counter on feed select

vue/src/composables/useFeeds.js

@@ -22,6 +22,17 @@ const feedTitles = computed(() => {
   if (feedFilter.value) titles.add(feedFilter.value)
   return [...titles].sort((a, b) => a.localeCompare(b))
 })
+// Unread count per feed title, shown next to each option in the filter
+// <select>. Derived from the master (allItems) so article view's
+// read-but-still-shown items are excluded. A title kept in feedTitles with no
+// unread items left has no key here — render it as 0.
+const feedUnreadCounts = computed(() => {
+  const counts = {}
+  for (const item of allItems.value) {
+    if (!item.read) counts[item.feedTitle] = (counts[item.feedTitle] ?? 0) + 1
+  }
+  return counts
+})
 // The header badge count: unread items in the selected feed when a filter is
 // active, otherwise the global unread total. Derived from the master (allItems)
 // rather than the displayed `feeds` so article view's read-but-still-shown
@@ -466,6 +477,7 @@ export function useFeeds() {
     allItems,
     feedFilter,
     feedTitles,
+    feedUnreadCounts,
     unreadCount,
     setFeedFilter,
     showMessage,