Initial commit: DNS Test - DNS health checking tool

Go backend (miekg/dns) + Nuxt 3 frontend (Tailwind CSS v4).

8 check categories, 52 checks total:
- Overview: @ record, WWW, MX with ASN/provider lookup
- Domain Registration: expiry, registrar (RDAP + whois fallback)
- Parent Delegation: NS records, glue, consistency
- Nameservers: 17 checks (reachability, auth, recursion, TCP/UDP, AXFR, etc.)
- SOA: serial consistency, timing values
- Mail (MX): 11 checks (CNAME, PTR, public IPs, consistency)
- Mail Auth: SPF, DKIM, DMARC
- WWW: A record, CNAME

Features:
- SSE streaming (results appear as each category completes)
- SQLite history (modernc.org/sqlite)
- Rate limiting, CORS, request logging
- Dark mode, responsive design

frontend/app/components/SummaryBar.vue

@@ -0,0 +1,104 @@
+<template>
+  <div class="rounded-xl border border-gray-200 bg-white p-5 dark:border-gray-800 dark:bg-gray-900">
+    <div class="mb-3 flex items-center justify-between">
+      <h2 class="text-sm font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400">Summary</h2>
+      <div class="flex items-center gap-2">
+        <button
+          v-if="activeFilter"
+          @click="emit('filter', null)"
+          class="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300"
+        >
+          Show all
+        </button>
+        <span class="text-sm text-gray-500 dark:text-gray-400">{{ total }} checks</span>
+      </div>
+    </div>
+
+    <!-- Bar -->
+    <div class="mb-4 flex h-3 overflow-hidden rounded-full bg-gray-100 dark:bg-gray-800" v-if="total > 0">
+      <div
+        v-if="summary.pass > 0"
+        class="bg-green-500 cursor-pointer transition-all hover:brightness-110"
+        :style="{ width: pct(summary.pass) }"
+        @click="emit('filter', 'pass')"
+      ></div>
+      <div
+        v-if="summary.info > 0"
+        class="bg-blue-500 cursor-pointer transition-all hover:brightness-110"
+        :style="{ width: pct(summary.info) }"
+        @click="emit('filter', 'info')"
+      ></div>
+      <div
+        v-if="summary.warn > 0"
+        class="bg-yellow-500 cursor-pointer transition-all hover:brightness-110"
+        :style="{ width: pct(summary.warn) }"
+        @click="emit('filter', 'warn')"
+      ></div>
+      <div
+        v-if="summary.fail > 0"
+        class="bg-red-500 cursor-pointer transition-all hover:brightness-110"
+        :style="{ width: pct(summary.fail) }"
+        @click="emit('filter', 'fail')"
+      ></div>
+    </div>
+
+    <!-- Counts (clickable) -->
+    <div class="flex flex-wrap gap-4 text-sm">
+      <button
+        v-if="summary.fail > 0"
+        @click="emit('filter', activeFilter === 'fail' ? null : 'fail')"
+        class="flex items-center gap-1.5 rounded-md px-2 py-0.5 transition"
+        :class="activeFilter === 'fail' ? 'bg-red-100 dark:bg-red-900/30' : 'hover:bg-gray-100 dark:hover:bg-gray-800'"
+      >
+        <span class="inline-block h-3 w-3 rounded-full bg-red-500"></span>
+        <span class="font-medium text-gray-700 dark:text-gray-300">{{ summary.fail }} failed</span>
+      </button>
+      <button
+        v-if="summary.warn > 0"
+        @click="emit('filter', activeFilter === 'warn' ? null : 'warn')"
+        class="flex items-center gap-1.5 rounded-md px-2 py-0.5 transition"
+        :class="activeFilter === 'warn' ? 'bg-yellow-100 dark:bg-yellow-900/30' : 'hover:bg-gray-100 dark:hover:bg-gray-800'"
+      >
+        <span class="inline-block h-3 w-3 rounded-full bg-yellow-500"></span>
+        <span class="font-medium text-gray-700 dark:text-gray-300">{{ summary.warn }} warnings</span>
+      </button>
+      <button
+        @click="emit('filter', activeFilter === 'pass' ? null : 'pass')"
+        class="flex items-center gap-1.5 rounded-md px-2 py-0.5 transition"
+        :class="activeFilter === 'pass' ? 'bg-green-100 dark:bg-green-900/30' : 'hover:bg-gray-100 dark:hover:bg-gray-800'"
+      >
+        <span class="inline-block h-3 w-3 rounded-full bg-green-500"></span>
+        <span class="font-medium text-gray-700 dark:text-gray-300">{{ summary.pass }} passed</span>
+      </button>
+      <button
+        v-if="summary.info > 0"
+        @click="emit('filter', activeFilter === 'info' ? null : 'info')"
+        class="flex items-center gap-1.5 rounded-md px-2 py-0.5 transition"
+        :class="activeFilter === 'info' ? 'bg-blue-100 dark:bg-blue-900/30' : 'hover:bg-gray-100 dark:hover:bg-gray-800'"
+      >
+        <span class="inline-block h-3 w-3 rounded-full bg-blue-500"></span>
+        <span class="font-medium text-gray-700 dark:text-gray-300">{{ summary.info }} info</span>
+      </button>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import type { Summary, CheckStatus } from '~/types/dns'
+
+const props = defineProps<{
+  summary: Summary
+  activeFilter?: CheckStatus | null
+}>()
+
+const emit = defineEmits<{
+  filter: [status: CheckStatus | null]
+}>()
+
+const total = computed(() => props.summary.pass + props.summary.warn + props.summary.fail + props.summary.info)
+
+function pct(count: number): string {
+  if (total.value === 0) return '0%'
+  return `${(count / total.value * 100).toFixed(1)}%`
+}
+</script>