fix: terminal WebSocket connection timing + better mock fallback

- Fix xterm.js container not found: use requestAnimationFrame retry loop
  instead of single $nextTick (Alpine x-for renders asynchronously)
- Better mock fallback: use host name+IP instead of raw UUID
- Add logging for WebSocket connection path (found/not-found/hostname)

app/backend/internal/handler/terminal.go

@@ -48,10 +48,16 @@ func TerminalWS(c *websocket.Conn) {
 	log.Printf("WS connected: host=%s", hostID)
 
 	host, found := hostStore.Get(hostID)
-	if !found || host.Hostname == "" {
+	if !found {
+		log.Printf("Host %s not found, using mock", hostID)
 		mockTerminal(c, hostID)
 		return
 	}
+	if host.Hostname == "" {
+		log.Printf("Host %s has no hostname, using mock (name=%s, ip=%s)", hostID, host.Name, host.IP)
+		mockTerminal(c, host.Name+" ("+host.IP+")")
+		return
+	}
 
 	client, err := sshconn.Dial(host)
 	if err != nil {

app/backend/static/js/terminal.js

@@ -108,13 +108,16 @@ document.addEventListener('alpine:init', () => {
 
       this._createTerminal(id, host.name);
 
-      this.$nextTick(() => {
+      const tryOpen = (retries) => {
         const container = document.getElementById('xterm-' + id);
         if (container) {
           this.terminals[id].open(container);
           this._connectWebSocket(id, host.id, host.name);
+        } else if (retries > 0) {
+          requestAnimationFrame(() => tryOpen(retries - 1));
         }
-      });
+      };
+      this.$nextTick(() => tryOpen(10));
     },
 
     switchTab(i) {