fix(qt): polish purchases queue and search loading

cx

crates/qbz-qt/qml/shell/AudioStamp.qml

@@ -38,6 +38,9 @@ Item {
 
     /// Width clamp (Slint: the VerticalLayout's max-width at the call site).
     property int maxWidth: 150
+    /// AppShell's shared topmost tooltip. The Small/Large desktop bars pass it
+    /// through so the bubble is outside every clipped player-bar subtree.
+    property Item tooltipHost: null
 
     // Manual tier label: hires→HI-RES, mp3→MP3, lossless→LOSSLESS, else→CD.
     readonly property string tierLabel: QbzPlayer.npQualityTier === "hires" ? "HI-RES"
@@ -132,20 +135,41 @@ Item {
             spacing: 5
 
             Text {
+                id: backendLed
                 text: QbzPlayer.npOutputBackendLabel
                 font.pixelSize: 7
                 font.weight: Font.Bold
                 color: QbzPlayer.npOutputBackendActive ? "#5b8def" : theme.textMuted
                 elide: Text.ElideRight
                 anchors.verticalCenter: parent.verticalCenter
+                MouseArea {
+                    anchors.fill: parent
+                    hoverEnabled: true
+                    onContainsMouseChanged: {
+                        if (root.tooltipHost)
+                            root.tooltipHost.hover(containsMouse, backendLed,
+                                "npb-backend", QbzPlayer.npOutputBackendTooltip)
+                    }
+                }
             }
             Text {
+                id: modeLed
                 text: QbzPlayer.npOutputModeLabel
                 font.pixelSize: 7
                 font.weight: Font.Bold
                 color: QbzPlayer.npOutputModeActive ? "#3fae6a" : theme.textMuted
                 elide: Text.ElideRight
                 anchors.verticalCenter: parent.verticalCenter
+                MouseArea {
+                    anchors.fill: parent
+                    hoverEnabled: true
+                    onContainsMouseChanged: {
+                        if (root.tooltipHost)
+                            root.tooltipHost.hover(containsMouse, modeLed,
+                                "npb-output-mode",
+                                QbzSession.tr("Output mode", QbzSession.trRev))
+                    }
+                }
             }
         }
 

crates/qbz-qt/qml/shell/NowPlayingBarSmall.qml

@@ -463,6 +463,7 @@ Rectangle {
                     AudioStamp {
                         visible: QbzPlayer.npHasTrack
                         anchors.verticalCenter: parent.verticalCenter
+                        tooltipHost: root.tooltip
                         maxWidth: (QbzPlayer.npIsRemote && QbzPlayer.npCastTarget !== "")
                             ? 280 : 150
                     }

crates/qbz-qt/qml/shell/PlayerBar.qml

@@ -448,6 +448,7 @@ Rectangle {
                     anchors.verticalCenter: parent.verticalCenter
                     showArt: !root.largeActive
                     showBadges: !root.largeActive
+                    tooltip: root.tooltip
                     onTrackInfoRequested: root.openTrackInfo()
                 }
                 // Classic: transport cluster hugging the left edge (plain
@@ -512,6 +513,7 @@ Rectangle {
                     AudioStamp {
                         visible: root.largeActive && QbzPlayer.npHasTrack
                         maxWidth: 140
+                        tooltipHost: root.tooltip
                         anchors.verticalCenter: parent.verticalCenter
                     }
                     Item { visible: root.largeActive; width: 12; height: 1 }
@@ -687,6 +689,7 @@ Rectangle {
                 x: controlsLayout.classicTransportRight
                     + (availableWidth - width) / 2
                 anchors.verticalCenter: parent.verticalCenter
+                tooltip: root.tooltip
                 onTrackInfoRequested: root.openTrackInfo()
             }
         }

crates/qbz-qt/qml/shell/SongCard.qml

@@ -45,6 +45,8 @@ Rectangle {
     // Small bar: title+meta as a TIGHT centred group instead of the
     // full-height, space-distributed column.
     property bool textCenter: false
+    /// AppShell's shared topmost tooltip, forwarded to the in-card stamp.
+    property Item tooltip: null
 
     // Furniture is admitted by intrinsic fit, not by a window breakpoint.
     // When a host becomes genuinely narrow, metadata keeps the runway and the
@@ -383,6 +385,7 @@ Rectangle {
 
     SongCardStamp {
         id: stamp
+        tooltipHost: root.tooltip
         visible: root.showBadges && root.stampFits && QbzPlayer.npHasTrack
         anchors.right: parent.right
         // Classic (glass) insets the stamp by pad + stamp-right-margin

crates/qbz-qt/qml/shell/SongCardStamp.qml

@@ -33,6 +33,10 @@ Column {
 
     spacing: 4
     width: 128
+    // AppShell's single topmost QbzTooltip. Desktop NPB modes pass it through
+    // SongCard so long device labels are measured by the shared bubble and
+    // cannot be clipped by the player bar.
+    property Item tooltipHost: null
 
     // SongCard.slint's show-delivered / quality-cause-line /
     // quality-stamp-tooltip, verbatim.
@@ -165,12 +169,17 @@ Column {
             id: ledHover
             anchors.fill: parent
             hoverEnabled: true
+            onContainsMouseChanged: {
+                if (root.tooltipHost && led.tooltip !== "")
+                    root.tooltipHost.hover(containsMouse, led,
+                                           "npb-led-" + led.label, led.tooltip)
+            }
         }
         // Bubble geometry: see Tip below — same numbers, read off
         // shell/TooltipOverlay.slint.
         ToolTip {
             id: ledTip
-            visible: ledHover.containsMouse && led.tooltip !== ""
+            visible: !root.tooltipHost && ledHover.containsMouse && led.tooltip !== ""
             text: led.tooltip
             delay: 0
             timeout: -1
@@ -328,7 +337,7 @@ Column {
                 label: QbzPlayer.npOutputBackendLabel
                 on: QbzPlayer.npOutputBackendActive
                 litColor: "#5b8def"
-                tooltip: QbzSession.tr("Audio backend", QbzSession.trRev)
+                tooltip: QbzPlayer.npOutputBackendTooltip
                 anchors.verticalCenter: parent.verticalCenter
             }
             DotLed {