SessionView: surface a "View only" badge in the chrome

When a connection is configured with viewOnly=true, the controller silently
drops every key, pointer, and scroll event. Without a visible indicator the
behavior looks like the keyboard is broken. Yellow capsule next to the
connection label makes it obvious.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Packages/VNCUI/Sources/VNCUI/Session/SessionView.swift

@@ -112,6 +112,19 @@ public struct SessionView: View {
 
                 connectionLabel(controller: controller)
 
+                if controller.viewOnly {
+                    HStack(spacing: 4) {
+                        Image(systemName: "eye.fill")
+                            .font(.caption2)
+                        Text("View only")
+                            .font(.caption.weight(.semibold))
+                    }
+                    .foregroundStyle(.yellow)
+                    .padding(.horizontal, 10)
+                    .padding(.vertical, 5)
+                    .glassSurface(in: Capsule())
+                }
+
                 Spacer()
             }
             .padding(.horizontal, 12)