StemRoller: desktop stem separator, Android stems player, and server daemons

- stemroller/: PySide6/QML desktop app and player for separating music into stems
- android/: Plex music player that plays per-stem mixes, with Android Auto support,
  a graphic + parametric (Equalizer APO-style) EQ, and offline downloads
- server/: stemserve (serves stems to the app) and stemd (separates the library on
  the server's GPU, with "Stem Now" priority requests)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

stemroller/qml/StemRoller/QueueItem.qml

@@ -0,0 +1,89 @@
+import QtQuick
+import QtQuick.Controls.Basic
+
+ItemDelegate {
+    id: item
+    required property string jobId
+    required property string fileName
+    required property string modelLabel
+    required property string status
+    required property real progress
+    required property string stage
+    required property int index
+    readonly property bool selected: app.selected.valid && app.selected.id === jobId
+    readonly property bool active: status === "running" || status === "queued"
+
+    width: ListView.view ? ListView.view.width : 200
+    height: active ? 84 : 66
+    hoverEnabled: true
+    padding: 0
+    onClicked: app.select(jobId)
+    Behavior on height { NumberAnimation { duration: Theme.med; easing.type: Easing.BezierSpline; easing.bezierCurve: Theme.ease } }
+
+    background: Rectangle {
+        radius: 8
+        color: item.selected ? Theme.alpha(Theme.primary, 0.16) : (item.hovered ? Qt.rgba(1, 1, 1, 0.05) : "transparent")
+        border.color: item.selected ? Theme.alpha(Theme.primary, 0.45) : "transparent"
+        Behavior on color { ColorAnimation { duration: Theme.fast } }
+        Rectangle {
+            visible: item.selected
+            x: 0
+            anchors.verticalCenter: parent.verticalCenter
+            width: 3
+            height: parent.height - 20
+            radius: 2
+            color: Theme.accentGlow
+        }
+    }
+
+    contentItem: Item {
+        Column {
+            anchors { left: parent.left; right: parent.right; top: parent.top; leftMargin: 12; rightMargin: 6; topMargin: 10 }
+            spacing: 6
+            Row {
+                width: parent.width
+                spacing: 8
+                Icon {
+                    anchors.verticalCenter: parent.verticalCenter
+                    size: 16
+                    name: item.status === "done" ? "check" : item.status === "error" ? "error" : "music"
+                    color: item.status === "done" ? Theme.success : item.status === "error" ? Theme.error : Theme.textLo
+                }
+                Txt {
+                    width: parent.width - 16 - 28 - 16
+                    anchors.verticalCenter: parent.verticalCenter
+                    text: item.fileName
+                    font.weight: item.selected ? Font.DemiBold : Font.Medium
+                }
+                IconButton {
+                    anchors.verticalCenter: parent.verticalCenter
+                    size: 24
+                    iconSize: 14
+                    iconName: "close"
+                    glow: false
+                    tip: item.active ? "Cancel" : "Remove"
+                    onClicked: item.active ? app.cancelJob(item.jobId) : app.removeJob(item.jobId)
+                }
+            }
+            Row {
+                width: parent.width
+                spacing: 8
+                Txt {
+                    width: parent.width - chip.width - 14
+                    anchors.verticalCenter: parent.verticalCenter
+                    text: item.status === "running" ? item.stage : item.modelLabel
+                    font.pixelSize: Theme.fs12
+                    color: Theme.textLo
+                }
+                StatusChip { id: chip; status: item.status; progress: item.progress }
+            }
+            StripedProgress {
+                visible: item.active
+                width: parent.width - 6
+                value: item.progress
+                active: item.status === "running"
+                opacity: item.status === "running" ? 1 : 0.35
+            }
+        }
+    }
+}