fix(slint): search results 1:1 with Tauri

- Most popular: a crowned hero inline with the artists carousel; its
  cover now resolves (a dedicated artwork target was missing).
- Artists: a real carousel on the All tab, ArtistCard restyled to the
  Tauri For-You tile with a Follow chip (favorites the artist) shown
  when the user does not follow it.
- Playlists: a PlaylistCarousel of PlaylistCard, with a count-based
  PlaylistCollage (1/2/3/4-up) instead of a flat row list.
- Carousels gained a View all link; result counts removed from titles.
- searchType filter is a styled radio row (ring + accent dot) at the
  top right with a clear button, not a dropdown.
- Title fixed to Search Results.
- QbzCore::favorite_artist_ids backs the follow state.

cc

crates/qbz-slint/ui/discover/Carousel.slint

@@ -42,10 +42,34 @@ component NavButton inherits Rectangle {
     }
 }
 
+component ViewAllLink inherits Rectangle {
+    callback clicked();
+    width: link-text.preferred-width + 16px;
+    height: 26px;
+    border-radius: 4px;
+    background: ta.has-hover ? Theme.surface-hover : transparent;
+    link-text := Text {
+        text: @tr("View all");
+        color: Theme.accent;
+        font-size: 14px;
+        font-weight: Typography.medium;
+        x: (parent.width - self.width) / 2;
+        y: (parent.height - self.height) / 2;
+    }
+    ta := TouchArea {
+        mouse-cursor: pointer;
+        clicked => {
+            root.clicked();
+        }
+    }
+}
+
 export component Carousel inherits VerticalLayout {
     in property <DiscoverSection> section;
+    in property <bool> show-view-all: false;
     callback album-clicked(string);
     callback media-action(string, string, string);
+    callback view-all-clicked();
 
     property <length> card-width: 220px;
     property <length> card-height: 266px;
@@ -97,6 +121,14 @@ export component Carousel inherits VerticalLayout {
                     }
                 }
             }
+            if root.show-view-all: VerticalLayout {
+                alignment: center;
+                ViewAllLink {
+                    clicked => {
+                        root.view-all-clicked();
+                    }
+                }
+            }
         }
     }