fix(ui): finish pending Qt interaction polish

Keep segmented controls within their visual well, use the active theme for playback indicators, disconnect inactive pulse receivers and improve near-fit song metadata.

cx

crates/qbz-qt/qml/immersive/AlbumReactivePanel.qml

@@ -206,7 +206,6 @@ Item {
             // Track info (shared, homologated across the panels, :173-176).
             ImmersiveTrackMeta {
                 width: root.width
-                equalizerTint: "#7c3aed"
             }
         }
     }

crates/qbz-qt/qml/immersive/CoverflowPanel.qml

@@ -354,7 +354,6 @@ Item {
             // fan + metadata read as one balanced group (:276-283).
             ImmersiveTrackMeta {
                 width: root.width
-                equalizerTint: "#7c3aed"
             }
         }
     }

crates/qbz-qt/qml/immersive/EqualizerBars.qml

@@ -25,12 +25,15 @@
 
 import QtQuick
 import com.blitzfc.qbz
+import "../theme"
 
 Item {
     id: root
 
-    /// Bar color — every immersive mount passes #7c3aed.
-    property color tint: "#7c3aed"
+    QbzTheme { id: theme }
+
+    /// Bar color follows the active theme unless a host deliberately overrides it.
+    property color tint: theme.accent
 
     width: 18
     height: 14
@@ -43,8 +46,12 @@ Item {
     // (180 Hz on the owner's panel) and every update is a whole-window
     // present. The wave's period is 800 ms, so the 30 Hz pulse samples it
     // ~24 times per loop — indistinguishable. Riding the pulse also means
-    // ZERO extra presents: the bars move in the same frame as everything
-    // else the pulse moves.
+    // ZERO extra clocks: the bars move in the same frame as everything else
+    // the pulse moves. A pulse receiver still has CPU cost, though, so an
+    // inactive indicator disconnects structurally instead of waking a JS
+    // handler just to return. TrackRow also loads this object only for the
+    // one active, visible play cell; a long expanded box set therefore owns
+    // one receiver rather than one receiver per track.
     //
     // The `active` gate belongs to the HOST, because this component mounts
     // in always-alive-but-invisible trees (the immersive overlay) where a
@@ -58,10 +65,9 @@ Item {
     property real t: 0
     readonly property int _tickMs: 33
     Connections {
-        target: QbzShell
+        target: root.active && root.visible ? QbzShell : null
         function onPulseMsChanged() {
-            if (root.active && root.visible)
-                root.t = (root.t + root._tickMs / 800.0) % 1.0
+            root.t = (root.t + root._tickMs / 800.0) % 1.0
         }
     }
 

crates/qbz-qt/qml/immersive/ImmersiveTrackMeta.qml

@@ -20,12 +20,15 @@
 import QtQuick
 import com.blitzfc.qbz
 import "../controls"
+import "../theme"
 
 Column {
     id: root
 
-    /// Equalizer tint + "Now Playing" label color (Slint equalizer-tint).
-    property color equalizerTint: "#7c3aed"
+    QbzTheme { id: theme }
+
+    /// Equalizer tint + "Now Playing" label follow the active theme.
+    property color equalizerTint: theme.accent
 
     spacing: 6
 

crates/qbz-qt/qml/immersive/ImmersiveView.qml

@@ -541,7 +541,6 @@ Item {
                     ImmersiveTrackMeta {
                         anchors.horizontalCenter: parent.horizontalCenter
                         width: parent.width - 44
-                        equalizerTint: "#7c3aed"
                     }
                 }
             }

crates/qbz-qt/qml/immersive/StaticPanel.qml

@@ -116,7 +116,6 @@ Item {
             // Track info (shared, homologated across the panels, :106-109).
             ImmersiveTrackMeta {
                 width: root.width
-                equalizerTint: "#7c3aed"
             }
         }
     }