feat(qt): kiosk profile release hardening

Integrate the Kiosk profile hardening round: 12 dedicated Kiosk views plus
22 shared opt-in hosts, shared navigation history with Back/Forward, Albums
as the default library tab, native paged Local Library (artists/tracks),
lightweight MyQBZ grid and detail, Ephemeral lifecycle, bounded lists and
artwork sized to the physical frame, static skeletons, 64px transport bar,
Settings touch reflow and a persistent Immersive exit.

Desktop keeps its prior behavior: every shared component defaults to the
desktop path and only opts into Kiosk behavior through explicit properties
(origin-relative ScrollMemory, viewport-bounded artwork requests).

Regression coverage: kiosk navigation and artwork Node tests added to the
runtime gate, scroll-origin fixtures for fixed and grouped rows, i18n
strings for all eight locales.

Verified by 750 release tests, six QML audits, Kiosk smokes at 800x480 and
1280x800 and a Desktop A/B with seven pixel-identical captures.

cc

crates/qbz-qt/qml/controls/QbzMultiSelectBar.qml

@@ -33,6 +33,7 @@ import "../theme"
 
 Rectangle {
     id: root
+    property bool kioskHost: false
 
     /// [{ id, label, icon, danger, needsSelection }] — `id` is what `action`
     /// publishes; `label` is the tooltip text and must arrive ALREADY
@@ -75,8 +76,8 @@ Rectangle {
                     required property var modelData
                     readonly property bool armed: !modelData.needsSelection
                         || root.selectedCount > 0
-                    width: 34
-                    height: 30
+                    width: root.kioskHost ? 44 : 34
+                    height: root.kioskHost ? 44 : 30
                     anchors.verticalCenter: parent.verticalCenter
                     radius: theme.radiusSm
                     opacity: armed ? 1.0 : 0.4