feat(theme): implement dynamic theme logo with reactive color updates

docs/.vitepress/theme/components/ThemeLogo.vue

@@ -0,0 +1,64 @@
+<script setup lang="ts">
+import { ref, onMounted, onUnmounted } from 'vue'
+
+const dotColor = ref('var(--vp-c-primary)')
+
+function updateDotColor() {
+  if (typeof document === 'undefined') return
+
+  const root = document.documentElement
+  const style = getComputedStyle(root)
+  const primaryColor = style.getPropertyValue('--vp-c-primary').trim()
+  dotColor.value = primaryColor || 'currentColor'
+}
+
+let observer: MutationObserver | null = null
+
+onMounted(() => {
+  updateDotColor()
+
+  // Watch for theme changes via MutationObserver
+  observer = new MutationObserver(() => {
+    updateDotColor()
+  })
+
+  observer.observe(document.documentElement, {
+    attributes: true,
+    attributeFilter: ['data-theme', 'class'],
+  })
+})
+
+onUnmounted(() => {
+  observer?.disconnect()
+})
+</script>
+
+<template>
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    viewBox="0 0 24 24"
+    fill="none"
+    class="theme-logo"
+    aria-label="Claude Code Workflow"
+  >
+    <!-- Three horizontal lines - use currentColor to inherit from text -->
+    <line x1="3" y1="6" x2="18" y2="6" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>
+    <line x1="3" y1="12" x2="15" y2="12" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>
+    <line x1="3" y1="18" x2="12" y2="18" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>
+    <!-- Status dot - follows theme primary color -->
+    <circle cx="19" cy="17" r="3" :style="{ fill: dotColor }"/>
+  </svg>
+</template>
+
+<style scoped>
+.theme-logo {
+  width: 24px;
+  height: 24px;
+  color: var(--vp-c-text-1);
+}
+
+.theme-logo circle {
+  fill: var(--vp-c-primary);
+  transition: fill 0.3s ease;
+}
+</style>