feat: companion app improvements and intro overlay

Android: NES controller/keyboard enhancements, WebSocket reconnect,
portrait mode. Backend: remote input handler updates. UI: companion
intro overlay on dashboard, relay improvements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/api/remote-relay.ts

@@ -99,7 +99,7 @@ function mapKey(xdotoolKey: string): string {
 }
 
 function handleMessage(data: string) {
-  let msg: { t: string; k?: string; x?: number; y?: number; b?: number }
+  let msg: { t: string; k?: string; x?: number; y?: number; b?: number; p?: number }
   try {
     msg = JSON.parse(data)
   } catch {
@@ -114,6 +114,18 @@ function handleMessage(data: string) {
     case 'k': {
       if (!msg.k) break
       const key = mapKey(msg.k)
+      // Dispatch player-tagged event for arcade/game apps (iframe postMessage or direct listeners)
+      const player = msg.p ?? 0 // 0 = untagged/broadcast, 1 = P1, 2 = P2
+      document.dispatchEvent(new CustomEvent('arcade-input', {
+        detail: { key, player, type: 'down' },
+        bubbles: true,
+      }))
+      // Also post to any iframe that might be listening (containerized apps like BotFights)
+      const iframe = document.querySelector('iframe') as HTMLIFrameElement | null
+      if (iframe?.contentWindow) {
+        iframe.contentWindow.postMessage({ type: 'arcade-input', key, player, action: 'down' }, '*')
+      }
+      // Keep existing keydown/keyup for backward compat with non-arcade UI navigation
       document.dispatchEvent(new KeyboardEvent('keydown', { key, bubbles: true }))
       document.dispatchEvent(new KeyboardEvent('keyup', { key, bubbles: true }))
       break