Multiple changes

- backend: add summoner spells
- backend: add build variants
- backend: builds are now storing full tree with runes (keystones)
- backend: build trees are split on starter items and merged on runes
- frontend: computing core tree now
- frontend: variant selectors

frontend/components/SummonerSpells.vue

@@ -0,0 +1,76 @@
+<script setup lang="ts">
+import { CDRAGON_BASE, mapPath } from '~/utils/cdragon'
+
+const { summonerSpellMap } = useSummonerSpellMap()
+
+defineProps<{
+  summonerSpells: Array<{ id: number; count: number; pickrate: number }>
+}>()
+</script>
+
+<template>
+  <div class="summoner-spells-section">
+    <div class="summoner-spells-row">
+      <div v-for="(spell, i) in summonerSpells" :key="i" class="summoner-spell-item">
+        <NuxtImg
+          v-if="summonerSpellMap.get(spell.id)"
+          class="summoner-spell-img"
+          :src="CDRAGON_BASE + mapPath(summonerSpellMap.get(spell.id)!.iconPath)"
+        />
+        <div v-else class="summoner-spell-placeholder" />
+        <span class="spell-pickrate">{{ (spell.pickrate * 100).toFixed(0) }}%</span>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.summoner-spells-section {
+  display: flex;
+  flex-direction: row;
+}
+
+.summoner-spells-row {
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  gap: 8px;
+}
+
+.summoner-spell-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 2px;
+}
+
+.summoner-spell-img {
+  width: 36px;
+  height: 36px;
+  border-radius: 4px;
+  border: 1px solid var(--color-on-surface);
+}
+
+.summoner-spell-placeholder {
+  width: 36px;
+  height: 36px;
+  background: var(--color-surface);
+  border-radius: 4px;
+  border: 1px solid var(--color-on-surface);
+}
+
+.spell-pickrate {
+  font-size: 0.65rem;
+  color: var(--color-on-surface);
+  opacity: 0.7;
+}
+
+/* Responsive: Mobile */
+@media only screen and (max-width: 900px) {
+  .summoner-spell-img,
+  .summoner-spell-placeholder {
+    width: 32px;
+    height: 32px;
+  }
+}
+</style>