feat(Timeline): new component (#4215)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>
Co-authored-by: Jakub <jakub.michalek@freelo.io>

docs/app/components/content/examples/timeline/TimelineCustomSlotExample.vue

@@ -0,0 +1,52 @@
+<script setup lang="ts">
+import type { TimelineItem } from '@nuxt/ui'
+
+const items = [{
+  date: 'Mar 15, 2025',
+  title: 'Project Kickoff',
+  subtitle: 'Project Initiation',
+  description: 'Kicked off the project with team alignment. Set up project milestones and allocated resources.',
+  icon: 'i-lucide-rocket',
+  value: 'kickoff'
+}, {
+  date: 'Mar 22, 2025',
+  title: 'Design Phase',
+  description: 'User research and design workshops. Created wireframes and prototypes for user testing.',
+  icon: 'i-lucide-palette',
+  value: 'design'
+}, {
+  date: 'Mar 29, 2025',
+  title: 'Development Sprint',
+  description: 'Frontend and backend development. Implemented core features and integrated with APIs.',
+  icon: 'i-lucide-code',
+  value: 'development',
+  slot: 'development' as const,
+  developers: [
+    {
+      src: 'https://github.com/J-Michalek.png'
+    }, {
+      src: 'https://github.com/benjamincanac.png'
+    }
+  ]
+}, {
+  date: 'Apr 5, 2025',
+  title: 'Testing & Deployment',
+  description: 'QA testing and performance optimization. Deployed the application to production.',
+  icon: 'i-lucide-check-circle',
+  value: 'deployment'
+}] satisfies TimelineItem[]
+</script>
+
+<template>
+  <UTimeline :items="items" :default-value="2" class="w-96">
+    <template #development-title="{ item }">
+      <div class="flex items-center gap-1">
+        <span>{{ item.title }}</span>
+
+        <UAvatarGroup size="2xs">
+          <UAvatar v-for="(developer, index) of item.developers" :key="index" v-bind="developer" />
+        </UAvatarGroup>
+      </div>
+    </template>
+  </UTimeline>
+</template>