feat(ia): wave 3 — Subscriptions landing answers 'what needs me, what came in?'

Daily-use reorder of the Subscriptions tab: needs-attention strip first
(FailingSourcesCard moves up from below the Downloads fold — a broken
subscription was invisible unless you went looking), then a new Recent
arrivals card (real downloads only, no-change scans filtered out, artist
links), then the source list. Both cards render nothing when there's nothing
to say.

Retry logic moves into the downloads store (retrySource / retryAllFailing) so
the needs-attention card and the Downloads maintenance menu share one
implementation — single-retry forces past cooldown, bulk keeps cooldown
enforcement, same tally shape. The card's Logs button deep-links into the
Downloads tab pre-filtered (?source_id now watched, not just read on mount).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

frontend/src/stores/downloads.js

@@ -3,6 +3,7 @@ import { ref } from 'vue'
 import { useApi } from '../composables/useApi.js'
 import { useAsyncAction } from '../composables/useAsyncAction.js'
 import { useInflightToken } from '../composables/useInflightToken.js'
+import { useSourcesStore } from './sources.js'
 
 export const useDownloadsStore = defineStore('downloads', () => {
   const api = useApi()
@@ -106,6 +107,44 @@ export const useDownloadsStore = defineStore('downloads', () => {
     return failing.value
   }
 
+  // --- Failing-source retries (shared by the Subscriptions needs-attention
+  // card and the Downloads maintenance menu — one implementation for both
+  // surfaces). Data-only: callers own the toasts, per this store's style.
+  // A single deliberate retry forces past cooldown; BULK retries keep
+  // cooldown enforcement ON so N failing sources on one platform don't all
+  // retry into the very rate limit the cooldown is preventing.
+  async function retrySource(source) {
+    const sourcesStore = useSourcesStore()
+    try {
+      await sourcesStore.checkNow(source.id, { force: true })
+      return 'queued'
+    } catch (e) {
+      if (e?.body?.download_event_id) return 'already_running'
+      throw e
+    } finally {
+      await Promise.all([loadFailing(), loadStats(24)])
+    }
+  }
+
+  async function retryAllFailing(sources) {
+    const sourcesStore = useSourcesStore()
+    const tally = { ok: 0, deferred: 0, conflict: 0 }
+    try {
+      for (const s of sources) {
+        try {
+          const body = await sourcesStore.checkNow(s.id)
+          if (body?.status === 'deferred') tally.deferred += 1
+          else tally.ok += 1
+        } catch (e) {
+          if (e?.body?.download_event_id) tally.conflict += 1
+        }
+      }
+    } finally {
+      await Promise.all([loadFailing(), loadStats(24)])
+    }
+    return tally
+  }
+
   async function loadActive() {
     const [running, pending] = await Promise.all([
       api.get('/api/downloads', { params: { status: 'running', limit: 50 } }),
@@ -128,5 +167,6 @@ export const useDownloadsStore = defineStore('downloads', () => {
     loadFirst, loadMore, loadOne, loadLastForSource, applyFilter,
     closeDetail, loadStats,
     loadActivity, loadFailing, loadActive, recoverStalled,
+    retrySource, retryAllFailing,
   }
 })