admin: streamline item modal actions

backend/src/db.js

@@ -148,6 +148,37 @@ function mapCustomItemRow(row) {
   }
 }
 
+function getSharedItemDisplayPriority(item) {
+  if (!item) return 99
+  if (item.sourceType === 'user' && !item.replacedAt) return 0
+  if (item.sourceType === 'user') return 1
+  if (item.sourceType === 'template') return 2
+  if (item.sourceType === 'asset' || item.isAssetLibraryItem) return 3
+  return 4
+}
+
+function collapseSharedLibraryItems(items) {
+  const grouped = new Map()
+  for (const item of items || []) {
+    const key = String(item?.src || '').trim()
+    if (!key) continue
+    if (!grouped.has(key)) grouped.set(key, [])
+    grouped.get(key).push(item)
+  }
+
+  return Array.from(grouped.values())
+    .map((group) =>
+      group
+        .slice()
+        .sort((a, b) => {
+          const priorityDiff = getSharedItemDisplayPriority(a) - getSharedItemDisplayPriority(b)
+          if (priorityDiff !== 0) return priorityDiff
+          return Number(b.createdAt || 0) - Number(a.createdAt || 0)
+        })[0]
+    )
+    .sort((a, b) => Number(b.createdAt || 0) - Number(a.createdAt || 0))
+}
+
 function mapImageAssetRow(row) {
   if (!row) return null
   return {
@@ -1832,7 +1863,7 @@ async function getCustomItemUsageMeta() {
   }
 }
 
-async function listCustomItems({ queryText = '', page = 1, limit = 50, filterMode = 'all' } = {}) {
+async function listCustomItems({ queryText = '', page = 1, limit = 50, filterMode = 'all', collapseShared = false } = {}) {
   const normalizedLimit = Math.min(Math.max(Number(limit) || 50, 1), 200)
   const normalizedPage = Math.max(Number(page) || 1, 1)
   const searchText = (queryText || '').trim()
@@ -2076,9 +2107,10 @@ async function listCustomItems({ queryText = '', page = 1, limit = 50, filterMod
     })
     .sort((a, b) => Number(b.createdAt || 0) - Number(a.createdAt || 0))
 
-  const total = allItems.length
+  const visibleItems = collapseShared ? collapseSharedLibraryItems(allItems) : allItems
+  const total = visibleItems.length
   const offset = (normalizedPage - 1) * normalizedLimit
-  const pagedItems = allItems.slice(offset, offset + normalizedLimit)
+  const pagedItems = visibleItems.slice(offset, offset + normalizedLimit)
 
   return {
     items: pagedItems,