feat(explore): Explore view + tag-gap closing + modal meta/download (#94b–d, #4a/b)
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Cluster C frontend, milestone #94.

#94b Explore walk: new /explore/:imageId route + ExploreView + explore store.
Anchor (reuse /api/gallery/image), neighbour grid (reuse /api/gallery/similar,
24), click a neighbour to re-anchor; in-memory breadcrumb that trims on
backtrack (route is the source of truth). Empty/loading/error + no-embedding
states.

#94c tag-gap closing: components/explore/TagGapPanel — fetches
/api/images/cluster/tag-gaps for the anchor+neighbours, a consensus-threshold
slider (default 60%), per gap shows present/total + the missing thumbnails +
'Apply to N missing' → /api/tags/images/bulk/tags (source manual) → re-fetch.

#94d entry points: 'Explore' button in the modal RelatedStrip; the TopNav entry
comes free from the route's meta.title.

#4a metadata HUD + #4b split Download: new modal ImageMetaBar (always-on, above
ProvenancePanel) shows dimensions/size/type and a split Download button
(default Download, chevron → Copy link via utils/clipboard — no clipboard-image,
rule 95).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XCUHUGQLrBrkgyk1t49kpX
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<template>
<v-container fluid class="pt-2 pb-8 fc-explore">
<!-- Empty state: no anchor (the bare /explore nav entry). -->
<div v-if="!anchorId" class="fc-explore__empty">
<v-icon size="48" color="accent">mdi-compass-outline</v-icon>
<h2 class="fc-explore__empty-title">Explore by visual similarity</h2>
<p class="fc-explore__empty-body">
Open any image and choose <strong>Explore similar</strong>, or pick one
from the gallery to start walking its visual neighbours and closing
tag-coverage gaps across the cluster.
</p>
<v-btn color="accent" variant="flat" rounded="pill" :to="{ name: 'gallery' }">
Browse the gallery
</v-btn>
</div>
<template v-else>
<!-- Breadcrumb of the walked path. -->
<nav v-if="store.breadcrumb.length > 1" class="fc-explore__trail" aria-label="Explore path">
<button
v-for="(c, i) in store.breadcrumb" :key="c.id"
class="fc-explore__crumb"
:class="{ 'fc-explore__crumb--current': i === store.breadcrumb.length - 1 }"
type="button"
:aria-current="i === store.breadcrumb.length - 1 ? 'page' : undefined"
:title="`Step ${i + 1}`"
@click="goTo(c.id)"
>
<img :src="c.thumbnail_url" alt="" loading="lazy" />
</button>
</nav>
<v-alert v-if="store.error" type="error" variant="tonal" class="my-4">
Failed to load: {{ store.error }}
</v-alert>
<div class="fc-explore__layout">
<div class="fc-explore__main">
<!-- Anchor -->
<section v-if="store.anchor" class="fc-explore__anchor">
<img
:src="store.anchor.thumbnail_url" :alt="`Anchor image ${store.anchor.id}`"
class="fc-explore__anchor-img"
/>
<div class="fc-explore__anchor-meta">
<div class="fc-explore__anchor-title">
{{ store.anchor.artist?.name || 'Unknown artist' }}
</div>
<div class="fc-explore__chips">
<v-chip
v-for="t in store.anchor.tags || []" :key="t.id"
size="x-small" variant="tonal" :color="tagStore.colorFor(t.kind)"
>{{ t.name }}</v-chip>
<span v-if="!store.anchor.tags?.length" class="fc-muted text-caption">No tags yet.</span>
</div>
<v-btn
size="small" variant="text" color="accent"
prepend-icon="mdi-image-outline" @click="openInViewer(store.anchor.id)"
>Open in viewer</v-btn>
</div>
</section>
<!-- Neighbour grid -->
<h3 class="fc-explore__section-title">
Visual neighbours
<span v-if="store.neighbors.length" class="fc-muted">({{ store.neighbors.length }})</span>
</h3>
<div v-if="store.loading && !store.neighbors.length" class="fc-explore__grid">
<div v-for="n in 12" :key="n" class="fc-explore__skel" />
</div>
<div
v-else-if="store.anchor && !store.anchor.has_embedding"
class="fc-explore__note fc-muted"
>
This image has no visual embedding yet (videos and not-yet-processed
images), so there are no neighbours to walk.
</div>
<div v-else-if="!store.neighbors.length" class="fc-explore__note fc-muted">
No visual neighbours found.
</div>
<div v-else class="fc-explore__grid">
<button
v-for="img in store.neighbors" :key="img.id"
class="fc-explore__tile" type="button"
:title="`Walk to image ${img.id}`"
@click="goTo(img.id)"
>
<img :src="img.thumbnail_url" :alt="`Neighbour ${img.id}`" loading="lazy" />
</button>
</div>
</div>
<!-- Right rail: cluster tag-gap closing (#94c). -->
<aside class="fc-explore__rail">
<TagGapPanel />
</aside>
</div>
</template>
</v-container>
</template>
<script setup>
import { computed, watch } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { useExploreStore } from '../stores/explore.js'
import { useTagStore } from '../stores/tags.js'
import { useModalStore } from '../stores/modal.js'
import TagGapPanel from '../components/explore/TagGapPanel.vue'
const route = useRoute()
const router = useRouter()
const store = useExploreStore()
const tagStore = useTagStore()
const modal = useModalStore()
const anchorId = computed(() => route.params.imageId || null)
// The route is the source of truth — anchor on whatever the URL says, on mount
// and on every param change (forward walk + breadcrumb backtrack both push the
// route). Reset the walk when we leave the anchored state entirely.
watch(
anchorId,
(id) => { if (id) store.anchorOn(id); else store.reset() },
{ immediate: true },
)
function goTo (id) {
if (Number(id) === Number(anchorId.value)) return
router.push({ name: 'explore', params: { imageId: String(id) } })
}
function openInViewer (id) { modal.open(id) }
</script>
<style scoped>
.fc-muted { color: rgb(var(--v-theme-on-surface-variant)); }
.fc-explore__empty {
max-width: 520px; margin: 64px auto; text-align: center;
display: flex; flex-direction: column; align-items: center; gap: 14px;
}
.fc-explore__empty-title { font-family: 'Fraunces', Georgia, serif; font-weight: 500; }
.fc-explore__empty-body { color: rgb(var(--v-theme-on-surface-variant)); }
.fc-explore__trail {
display: flex; gap: 6px; align-items: center; flex-wrap: wrap;
padding: 4px 0 12px;
}
.fc-explore__crumb {
width: 44px; height: 44px; border-radius: 8px; overflow: hidden;
border: 2px solid transparent; cursor: pointer; padding: 0;
background: rgb(var(--v-theme-surface-light)); flex: 0 0 auto;
}
.fc-explore__crumb img { width: 100%; height: 100%; object-fit: cover; }
.fc-explore__crumb--current { border-color: rgb(var(--v-theme-accent)); }
.fc-explore__crumb:focus-visible { outline: 2px solid rgb(var(--v-theme-accent)); outline-offset: 1px; }
.fc-explore__layout { display: flex; gap: 20px; align-items: flex-start; }
.fc-explore__main { flex: 1 1 auto; min-width: 0; }
.fc-explore__rail { flex: 0 0 320px; position: sticky; top: 80px; }
@media (max-width: 960px) {
.fc-explore__layout { flex-direction: column; }
.fc-explore__rail { flex-basis: auto; width: 100%; position: static; }
}
.fc-explore__anchor {
display: flex; gap: 16px; margin-bottom: 20px;
padding: 12px; border-radius: 12px;
background: rgba(var(--v-theme-on-surface), 0.03);
border: 1px solid rgba(var(--v-theme-on-surface), 0.10);
}
.fc-explore__anchor-img {
width: 160px; height: 160px; object-fit: cover; border-radius: 8px;
background: rgb(var(--v-theme-surface-light)); flex: 0 0 auto;
}
.fc-explore__anchor-meta { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.fc-explore__anchor-title { font-weight: 600; }
.fc-explore__chips { display: flex; flex-wrap: wrap; gap: 4px; }
.fc-explore__section-title {
font-size: 14px; font-weight: 600; margin: 4px 0 10px;
}
.fc-explore__grid {
display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
gap: 8px;
}
.fc-explore__tile {
aspect-ratio: 1; border-radius: 8px; overflow: hidden; padding: 0;
border: 2px solid transparent; cursor: pointer;
background: rgb(var(--v-theme-surface-light));
}
.fc-explore__tile img { width: 100%; height: 100%; object-fit: cover; display: block; }
.fc-explore__tile:hover { border-color: rgba(var(--v-theme-accent), 0.6); }
.fc-explore__tile:focus-visible { outline: 2px solid rgb(var(--v-theme-accent)); outline-offset: 1px; }
.fc-explore__skel {
aspect-ratio: 1; border-radius: 8px;
background: rgb(var(--v-theme-surface-light)); animation: fc-pulse 1.4s ease-in-out infinite;
}
.fc-explore__note { padding: 24px 0; }
@keyframes fc-pulse { 0%, 100% { opacity: 0.5; } 50% { opacity: 0.9; } }
</style>