perf: Use tail-only replay by default for faster terminal loading

- Change default to tailOnly=true (was false)
- Reduce chunks from 500 to 200
- Applies to both FloatingTerminal and TerminalPage

frontend/src/components/FloatingTerminal.vue

@@ -547,9 +547,9 @@ function scrollTerminal(direction: 'up' | 'down' | 'end') {
   else renderer.scrollToBottom()
 }
 
-function requestReplay(tailOnly = false) {
+function requestReplay(tailOnly = true) {
   if (socket?.readyState === WebSocket.OPEN) {
-    socket.send(JSON.stringify({ type: 'request-replay', tailOnly, chunks: 500 }))
+    socket.send(JSON.stringify({ type: 'request-replay', tailOnly, chunks: 200 }))
   }
 }