fix(qt): pass the cortinilla row's block padding in instead of reading parent

The row width read parent.leftPadding / parent.rightPadding. It works at
runtime - the parent is always a Column that has them - but `parent` is typed
QQuickItem, which does not, so qmllint cannot verify it and a wrong mount
would fail silently at runtime instead of loudly in the audit. Parent-chain
bindings are a documented trap in this port for exactly that reason.

The padding is now a property each mount site sets. Cortinilla.qml is
qmllint-clean.

Found by running qmllint over the files this branch touched, after two
identifiers were written before being verified against the source - a
Flickable forceLayout() that does not exist, caught by the smoke, and a
tracksQuery property that does not exist, caught by reading. Neither the
resolution audit nor the singleton xref can see this class of error: they
check component types and BRIDGE members, not view-local properties. qmllint
does, and it is now part of the gate.

cc

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

@@ -347,7 +347,7 @@ Item {
                             font.weight: theme.weightSemibold
                             verticalAlignment: Text.AlignVCenter
                         }
-                        CortRow { row: root.hasTop ? root.doc.top : ({}) }
+                        CortRow { row: root.hasTop ? root.doc.top : ({}); blockPadding: 6 }
                     }
 
                     // Sections.
@@ -407,6 +407,7 @@ Item {
                                 delegate: CortRow {
                                     required property var modelData
                                     row: modelData
+                                    blockPadding: 6
                                 }
                             }
                         }
@@ -429,11 +430,19 @@ Item {
     // --- One result row (CortinillaResultRow) ------------------------------
     component CortRow: Rectangle {
         property var row: ({})
-        // A QML Column's padding does NOT size its children, so `parent.width`
-        // made every row 12px wider than its block. clip hid the overflow, but
-        // the highlight ran flush to the right edge while staying inset 6px on
-        // the left — asymmetric. Subtract the padding explicitly.
-        width: parent ? parent.width - (parent.leftPadding || 0) - (parent.rightPadding || 0) : 0
+        // A QML Column's padding does NOT size its children, so a plain
+        // `parent.width` made every row 12px wider than its block: clip hid
+        // the overflow, but the highlight ran flush to the right edge while
+        // staying inset 6px on the left — asymmetric.
+        //
+        // The padding is passed IN rather than read off `parent`. Reading it
+        // through the parent chain works at runtime but is invisible to
+        // qmllint (`parent` is typed QQuickItem, which has no leftPadding),
+        // so a wrong mount would fail silently at runtime instead of loudly
+        // in the audit — and parent-chain bindings are a documented trap in
+        // this port.
+        property int blockPadding: 0
+        width: parent ? parent.width - 2 * blockPadding : 0
         height: 56
         radius: theme.radiusSm
         readonly property bool active: QbzSearch.cortinillaSelectedIndex === (row.flatIndex ?? -2)