Give Sound the whole story, and keep the buttons inside the card

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/sound-page-harness.qml

@@ -1,5 +1,10 @@
 // Read-only contract harness for the Sound page. It instantiates every device
 // row against the real PipeWire graph but exposes no mutating IPC methods.
+//
+// The two services that read the machine rather than the graph -- SoundDefaults
+// and SoundCards -- are fed through their own fixture seams by the contract, so
+// the ghost row and the profile card can be measured against canned state
+// instead of against whatever hardware is plugged in today.
 
 import Quickshell
 import Quickshell.Io
@@ -34,6 +39,20 @@ ShellRoot {
         height: 900
     }
 
+    // A device list of its own, so the ghost row can be read without reaching
+    // into the page's internals.
+    SoundDeviceList {
+        id: outputList
+        width: 620
+        visible: false
+        output: true
+    }
+
+    SoundCaptureRow {
+        id: captureProbe
+        width: 620
+    }
+
     ApplicationMixer {
         id: populatedMixer
         width: 620
@@ -78,7 +97,15 @@ ShellRoot {
                 emptyRows: emptyMixer.rowCount,
                 emptyStatus: emptyMixer.statusText,
                 unavailableRows: unavailableMixer.rowCount,
-                unavailableStatus: unavailableMixer.statusText
+                unavailableStatus: unavailableMixer.statusText,
+                captureApplications: AudioDevices.captureApplications.length,
+                captureTypesValid: AudioDevices.captureApplications.every(application =>
+                    application.nodes.every(node =>
+                        (node.type & PwNodeType.AudioInStream)
+                            === PwNodeType.AudioInStream)),
+                captureRowVisible: captureProbe.visible,
+                ghostVisible: !!outputList.absent,
+                ghostLabel: outputList.absent ? String(outputList.absent.label) : ""
             });
         }
     }