fix: use double requestAnimationFrame to ensure terminal dimensions are stable before fitting

src/frontend/index.html

@@ -231,7 +231,15 @@
 
       term.loadAddon(fitAddon);
       term.open(terminalContainer);
-      fitAddon.fit();
+      requestAnimationFrame(() => {
+        requestAnimationFrame(() => {
+          fitAddon.fit();
+          if (ws && ws.readyState === WebSocket.OPEN) {
+            ws.send(`\x1b[8;${term.rows};${term.cols}t`);
+          }
+          term.focus();
+        });
+      });
 
       ws.binaryType = 'arraybuffer';