fix(recipe): prevent empty grid by removing preserveScroll from refresh triggers

Bug: when scrolling down on recipes page, any operation with
preserveScroll: true would fetch only page 1 data then restore
scroll position to beyond the loaded items, leaving the grid empty.

Fix:
- Remove preserveScroll: true from all 7 must-refresh trigger
  paths (filter, search, sort, import, settings reload, sync,
  rebuild cache, sidebar folder nav)
- Replace full list refresh with updateSingleItem() for repair
  and bulk missing-LoRA download operations
- Update tests to match new scroll-free behavior

static/js/managers/BulkMissingLoraDownloadManager.js

@@ -309,9 +309,22 @@ export class BulkMissingLoraDownloadManager {
             }, 'warning');
         }
 
-        // Refresh the recipes list to update LoRA status
-        if (window.recipeManager) {
-            window.recipeManager.loadRecipes({ preserveScroll: true });
+        // Update each affected recipe card with fresh data (LoRA inLibrary flags changed)
+        if (state.virtualScroller) {
+            const { extractRecipeId } = await import('../api/recipeApi.js');
+            for (const recipe of this.pendingRecipes) {
+                const recipeId = extractRecipeId(recipe.file_path);
+                if (!recipeId) continue;
+                try {
+                    const detailRes = await fetch(`/api/lm/recipe/${encodeURIComponent(recipeId)}`);
+                    if (detailRes.ok) {
+                        const updated = await detailRes.json();
+                        state.virtualScroller.updateSingleItem(recipe.file_path, updated);
+                    }
+                } catch (e) {
+                    console.warn('Failed to update recipe card after LoRA download:', e);
+                }
+            }
         }
     }