feat(artist-view): ArtistGalleryTab — MasonryGrid wired to the artist store's existing loadMoreImages; modal-open preserves ?tab=. No global gallery-store coupling (avoids cross-pollution into /gallery)

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

frontend/src/components/artist/ArtistGalleryTab.vue

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+<template>
+  <div class="fc-artist-gallery">
+    <MasonryGrid
+      :items="store.images"
+      :loading="store.imagesLoading"
+      :has-more="store.hasMoreImages"
+      @load-more="store.loadMoreImages(props.slug)"
+      @open="openImage"
+    />
+  </div>
+</template>
+
+<script setup>
+import { onMounted, watch } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+
+import { useArtistStore } from '../../stores/artist.js'
+import { useModalStore } from '../../stores/modal.js'
+import MasonryGrid from '../discovery/MasonryGrid.vue'
+
+const props = defineProps({
+  slug: { type: String, required: true },
+})
+
+const store = useArtistStore()
+const modal = useModalStore()
+const route = useRoute()
+const router = useRouter()
+
+onMounted(() => {
+  const initial = parseInt(route.query.image, 10)
+  if (!isNaN(initial)) modal.open(initial)
+})
+
+watch(() => route.query.image, (q) => {
+  const id = parseInt(q, 10)
+  if (!isNaN(id) && id !== modal.currentImageId) modal.open(id)
+  else if (isNaN(id) && modal.currentImageId !== null) modal.close()
+})
+
+function openImage (id) {
+  router.push({ query: { ...route.query, image: id } })
+}
+</script>
+
+<style scoped>
+.fc-artist-gallery { min-width: 0; }
+</style>