feat(series): Add-to-series control + Series browse view + nav (FC-6.2)

Completes FC-6.2 with the UI.

- PostSeriesMenu: a "Series ▾" control on each post card — "New series from
  this post" (promote → navigates to manage) and "Add to existing series…"
  (dialog with a browsable picker loaded from GET /api/series, client-side
  filtered — avoids the empty-autocomplete #712 trap).
- SeriesView (/series): a top-level Series browse grid — cover, name, artist,
  chapter/page counts, gap badge; sort recent|name|size; cards → manage/read.
  meta.title adds it to the nav automatically (peer of Posts).
- seriesBrowse store for the list.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/posts/PostCard.vue

@@ -15,6 +15,7 @@
         · {{ totalImages }} image{{ totalImages === 1 ? '' : 's' }}
       </span>
       <v-spacer />
+      <PostSeriesMenu :post="post" />
       <v-btn
         v-if="post.post_url"
         :href="post.post_url" target="_blank" rel="noopener"
@@ -101,6 +102,7 @@ import { useModalStore } from '../../stores/modal.js'
 import { usePostsStore } from '../../stores/posts.js'
 import { toPlainText } from '../../utils/htmlSanitize.js'
 import PostEmptyThumbs from './PostEmptyThumbs.vue'
+import PostSeriesMenu from './PostSeriesMenu.vue'
 
 const props = defineProps({
   post: { type: Object, required: true },

frontend/src/components/posts/PostSeriesMenu.vue

@@ -0,0 +1,123 @@
+<template>
+  <span class="fc-post-series">
+    <v-btn
+      size="x-small" variant="text" prepend-icon="mdi-book-plus-outline"
+      append-icon="mdi-menu-down"
+      :aria-label="`Add post ${post.id} to a series`"
+      @click.stop="menuOpen = !menuOpen"
+    >Series</v-btn>
+    <v-menu v-model="menuOpen" activator="parent" :open-on-click="false">
+      <v-list density="compact">
+        <v-list-item :disabled="busy" @click="onPromote">
+          <template #prepend>
+            <v-icon size="small">mdi-book-plus</v-icon>
+          </template>
+          <v-list-item-title>New series from this post</v-list-item-title>
+        </v-list-item>
+        <v-list-item @click="openPicker">
+          <template #prepend>
+            <v-icon size="small">mdi-playlist-plus</v-icon>
+          </template>
+          <v-list-item-title>Add to existing series…</v-list-item-title>
+        </v-list-item>
+      </v-list>
+    </v-menu>
+
+    <v-dialog v-model="pickerOpen" max-width="460">
+      <v-card>
+        <v-card-title>Add to series</v-card-title>
+        <v-card-text>
+          <p class="text-caption mb-2">
+            Appends this post as the next chapter of the chosen series.
+          </p>
+          <v-autocomplete
+            v-model="picked"
+            :items="hits"
+            :item-title="(s) => s.name"
+            :item-value="(s) => s.id"
+            :loading="searching"
+            label="Series" density="compact" autofocus clearable
+          />
+        </v-card-text>
+        <v-card-actions>
+          <v-spacer />
+          <v-btn @click="pickerOpen = false">Cancel</v-btn>
+          <v-btn
+            color="primary" rounded="pill"
+            :disabled="picked == null || busy" @click="onAddExisting"
+          >Add</v-btn>
+        </v-card-actions>
+      </v-card>
+    </v-dialog>
+  </span>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { useApi } from '../../composables/useApi.js'
+import { toast } from '../../utils/toast.js'
+
+const props = defineProps({ post: { type: Object, required: true } })
+
+const api = useApi()
+const router = useRouter()
+
+const menuOpen = ref(false)
+const busy = ref(false)
+const pickerOpen = ref(false)
+const picked = ref(null)
+const hits = ref([])
+const searching = ref(false)
+
+async function onPromote() {
+  menuOpen.value = false
+  busy.value = true
+  try {
+    const out = await api.post('/api/series/from-post', {
+      body: { post_id: props.post.id }
+    })
+    toast({ text: `Series created: ${out.name}`, type: 'success' })
+    router.push({ name: 'series-manage', params: { tagId: out.series_tag_id } })
+  } catch (e) {
+    toast({ text: `Could not create series: ${e.message}`, type: 'error' })
+  } finally {
+    busy.value = false
+  }
+}
+
+async function openPicker() {
+  menuOpen.value = false
+  picked.value = null
+  hits.value = []
+  pickerOpen.value = true
+  // Load the full series list so the picker is browsable (the tag autocomplete
+  // returns nothing for an empty query — the #712 trap). v-autocomplete filters
+  // client-side by name as the operator types.
+  searching.value = true
+  try {
+    const body = await api.get('/api/series', { params: { sort: 'name' } })
+    hits.value = body.series || []
+  } catch (e) {
+    toast({ text: `Could not load series: ${e.message}`, type: 'error' })
+  } finally {
+    searching.value = false
+  }
+}
+
+async function onAddExisting() {
+  if (picked.value == null) return
+  busy.value = true
+  try {
+    await api.post(`/api/series/${picked.value}/add-post`, {
+      body: { post_id: props.post.id }
+    })
+    pickerOpen.value = false
+    toast({ text: 'Added to series', type: 'success' })
+  } catch (e) {
+    toast({ text: `Could not add to series: ${e.message}`, type: 'error' })
+  } finally {
+    busy.value = false
+  }
+}
+</script>

frontend/src/router.js

@@ -4,6 +4,7 @@ import GalleryView from './views/GalleryView.vue'
 import ShowcaseView from './views/ShowcaseView.vue'
 import TagsView from './views/TagsView.vue'
 import ArtistView from './views/ArtistView.vue'
+import SeriesView from './views/SeriesView.vue'
 import SeriesManageView from './views/SeriesManageView.vue'
 import SeriesReaderView from './views/SeriesReaderView.vue'
 import SubscriptionsView from './views/SubscriptionsView.vue'
@@ -25,7 +26,9 @@ const routes = [
   { path: '/tags',     name: 'tags',     component: TagsView,     meta: { title: 'Tags'     } },
   // Artist detail — no meta.title (reached by clicking an artist, not nav).
   { path: '/artist/:slug', name: 'artist', component: ArtistView },
-  // Series management — no meta.title (reached from a series tag card).
+  // Series browse — a nav entry (meta.title). Peer of Posts.
+  { path: '/series', name: 'series', component: SeriesView, meta: { title: 'Series' } },
+  // Series management — no meta.title (reached from a series card/tag).
   { path: '/series/:tagId', name: 'series-manage', component: SeriesManageView },
   // Series reader — immersive (no top nav, no meta.title).
   { path: '/series/:tagId/read', name: 'series-read', component: SeriesReaderView, meta: { immersive: true } },

frontend/src/stores/seriesBrowse.js

@@ -0,0 +1,31 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { useApi } from '../composables/useApi.js'
+import { useAsyncAction } from '../composables/useAsyncAction.js'
+
+// Backs the Series browse view (FC-6.2). list_series returns every series as a
+// card; homelab scale is small enough to load the whole list and sort/filter
+// server-side.
+export const useSeriesBrowseStore = defineStore('seriesBrowse', () => {
+  const api = useApi()
+  const series = ref([])
+  const sort = ref('recent')
+  const artistId = ref(null)
+  const { loading, error, run } = useAsyncAction({ errorAs: 'message' })
+
+  async function load() {
+    await run(async () => {
+      const params = { sort: sort.value }
+      if (artistId.value != null) params.artist_id = artistId.value
+      const body = await api.get('/api/series', { params })
+      series.value = body.series || []
+    })
+  }
+
+  function setSort(s) {
+    sort.value = s
+    return load()
+  }
+
+  return { series, sort, artistId, loading, error, load, setSort }
+})

frontend/src/views/SeriesView.vue

@@ -0,0 +1,145 @@
+<template>
+  <v-container fluid class="pt-2 pb-6">
+    <div class="fc-series-browse__controls">
+      <v-select
+        :model-value="store.sort"
+        :items="sortItems"
+        density="compact" variant="outlined" hide-details
+        label="Sort" style="max-width: 220px;"
+        @update:model-value="store.setSort($event)"
+      />
+    </div>
+
+    <v-alert v-if="store.error" type="error" variant="tonal" closable class="my-4">
+      Failed to load: {{ store.error }}
+    </v-alert>
+    <div
+      v-else-if="!store.loading && store.series.length === 0"
+      class="fc-series-browse__empty"
+    >
+      No series yet. Make one from a post's “Series ▾ → New series from this post”,
+      or create a <code>series:</code> tag and add images.
+    </div>
+
+    <div class="fc-series-browse__grid">
+      <article
+        v-for="s in store.series" :key="s.id" class="fc-sbcard"
+        @click="manage(s.id)"
+      >
+        <div class="fc-sbcard__cover">
+          <img v-if="s.cover_thumbnail_url" :src="s.cover_thumbnail_url" alt="" loading="lazy" />
+          <div v-else class="fc-sbcard__cover--empty">
+            <v-icon size="large">mdi-book-open-page-variant</v-icon>
+          </div>
+          <span v-if="s.has_gap" class="fc-sbcard__gap" title="Has a missing-page gap">
+            <v-icon size="x-small">mdi-alert-outline</v-icon> gap
+          </span>
+        </div>
+        <div class="fc-sbcard__body">
+          <h3 class="fc-sbcard__name">{{ s.name }}</h3>
+          <div class="fc-sbcard__meta">
+            <span v-if="s.artist_name" class="fc-sbcard__artist">{{ s.artist_name }}</span>
+            <span class="fc-sbcard__counts">
+              {{ s.chapter_count }} ch · {{ s.page_count }} pg
+            </span>
+          </div>
+          <div class="fc-sbcard__actions">
+            <v-btn
+              size="x-small" variant="tonal" color="accent"
+              prepend-icon="mdi-book-open"
+              :disabled="s.page_count === 0"
+              @click.stop="read(s.id)"
+            >Read</v-btn>
+            <v-btn
+              size="x-small" variant="text"
+              prepend-icon="mdi-pencil" @click.stop="manage(s.id)"
+            >Manage</v-btn>
+          </div>
+        </div>
+      </article>
+    </div>
+
+    <div v-if="store.loading" class="fc-series-browse__sentinel">
+      <v-progress-circular indeterminate color="accent" size="28" />
+    </div>
+  </v-container>
+</template>
+
+<script setup>
+import { onMounted } from 'vue'
+import { useRouter } from 'vue-router'
+import { useSeriesBrowseStore } from '../stores/seriesBrowse.js'
+
+const router = useRouter()
+const store = useSeriesBrowseStore()
+
+const sortItems = [
+  { title: 'Recently updated', value: 'recent' },
+  { title: 'Name', value: 'name' },
+  { title: 'Size', value: 'size' }
+]
+
+function manage(id) {
+  router.push({ name: 'series-manage', params: { tagId: id } })
+}
+function read(id) {
+  router.push({ name: 'series-read', params: { tagId: id } })
+}
+
+onMounted(() => store.load())
+</script>
+
+<style scoped>
+.fc-series-browse__controls {
+  display: flex; gap: 12px; margin-bottom: 16px;
+}
+.fc-series-browse__empty {
+  padding: 48px; text-align: center;
+  color: rgb(var(--v-theme-on-surface-variant));
+}
+.fc-series-browse__grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
+  gap: 14px;
+}
+.fc-sbcard {
+  border: 1px solid rgb(var(--v-theme-surface-light));
+  border-radius: 8px; overflow: hidden; cursor: pointer;
+  background: rgb(var(--v-theme-surface));
+  transition: border-color 120ms ease, transform 120ms ease;
+}
+.fc-sbcard:hover {
+  border-color: rgb(var(--v-theme-accent), 0.6);
+  transform: translateY(-2px);
+}
+.fc-sbcard__cover {
+  position: relative; aspect-ratio: 3 / 2; background: rgb(var(--v-theme-surface-light));
+}
+.fc-sbcard__cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
+.fc-sbcard__cover--empty {
+  width: 100%; height: 100%;
+  display: flex; align-items: center; justify-content: center;
+  color: rgb(var(--v-theme-on-surface-variant));
+}
+.fc-sbcard__gap {
+  position: absolute; top: 6px; right: 6px;
+  display: inline-flex; align-items: center; gap: 2px;
+  padding: 1px 6px; border-radius: 999px; font-size: 11px;
+  background: rgba(20, 23, 26, 0.75);
+  color: rgb(var(--v-theme-warning, var(--v-theme-accent)));
+}
+.fc-sbcard__body { padding: 8px 10px; }
+.fc-sbcard__name {
+  font-family: 'Fraunces', Georgia, serif; font-size: 15px; font-weight: 600;
+  margin: 0 0 4px; color: rgb(var(--v-theme-on-surface));
+  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
+}
+.fc-sbcard__meta {
+  display: flex; justify-content: space-between; gap: 8px;
+  font-size: 12px; color: rgb(var(--v-theme-on-surface-variant));
+  margin-bottom: 8px;
+}
+.fc-sbcard__artist { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.fc-sbcard__counts { flex: 0 0 auto; font-variant-numeric: tabular-nums; }
+.fc-sbcard__actions { display: flex; gap: 6px; }
+</style>