feat(fc2c-i): pinia stores for showcase, tag directory, artist

frontend/src/stores/showcase.js

@@ -0,0 +1,45 @@
+import { defineStore } from 'pinia'
+import { ref, computed } from 'vue'
+import { useApi } from '../composables/useApi.js'
+
+const PAGE = 60
+
+export const useShowcaseStore = defineStore('showcase', () => {
+  const api = useApi()
+  const images = ref([])
+  const loading = ref(false)
+  const error = ref(null)
+  const exhausted = ref(false)
+  const seen = new Set()
+
+  async function fetchPage() {
+    if (loading.value) return
+    loading.value = true
+    error.value = null
+    try {
+      const body = await api.get('/api/showcase', { params: { limit: PAGE } })
+      const fresh = body.images.filter(i => !seen.has(i.id))
+      if (fresh.length === 0) { exhausted.value = true; return }
+      for (const i of fresh) seen.add(i.id)
+      images.value.push(...fresh)
+    } catch (e) {
+      error.value = e.message
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function shuffle() {
+    images.value = []
+    seen.clear()
+    exhausted.value = false
+    await fetchPage()
+  }
+
+  const hasMore = computed(() => !exhausted.value)
+  const isEmpty = computed(
+    () => !loading.value && images.value.length === 0 && error.value === null
+  )
+
+  return { images, loading, error, hasMore, isEmpty, fetchPage, shuffle }
+})