fix: first wall row sizing when < max

Pad number of wallpapers to the number of walls in a row so when < they
dont expand to fill the entire row

modules/nexus/pages/wallandstyle/WallpaperCategory.qml

@@ -26,13 +26,22 @@ PageBase {
         columnSpacing: Tokens.spacing.large
 
         Repeater {
-            model: Wallpapers.list.filter(w => Wallpapers.getCategoryFor(w) === root.nState.selectedWallpaperCategory).sort((a, b) => a.name.localeCompare(b.name))
+            model: {
+                const walls = Wallpapers.list.filter(w => Wallpapers.getCategoryFor(w) === root.nState.selectedWallpaperCategory).sort((a, b) => a.name.localeCompare(b.name));
+                while (walls.length < Config.nexus.wallpapersPerRow)
+                    walls.push(null);
+                return walls;
+            }
 
             WallItem {
                 required property FileSystemEntry modelData
 
-                source: modelData.path
+                // Empty placeholders for sizing
-                text: modelData.name
+                opacity: modelData ? 1 : 0
+                enabled: modelData
+
+                source: String(modelData?.path ?? "")
+                text: modelData?.name ?? ""
                 onClicked: {
                     Wallpapers.setWallpaper(modelData.path);
                     root.nState.closeSubPage();

modules/nexus/pages/wallandstyle/WallpaperSelect.qml

@@ -109,14 +109,24 @@ PageBase {
                                 categories[category] = w;
                         }
                     }
-                    return Object.values(categories);
+                    const cats = Object.values(categories);
+                    while (cats.length < Config.nexus.wallpapersPerRow)
+                        cats.push(null);
+                    return cats;
                 }
 
                 WallItem {
                     required property FileSystemEntry modelData
 
-                    source: modelData.path
+                    // Empty placeholders for sizing
+                    opacity: modelData ? 1 : 0
+                    enabled: modelData
+
+                    source: String(modelData?.path ?? "")
                     text: {
+                        if (!modelData)
+                            return "";
+
                         if (modelData.parentDir !== Paths.wallsdir) {
                             const category = Wallpapers.getCategoryFor(modelData);
                             return category.slice(0, 1).toUpperCase() + category.slice(1);