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

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

config/dot/quickshell/services/AudioDevices.qml

@@ -27,6 +27,16 @@ Singleton {
     readonly property var applications: AudioStreams.group(
         root.playbackStreams, PwNodeType.AudioOutStream)
 
+    // The capture side of the same story: which applications currently hold the
+    // microphone open. Same grouping rules as playback, so an application that
+    // records on three streams reads as one entry with one mute.
+    readonly property var captureStreams: Pipewire.nodes.values.filter(node =>
+        node.ready && node.audio
+        && (node.type & PwNodeType.AudioInStream) === PwNodeType.AudioInStream)
+
+    readonly property var captureApplications: AudioStreams.group(
+        root.captureStreams, PwNodeType.AudioInStream)
+
     function nodes(output: bool): var {
         return output ? root.outputs : root.inputs;
     }
@@ -58,8 +68,11 @@ Singleton {
         return AudioStreams.muted(application);
     }
 
-    function setApplicationVolume(application: var, value: real): bool {
-        return AudioStreams.setVolume(application, value);
+    // `max` is the clamp ceiling; omitting it means 1, and anything that is not
+    // a positive number is treated as omitted. Callers that honor the
+    // over-amplification setting pass 1.5.
+    function setApplicationVolume(application: var, value: real, max: real): bool {
+        return AudioStreams.setVolume(application, value, max);
     }
 
     function setApplicationMuted(application: var, muted: bool): bool {