feat(qbz-qt): phase 3 — Discover > Home with live Qobuz data and artwork

Pure mapping port of home.rs/foryou.rs (quality tiers, award ribbons,
slim grids) into Slint-free rows; discover index + favorites +
release-watch + top artists fetched concurrently (12 sections, ~170
cards live-verified). Artwork via the shared qbz-cache ImageCacheService
(semaphore-16 downloads, file:// rows, native QML decode). HomeView.qml:
tab pill, five rail kinds, shimmer skeleton, error+Retry, offline
placeholder — exact msgids throughout. Sections travel as one JSON
document (cxx-qt-lib cannot nest QVariant containers — documented).

km

crates/qbz-qt/build.rs

@@ -17,7 +17,10 @@ fn collect_qrc_files(dir: &Path, out: &mut Vec<String>) {
 }
 
 fn main() {
-    let mut qrc_files: Vec<String> = vec!["qml/assets/qbz-logo.png".to_string()];
+    let mut qrc_files: Vec<String> = vec![
+        "qml/assets/qbz-logo.png".to_string(),
+        "qml/assets/hi-res.svg".to_string(),
+    ];
     collect_qrc_files(Path::new("qml/assets/icons"), &mut qrc_files);
     collect_qrc_files(Path::new("qml/assets/fonts"), &mut qrc_files);
     // Non-QML resources land at qrc:/qt/qml/com/blitzfc/qbz/<path> — QML