perf: parallelize checkAllSources with Promise.allSettled

frontend/src/views/Dashboard.vue

@@ -37,7 +37,7 @@
               <v-icon>mdi-alert-circle</v-icon>
             </v-avatar>
             <div>
-              <div class="text-h4">{{ stats?.failed || 0 }}</div>
+              <div class="text-h4">{{ stats?.active_failed || 0 }}</div>
               <div class="text-caption">Failed Downloads</div>
             </div>
           </v-card-text>
@@ -354,7 +354,7 @@ const sourcesWithErrors = computed(() => {
   return Array.from(sourceMap.values()).slice(0, 5)
 })
 
-const failedCount = computed(() => stats.value?.failed || 0)
+const failedCount = computed(() => stats.value?.active_failed || 0)
 const activeDownloadsCount = computed(() =>
   (stats.value?.queued || 0) + (stats.value?.running || 0)
 )
@@ -461,16 +461,16 @@ async function checkAllSources() {
   checkingAll.value = true
   try {
     const enabledSources = sourcesStore.sources.filter(s => s.enabled)
-    let queued = 0
-    for (const source of enabledSources) {
-      try {
-        await sourcesStore.triggerCheck(source.id)
-        queued++
-      } catch (e) {
-        console.error(`Failed to queue ${source.id}:`, e)
-      }
+    const results = await Promise.allSettled(
+      enabledSources.map(source => sourcesStore.triggerCheck(source.id))
+    )
+    const queued = results.filter(r => r.status === 'fulfilled').length
+    const failed = results.filter(r => r.status === 'rejected').length
+    if (failed > 0) {
+      notifications.success(`Queued ${queued} sources (${failed} failed to queue)`)
+    } else {
+      notifications.success(`Queued checks for ${queued} sources`)
     }
-    notifications.success(`Queued checks for ${queued} sources`)
     await fetchActiveDownloads()
     await downloadsStore.fetchStats()
   } catch (error) {
@@ -483,7 +483,7 @@ async function checkAllSources() {
 async function retryAllFailed() {
   retryingAll.value = true
   try {
-    const response = await downloadsStore.fetchDownloads({ status: 'failed', per_page: 100 })
+    const response = await downloadsStore.fetchDownloads({ status: 'failed', per_page: 100, exclude_superseded: true })
     const failed = response.items
     let retried = 0
     for (const dl of failed) {