null });
 });
 
-// Serve static frontend files from project root
+// Serve static frontend files from project root with no-cache headers so updates apply immediately
 const PUBLIC_DIR = path.resolve(__dirname, '..');
+app.use((req, res, next) => {
+  if (!req.path.startsWith('/api/tts')) {
+    res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate');
+    res.setHeader('Pragma', 'no-cache');
+    res.setHeader('Expires', '0');
+  }
+  next();
+});
 app.use('/data', express.static(path.join(PUBLIC_DIR, 'data')));
 app.get('/styles.css', (_req, res) => res.sendFile(path.join(PUBLIC_DIR, 'styles.css')));
 app.get('/app.js', (_req, res) => res.sendFile(path.join(PUBLIC_DIR, 'app.js')));