fix(qt): Shift and Ctrl work on every select-mode click target, not only the row body

Excel-style selection (750c59034) read the modifiers only where a row BODY
took the click. Every other target a select-mode surface draws dropped them,
so a Shift-click there was a plain toggle:

  - the track row's checkbox disc passed Qt.NoModifier;
  - QbzCheckbox and SelectCheck emitted toggled() with no argument, so the
    Library album rows, the local album rows and the folder rows, which
    already expected `function (mods)`, received undefined;
  - AlbumCard emitted selectToggled() with no argument, and the paged local
    albums grid (299dcde5b) spelled the drop out as Qt.NoModifier.

Some targets were never selection targets at all: in select mode the artist
and album names on a track row, the artist and label on a Library album row
and the artist line of an album card still navigated, leaving the page and
the selection mid-gesture. The row links stand down in select mode so the
click reaches the row body with its modifiers, and the card's artist line
toggles like its artwork and title. A hover-only tooltip on the pulled but
cached glyph no longer eats the row's click.

Reproduced on the release binary in a nested KWin with injected input: in
Local Library Tracks, the checkbox discs of rows 1, Shift 4 and Ctrl 6
selected 3 rows; the same clicks on the row bodies selected 5. No list
view, Flickable or wheel code changes; tst_wheel passes unchanged.

tst_multi_select clicks each of these targets through the real TrackRow,
AlbumListRow, AlbumCard, QbzCheckbox and SelectCheck.

cc

crates/qbz-qt/qml/views/AlbumListRow.qml

@@ -304,8 +304,11 @@ Rectangle {
                     id: artistArea
                     anchors.fill: parent
                     // Only a real artist id is clickable — otherwise the
-                    // pointer promises a page that cannot open.
-                    enabled: (root.item.artistId || "") !== ""
+                    // pointer promises a page that cannot open. In select
+                    // mode the whole row selects (Shift / Ctrl included), so
+                    // the name stops being a link and the click falls to the
+                    // row body underneath.
+                    enabled: !root.selectMode && (root.item.artistId || "") !== ""
                     hoverEnabled: true
                     cursorShape: Qt.PointingHandCursor
                     onClicked: QbzArtist.openArtist(root.item.artistId)
@@ -331,7 +334,8 @@ Rectangle {
                 MouseArea {
                     id: labelArea
                     anchors.fill: parent
-                    enabled: (root.item.labelId || "") !== ""
+                    // Not a link in select mode, for the artist name's reason.
+                    enabled: !root.selectMode && (root.item.labelId || "") !== ""
                     hoverEnabled: true
                     cursorShape: Qt.PointingHandCursor
                     onClicked: QbzHome.openLabel(root.item.labelId)