fix(qconnect): harden queue ownership handoffs

Preserve local playback when it is authoritative, make renderer conflicts explicit and persist the selected policy. Filter unsupported queue rows, restore portable Qobuz identities after disconnect, and fence takeover commands to avoid stale queue and playback loops.

cx

crates/qbz-qt/build.rs

@@ -669,6 +669,7 @@ fn main() {
                 // device flyout both bars mount + the diagnostics modal
                 // AppShell mounts last.
                 "qml/shell/QconnectFlyout.qml",
+                "qml/shell/QconnectPlaybackConflictModal.qml",
                 "qml/shell/LogViewerModal.qml",
                 "qml/shell/ReportIssueModal.qml",
                 "qml/shell/QconnectDevModal.qml",