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/components/subscriptions/RecentArrivalsCard.vue

@@ -0,0 +1,80 @@
+<template>
+  <v-card v-if="arrivals.length" class="mb-4">
+    <CardHeading icon="mdi-new-box" title="Recent arrivals">
+      <v-spacer />
+      <v-btn
+        variant="text" size="small" rounded="pill"
+        to="/subscriptions?tab=downloads"
+      >
+        All downloads
+        <v-icon end size="small">mdi-arrow-right</v-icon>
+      </v-btn>
+    </CardHeading>
+    <v-card-text class="pt-0">
+      <div
+        v-for="ev in arrivals" :key="ev.id"
+        class="fc-arrival"
+      >
+        <router-link
+          v-if="ev.artist_slug"
+          :to="`/artist/${ev.artist_slug}`"
+          class="fc-arrival__artist"
+        >{{ ev.artist_name || ev.artist_slug }}</router-link>
+        <span v-else class="fc-arrival__artist">{{ ev.artist_name || '—' }}</span>
+        <span class="fc-arrival__meta">
+          {{ ev.platform }} ·
+          {{ ev.files_count ? `${ev.files_count} file(s)` : 'no new files' }}
+          · {{ formatRelative(ev.started_at) }}
+        </span>
+      </div>
+    </v-card-text>
+  </v-card>
+</template>
+
+<script setup>
+import { onMounted, onUnmounted, ref } from 'vue'
+
+import CardHeading from '../common/CardHeading.vue'
+import { formatRelative } from '../../utils/date.js'
+import { useApi } from '../../composables/useApi.js'
+
+// "What came in?" — the other half of the landing tab's daily answer
+// (2026-07-02). Own fetch, own state: the downloads store's event list is
+// the Downloads tab's FILTERED feed; borrowing it would couple this card to
+// whatever filter the operator left that tab on.
+const api = useApi()
+const arrivals = ref([])
+let pollId = null
+
+async function load() {
+  try {
+    const events = await api.get('/api/downloads', {
+      params: { status: 'ok', limit: 25 },
+    })
+    // Real arrivals only — scheduled scans that found nothing are noise here.
+    arrivals.value = events.filter((e) => (e.files_count || 0) > 0).slice(0, 6)
+  } catch { /* non-fatal — the card just hides */ }
+}
+
+onMounted(() => {
+  load()
+  pollId = setInterval(() => { if (!document.hidden) load() }, 60000)
+})
+onUnmounted(() => { if (pollId) clearInterval(pollId) })
+</script>
+
+<style scoped>
+.fc-arrival {
+  display: flex; align-items: baseline; gap: 10px;
+  padding: 4px 0;
+}
+.fc-arrival__artist {
+  font-weight: 600; text-decoration: none;
+  color: rgb(var(--v-theme-accent));
+}
+.fc-arrival__artist:hover { text-decoration: underline; }
+.fc-arrival__meta {
+  font-size: 12px;
+  color: rgb(var(--v-theme-on-surface-variant));
+}
+</style>