feat(gallery): "Show hidden" toggle reveals presentation chrome (#141 step 2)

A Curation-group chip in the facet panel flips include_hidden, threaded through
the gallery filter store (default model, activeFilterParam, applyFilterFromQuery,
cloneFilter, filterToQuery) and counted in the refine badge. Off by default → the
gallery hides banner/editor-screenshot chrome; on → it's revealed. Backend
already honors include_hidden (step 1). The dedicated conflict-flagged review
surface (only the set-aside items) lands in step 5.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

frontend/src/components/gallery/GalleryFacetPanel.vue

@@ -34,6 +34,15 @@
           :color="store.filter.no_artist ? 'accent' : undefined"
           @click="toggleFlag('no_artist')"
         >No artist<span class="fc-facets__count">{{ facetCount('no_artist') }}</span></v-chip>
+        <!-- Reveal presentation chrome (banner / editor screenshot) the gallery
+             hides by default (milestone 141). A browse-mode toggle, not a count. -->
+        <v-chip
+          size="small" label
+          :variant="store.filter.include_hidden ? 'flat' : 'tonal'"
+          :color="store.filter.include_hidden ? 'accent' : undefined"
+          title="Show hidden — reveal banners / editor screenshots the gallery sets aside by default"
+          @click="toggleFlag('include_hidden')"
+        >Show hidden</v-chip>
       </div>
     </div>
 

frontend/src/components/gallery/GalleryFilterBar.vue

@@ -160,7 +160,7 @@ let debounce = null
 const refineCount = computed(() => {
   const f = store.filter
   return (f.platform ? 1 : 0) + (f.untagged ? 1 : 0) + (f.no_artist ? 1 : 0)
-    + (f.date_from ? 1 : 0) + (f.date_to ? 1 : 0)
+    + (f.include_hidden ? 1 : 0) + (f.date_from ? 1 : 0) + (f.date_to ? 1 : 0)
 })
 const hasRefineFilters = computed(() => refineCount.value > 0)
 

frontend/src/stores/gallery.js

@@ -30,6 +30,9 @@ export const useGalleryStore = defineStore('gallery', () => {
     tag_or: [], tag_exclude: [],
     // Phase-2 faceted refine params.
     platform: null, untagged: false, no_artist: false,
+    // Reveal the presentation chrome (banner / editor screenshot) the gallery
+    // hides by default (milestone 141).
+    include_hidden: false,
     date_from: null, date_to: null,
     // Phase-3 visual similarity: when set, the gallery is in "similar mode" —
     // ranked by cosine distance to this image, bounded top-N, no cursor.
@@ -158,6 +161,7 @@ export const useGalleryStore = defineStore('gallery', () => {
     if (filter.value.platform) p.platform = filter.value.platform
     if (filter.value.untagged) p.untagged = '1'
     if (filter.value.no_artist) p.no_artist = '1'
+    if (filter.value.include_hidden) p.include_hidden = '1'
     if (filter.value.date_from) p.date_from = filter.value.date_from
     if (filter.value.date_to) p.date_to = filter.value.date_to
     return p
@@ -196,6 +200,7 @@ export const useGalleryStore = defineStore('gallery', () => {
       platform: q.platform || null,
       untagged: _truthy(q.untagged),
       no_artist: _truthy(q.no_artist),
+      include_hidden: _truthy(q.include_hidden),
       date_from: _parseDate(q.date_from),
       date_to: _parseDate(q.date_to),
       similar_to: _toId(q.similar_to),
@@ -284,7 +289,8 @@ export function cloneFilter(f) {
     tag_exclude: [...(f.tag_exclude || [])],
     artist_id: f.artist_id, media_type: f.media_type,
     sort: f.sort, platform: f.platform, untagged: f.untagged,
-    no_artist: f.no_artist, date_from: f.date_from, date_to: f.date_to,
+    no_artist: f.no_artist, include_hidden: f.include_hidden,
+    date_from: f.date_from, date_to: f.date_to,
     similar_to: f.similar_to,
   }
 }
@@ -301,6 +307,7 @@ export function filterToQuery(f) {
   if (f.platform) q.platform = f.platform
   if (f.untagged) q.untagged = '1'
   if (f.no_artist) q.no_artist = '1'
+  if (f.include_hidden) q.include_hidden = '1'
   if (f.date_from) q.date_from = f.date_from
   if (f.date_to) q.date_to = f.date_to
   if (f.similar_to) q.similar_to = String(f.similar_to)