Add VM Monitor Link

Nucleic-Session: 7D59F478-3AC7-4ED2-937F-58546F918C7E
Co-authored-by: Nucleic <[email protected]>

Sources/NucleicApp/TranscriptRow.swift

@@ -559,6 +559,38 @@ private struct AuthErrorRow: View {
     }
 }
 
+/// The in-chat rendering for a "VM opened" note — the one-time line the backend drops when an agent
+/// first boots a macOS or Linux guest for this session. Instead of a plain log row it shows the note
+/// text with a one-click "Open VM Monitor" button that surfaces the monitor panel for the chat (so the
+/// user can watch the guest's screen). The VM-side sibling of `AuthErrorRow`'s "Log in" button; the
+/// button is absent (`onOpen == nil`) when no panel host is wired, degrading to a plain line.
+private struct VMMonitorNoteRow: View {
+    @Environment(\.appPalette) private var palette
+    let text: String
+    let icon: String
+    let onOpen: (() -> Void)?
+
+    var body: some View {
+        HStack(alignment: .firstTextBaseline, spacing: 6) {
+            Image(systemName: icon)
+                .font(.caption).foregroundStyle(.secondary).frame(width: 16)
+            Text(text)
+                .font(.callout).foregroundStyle(.secondary)
+                .lineLimit(2).textSelection(.enabled)
+            if let onOpen {
+                Button(action: onOpen) {
+                    Label("Open VM Monitor", systemImage: "display")
+                        .font(.caption.weight(.semibold))
+                }
+                .buttonStyle(.borderedProminent)
+                .controlSize(.small)
+                .tint(palette.accent)
+            }
+            Spacer(minLength: 0)
+        }
+    }
+}
+
 /// A sent (user) message bubble, right-aligned, with a "revert to here" arrow tucked
 /// beneath it that reveals on hover. Tapping the arrow asks to wipe this message and
 /// everything after it and drop the text back into the composer to edit (see