feat(web-ui): redesign dashboard and live sessions

cmd/web-ui/main.go

@@ -10,6 +10,7 @@ import (
 	"net/url"
 	"os"
 	"strings"
+	"sync"
 
 	"github.com/gorilla/websocket"
 )
@@ -58,24 +59,38 @@ func main() {
 		}
 		defer uiConn.Close()
 
-		// Bidirectional copy
+		var uiMu, upstreamMu sync.Mutex
+
+		// upstream → UI
 		done := make(chan struct{})
 		go func() {
+			defer close(done)
 			for {
 				_, msg, err := conn.ReadMessage()
 				if err != nil {
 					break
 				}
-				uiConn.WriteMessage(websocket.TextMessage, msg)
+				uiMu.Lock()
+				err = uiConn.WriteMessage(websocket.TextMessage, msg)
+				uiMu.Unlock()
+				if err != nil {
+					break
+				}
 			}
-			close(done)
 		}()
+
+		// UI → upstream
 		for {
 			_, msg, err := uiConn.ReadMessage()
 			if err != nil {
 				break
 			}
-			conn.WriteMessage(websocket.TextMessage, msg)
+			upstreamMu.Lock()
+			err = conn.WriteMessage(websocket.TextMessage, msg)
+			upstreamMu.Unlock()
+			if err != nil {
+				break
+			}
 		}
 		<-done
 	})
@@ -89,10 +104,14 @@ func main() {
 		fileServer.ServeHTTP(w, r)
 	})
 
-	// SPA catch-all: serve index.html for all other routes
+	// SPA catch-all: serve index.html for routes without file extensions
 	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		// Serve index.html for SPA routes
+		// If the path contains a dot, it's likely a missing static asset
-		if r.URL.Path == "/" || strings.HasPrefix(r.URL.Path, "/sessions") || strings.HasPrefix(r.URL.Path, "/runs") || strings.HasPrefix(r.URL.Path, "/infrastructure") || strings.HasPrefix(r.URL.Path, "/agents") {
+		if strings.Contains(r.URL.Path, ".") {
+			http.NotFound(w, r)
+			return
+		}
+
 		f, err := staticFiles.Open("static/index.html")
 		if err != nil {
 			http.Error(w, "index.html not found", http.StatusInternalServerError)
@@ -102,10 +121,6 @@ func main() {
 
 		w.Header().Set("Content-Type", "text/html; charset=utf-8")
 		_, _ = io.Copy(w, f)
-			return
-		}
-
-		http.NotFound(w, r)
 	})
 
 	log.Printf("web-ui listening on %s", addr)

cmd/web-ui/static/index.html

@@ -17,7 +17,10 @@
       <h1><a href="/">agentmon<span class="logo-dot"></span></a></h1>
     </div>
     <nav><a href="/">Dashboard</a><a href="/sessions">Sessions</a><a href="/agents">Agents</a><a href="/infrastructure">Infra</a></nav>
+    <div class="header-right">
+      <span class="ws-dot" id="ws-dot" title="Disconnected"></span>
       <button class="theme-toggle" id="theme-toggle" aria-label="Toggle theme"></button>
+    </div>
   </header>
   <main id="app">
     <p>Loading...</p>