feat(fc2b): suggestions store + modal panel components

Store: load per-image suggestions, accept (creates the tag first for
raw/creates_new_tag suggestions, then accepts by id), aliasAccept,
dismiss (client-side hide for raw tags), success toasts folded in.
Panel: people/sources groups always open, General collapsed by default;
alias picker dialog wired; shimmer skeleton while loading. SuggestionItem
shows score %, +new badge for raw tags, kebab menu. AliasPickerDialog
referenced (lands in Task 15).

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

frontend/src/components/modal/SuggestionItem.vue

@@ -0,0 +1,54 @@
+<template>
+  <div class="fc-suggestion">
+    <span class="fc-suggestion__name">
+      {{ suggestion.display_name }}
+      <span v-if="suggestion.creates_new_tag" class="fc-suggestion__new"
+        title="No matching tag yet — accepting creates it">＋new</span>
+    </span>
+    <span class="fc-suggestion__score">{{ scorePct }}</span>
+    <v-btn
+      icon="mdi-plus" size="x-small" variant="text" color="accent"
+      :aria-label="`Accept ${suggestion.display_name}`"
+      @click="$emit('accept', suggestion)"
+    />
+    <v-menu>
+      <template #activator="{ props }">
+        <v-btn icon="mdi-dots-vertical" size="x-small" variant="text" v-bind="props" />
+      </template>
+      <v-list density="compact">
+        <v-list-item @click="$emit('alias', suggestion)">
+          <v-list-item-title>Treat as alias for…</v-list-item-title>
+        </v-list-item>
+        <v-list-item @click="$emit('dismiss', suggestion)">
+          <v-list-item-title>Dismiss for this image</v-list-item-title>
+        </v-list-item>
+      </v-list>
+    </v-menu>
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue'
+
+const props = defineProps({ suggestion: { type: Object, required: true } })
+defineEmits(['accept', 'alias', 'dismiss'])
+
+const scorePct = computed(() => `${Math.round(props.suggestion.score * 100)}%`)
+</script>
+
+<style scoped>
+.fc-suggestion {
+  display: flex; align-items: center; gap: 6px;
+  padding: 2px 0;
+}
+.fc-suggestion__name { flex: 1; min-width: 0; }
+.fc-suggestion__new {
+  font-size: 10px; color: rgb(var(--v-theme-accent));
+  margin-left: 4px;
+}
+.fc-suggestion__score {
+  font-size: 11px;
+  color: rgb(var(--v-theme-on-surface-variant, var(--v-theme-on-surface)));
+  font-family: 'JetBrains Mono', monospace;
+}
+</style>