fix: account for proxy pipeline latency in switch overlay duration

Add 4s for the WS-to-Belkin-to-Avocent pipeline delay before the key
sequence starts executing, plus 1s settle time after for the video
stream to stabilize. Total overlay = 4s + (pauses * pause_duration) + 1s.

[deploy: frontend]

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/ericrfb-frontend/src/pages/console.ts

@@ -199,9 +199,11 @@ function switchToPort(port: number) {
   const hotkey = portHotkeys[port]
   if (!hotkey || ws?.readyState !== WebSocket.OPEN) return
 
-  // Count pause tokens to calculate total switch duration
+  // Total duration: proxy round-trip + key sequence execution + settle time
   const pauseCount = (hotkey.match(/\*/g) || []).length
-  const duration = Math.max((pauseCount * keyPauseDuration) + 500, 1000)
+  const proxyLatency = 4000 // WS → proxy → Belkin → Avocent pipeline delay
+  const settleTime = 1000  // wait for video stream to stabilize after switch
+  const duration = proxyLatency + (pauseCount * keyPauseDuration) + settleTime
 
   // Suspend input and show overlay
   inputSuspended = true