minor: new nav system (#5)

Co-authored-by: Madison Grubb <madison@elastiflow.com>
Reviewed-on: #5

app/components/UserMenu.vue

@@ -0,0 +1,84 @@
+<template>
+  <AppDropdown
+    :open="open"
+    @close="open = false"
+  >
+    <button
+      type="button"
+      class="flex rounded-full border border-kestrel-border bg-kestrel-surface p-0.5 transition-colors hover:bg-kestrel-border hover:border-kestrel-accent"
+      aria-label="User menu"
+      :aria-expanded="open"
+      aria-haspopup="true"
+      @click="open = !open"
+    >
+      <img
+        v-if="user?.avatar_url"
+        :src="user.avatar_url"
+        :alt="user.identifier"
+        class="h-8 w-8 rounded-full object-cover"
+      >
+      <span
+        v-else
+        class="flex h-8 w-8 items-center justify-center rounded-full bg-kestrel-border text-xs font-medium text-kestrel-text"
+      >
+        {{ initials }}
+      </span>
+    </button>
+    <template #menu>
+      <NuxtLink
+        to="/account"
+        class="kestrel-context-menu-item"
+        role="menuitem"
+        @click="open = false"
+      >
+        Profile
+      </NuxtLink>
+      <NuxtLink
+        to="/settings"
+        class="kestrel-context-menu-item"
+        role="menuitem"
+        @click="open = false"
+      >
+        Settings
+      </NuxtLink>
+      <button
+        type="button"
+        class="kestrel-context-menu-item-danger w-full"
+        role="menuitem"
+        @click="onSignOut"
+      >
+        Sign out
+      </button>
+    </template>
+  </AppDropdown>
+</template>
+
+<script setup>
+const props = defineProps({
+  user: {
+    type: Object,
+    default: null,
+  },
+})
+
+const emit = defineEmits(['signout'])
+
+const open = ref(false)
+
+const initials = computed(() => {
+  const id = props.user?.identifier ?? ''
+  const parts = id.trim().split(/\s+/)
+  if (parts.length >= 2) return (parts[0][0] + parts[1][0]).toUpperCase()
+  return id.slice(0, 2).toUpperCase() || '?'
+})
+
+function onSignOut() {
+  open.value = false
+  emit('signout')
+}
+
+const route = useRoute()
+watch(() => route.path, () => {
+  open.value = false
+})
+</script>