Improve hub page: new RouteStepper, HubProductCard with ApexCharts

- Redesign RouteStepper: nodes connected by lines with distance on line
- Add HubProductCard component with sparkline chart background
- Auto-select first product when hub page loads
- Remove placeholder with package-x icon
- Add ApexCharts plugin for charts
- Pass startName/endName to RouteStepper for route visualization

app/components/catalog/HubProductCard.vue

@@ -0,0 +1,112 @@
+<template>
+  <Card
+    padding="md"
+    interactive
+    class="cursor-pointer overflow-hidden min-w-36 shrink-0"
+    :class="{ 'ring-2 ring-primary': selected }"
+    @click="$emit('select')"
+  >
+    <div class="relative min-h-14">
+      <!-- Sparkline chart background -->
+      <div v-if="priceHistory.length > 1" class="absolute inset-0 opacity-15">
+        <ClientOnly>
+          <apexchart
+            type="area"
+            height="56"
+            :options="chartOptions"
+            :series="chartSeries"
+          />
+        </ClientOnly>
+      </div>
+
+      <!-- Content -->
+      <div class="relative z-10">
+        <Text weight="semibold" size="sm" class="mb-1">{{ name }}</Text>
+        <div class="flex items-center gap-2">
+          <Text v-if="currentPrice" size="sm" class="text-primary font-bold">
+            {{ formattedPrice }}
+          </Text>
+          <span
+            v-if="trend !== 0"
+            class="text-xs font-medium"
+            :class="trend > 0 ? 'text-success' : 'text-error'"
+          >
+            {{ trend > 0 ? '↑' : '↓' }} {{ Math.abs(trend) }}%
+          </span>
+        </div>
+      </div>
+    </div>
+  </Card>
+</template>
+
+<script setup lang="ts">
+const props = withDefaults(defineProps<{
+  name: string
+  currentPrice?: number | null
+  currency?: string | null
+  priceHistory?: number[]
+  selected?: boolean
+}>(), {
+  priceHistory: () => [],
+  selected: false
+})
+
+defineEmits<{
+  select: []
+}>()
+
+const formattedPrice = computed(() => {
+  if (!props.currentPrice) return ''
+  const symbol = getCurrencySymbol(props.currency)
+  return `${symbol}${props.currentPrice.toLocaleString()}`
+})
+
+const getCurrencySymbol = (currency?: string | null) => {
+  switch (currency?.toUpperCase()) {
+    case 'USD': return '$'
+    case 'EUR': return '€'
+    case 'RUB': return '₽'
+    case 'CNY': return '¥'
+    default: return '$'
+  }
+}
+
+// Calculate trend from price history
+const trend = computed(() => {
+  if (props.priceHistory.length < 2) return 0
+  const first = props.priceHistory[0]
+  const last = props.priceHistory[props.priceHistory.length - 1]
+  if (!first || first === 0) return 0
+  return Math.round(((last - first) / first) * 100)
+})
+
+// Chart configuration
+const chartOptions = computed(() => ({
+  chart: {
+    type: 'area',
+    sparkline: { enabled: true },
+    animations: { enabled: false }
+  },
+  stroke: {
+    curve: 'smooth',
+    width: 2
+  },
+  fill: {
+    type: 'gradient',
+    gradient: {
+      shadeIntensity: 1,
+      opacityFrom: 0.4,
+      opacityTo: 0.1
+    }
+  },
+  colors: [trend.value >= 0 ? '#22c55e' : '#ef4444'],
+  tooltip: { enabled: false },
+  xaxis: { labels: { show: false } },
+  yaxis: { labels: { show: false } }
+}))
+
+const chartSeries = computed(() => [{
+  name: 'Price',
+  data: props.priceHistory.length > 0 ? props.priceHistory : [0]
+}])
+</script>