fc3e: PostsView + /posts route — IntersectionObserver infinite scroll, URL-driven filters

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/router.js

@@ -9,6 +9,7 @@ import SeriesReaderView from './views/SeriesReaderView.vue'
 import SubscriptionsView from './views/SubscriptionsView.vue'
 import CredentialsView from './views/CredentialsView.vue'
 import DownloadsView from './views/DownloadsView.vue'
+import PostsView from './views/PostsView.vue'
 
 // The application's front door. `/` redirects here. Changing the front door
 // is a one-line edit (e.g. '/gallery' or '/tags').
@@ -31,6 +32,7 @@ const routes = [
   { path: '/settings', name: 'settings', component: SettingsView, meta: { title: 'Settings' } },
 
   // FC-3: subscription backbone
+  { path: '/posts',         name: 'posts',         component: PostsView,         meta: { title: 'Posts'         } },
   { path: '/subscriptions', name: 'subscriptions', component: SubscriptionsView, meta: { title: 'Subscriptions' } },
   { path: '/credentials',   name: 'credentials',   component: CredentialsView,   meta: { title: 'Credentials'   } },
   { path: '/downloads',     name: 'downloads',     component: DownloadsView,     meta: { title: 'Downloads'     } }

frontend/src/views/PostsView.vue

@@ -0,0 +1,106 @@
+<template>
+  <v-container class="py-6" max-width="900">
+    <PostsFilterBar
+      :artist-id="artistFilter"
+      :platform="platformFilter"
+      @update:filters="onFilters"
+    />
+
+    <v-alert v-if="store.error" type="error" variant="tonal" closable class="mb-3">
+      {{ String(store.error) }}
+    </v-alert>
+
+    <div v-if="store.loading && store.items.length === 0" class="fc-posts__loading">
+      <v-progress-circular indeterminate color="accent" size="36" />
+    </div>
+
+    <div v-else-if="store.items.length === 0 && store.done" class="fc-posts__empty">
+      <p>No posts yet. Subscribe to a source on the
+        <RouterLink to="/subscriptions">Subscriptions</RouterLink>
+        tab to start capturing posts.
+      </p>
+    </div>
+
+    <div v-else>
+      <PostCard v-for="p in store.items" :key="p.id" :post="p" />
+
+      <div ref="sentinel" class="fc-posts__sentinel">
+        <v-progress-circular v-if="store.loading" indeterminate color="accent" size="24" />
+        <span v-else-if="store.done" class="fc-posts__end">End of stream</span>
+      </div>
+    </div>
+  </v-container>
+</template>
+
+<script setup>
+import { computed, onMounted, onUnmounted, ref, watch } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import { usePostsStore } from '../stores/posts.js'
+import PostsFilterBar from '../components/posts/PostsFilterBar.vue'
+import PostCard from '../components/posts/PostCard.vue'
+
+const route = useRoute()
+const router = useRouter()
+const store = usePostsStore()
+
+const artistFilter = computed(() => {
+  const raw = route.query.artist_id
+  return raw == null ? null : Number(raw)
+})
+const platformFilter = computed(() => route.query.platform || null)
+
+const sentinel = ref(null)
+let observer = null
+
+async function reload() {
+  await store.loadInitial({
+    artist_id: artistFilter.value,
+    platform: platformFilter.value,
+  })
+}
+
+function onFilters({ artist_id, platform }) {
+  const q = { ...route.query }
+  if (artist_id == null) delete q.artist_id
+  else q.artist_id = String(artist_id)
+  if (!platform) delete q.platform
+  else q.platform = platform
+  router.replace({ query: q })
+}
+
+watch(() => [artistFilter.value, platformFilter.value], reload)
+
+onMounted(async () => {
+  await reload()
+  observer = new IntersectionObserver((entries) => {
+    if (entries.some(e => e.isIntersecting)) {
+      store.loadMore()
+    }
+  }, { rootMargin: '400px 0px' })
+  if (sentinel.value) observer.observe(sentinel.value)
+})
+
+onUnmounted(() => {
+  if (observer) observer.disconnect()
+})
+</script>
+
+<style scoped>
+.fc-posts__loading,
+.fc-posts__empty {
+  display: flex;
+  justify-content: center;
+  padding: 2rem;
+  color: rgb(var(--v-theme-on-surface-variant));
+}
+.fc-posts__sentinel {
+  display: flex;
+  justify-content: center;
+  padding: 1.5rem 0;
+  min-height: 2rem;
+}
+.fc-posts__end {
+  color: rgb(var(--v-theme-on-surface-variant));
+  font-size: 0.85rem;
+}
+</style>