feat: add inbound webmentions to interactions page

- Add tabbed interface: "My Activity" (outbound) and "Received" (inbound)
- Fetch webmentions from webmention.io API client-side for real-time data
- Filter by type: likes, reposts, replies, mentions
- Show author avatar, action type badge, date, and target post
- Load more pagination for large webmention sets
- Default to inbound tab to highlight interactions from others

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

interactions.njk

@@ -5,10 +5,35 @@ permalink: /interactions/
 ---
 <div class="page-header mb-6 sm:mb-8">
   <h1 class="text-2xl sm:text-3xl font-bold text-surface-900 dark:text-surface-100 mb-2">Interactions</h1>
-  <p class="text-surface-600 dark:text-surface-400">My engagement with content across the IndieWeb.</p>
+  <p class="text-surface-600 dark:text-surface-400">Activity across the IndieWeb - both my engagement and responses to my content.</p>
 </div>
 
-<div class="grid gap-4 sm:gap-6 md:grid-cols-2 lg:grid-cols-3">
+{# Tab navigation for Outbound/Inbound #}
+<div x-data="interactionsApp()" x-init="init()">
+  {# Tab buttons #}
+  <div class="flex border-b border-surface-200 dark:border-surface-700 mb-6">
+    <button
+      @click="activeTab = 'outbound'"
+      :class="activeTab === 'outbound' ? 'border-primary-500 text-primary-600 dark:text-primary-400' : 'border-transparent text-surface-500 hover:text-surface-700 dark:hover:text-surface-300'"
+      class="px-4 py-3 text-sm font-medium border-b-2 -mb-px transition-colors">
+      My Activity
+      <span class="ml-1 text-xs text-surface-400">(outbound)</span>
+    </button>
+    <button
+      @click="activeTab = 'inbound'"
+      :class="activeTab === 'inbound' ? 'border-primary-500 text-primary-600 dark:text-primary-400' : 'border-transparent text-surface-500 hover:text-surface-700 dark:hover:text-surface-300'"
+      class="px-4 py-3 text-sm font-medium border-b-2 -mb-px transition-colors">
+      Received
+      <span class="ml-1 text-xs text-surface-400">(inbound)</span>
+      <span x-show="totalInbound > 0" x-text="totalInbound" class="ml-1 px-1.5 py-0.5 text-xs bg-primary-100 dark:bg-primary-900 text-primary-700 dark:text-primary-300 rounded-full"></span>
+    </button>
+  </div>
+
+  {# ===== OUTBOUND TAB - My Activity ===== #}
+  <div x-show="activeTab === 'outbound'" x-transition>
+    <p class="text-surface-600 dark:text-surface-400 text-sm mb-6">Content I've interacted with across the web.</p>
+
+    <div class="grid gap-4 sm:gap-6 md:grid-cols-2 lg:grid-cols-3">
       {# Likes #}
       <a href="/likes/" class="block p-6 bg-surface-100 dark:bg-surface-800 rounded-lg hover:bg-surface-200 dark:hover:bg-surface-700 transition-colors group">
         <div class="flex items-center gap-4 mb-4">
@@ -88,9 +113,9 @@ permalink: /interactions/
         </div>
         <p class="text-surface-600 dark:text-surface-400 text-sm">Photo posts and images.</p>
       </a>
-</div>
+    </div>
 
-<div class="mt-12 p-6 bg-primary-50 dark:bg-primary-900/20 rounded-lg">
+    <div class="mt-12 p-6 bg-primary-50 dark:bg-primary-900/20 rounded-lg">
       <h2 class="text-lg font-semibold text-surface-900 dark:text-surface-100 mb-2">About IndieWeb Interactions</h2>
       <p class="text-surface-600 dark:text-surface-400 text-sm mb-4">
         These pages show different types of IndieWeb interactions I've made. Each type uses specific microformat properties
@@ -102,4 +127,268 @@ permalink: /interactions/
         <li><strong>Bookmarks</strong> use <code class="bg-surface-200 dark:bg-surface-700 px-1 rounded">u-bookmark-of</code></li>
         <li><strong>Reposts</strong> use <code class="bg-surface-200 dark:bg-surface-700 px-1 rounded">u-repost-of</code></li>
       </ul>
+    </div>
+  </div>
+
+  {# ===== INBOUND TAB - Received Webmentions ===== #}
+  <div x-show="activeTab === 'inbound'" x-transition>
+    <div class="flex items-center justify-between mb-6">
+      <p class="text-surface-600 dark:text-surface-400 text-sm">Webmentions and interactions others have made with my content.</p>
+      <button
+        @click="fetchWebmentions()"
+        :disabled="loading"
+        class="inline-flex items-center gap-2 px-3 py-1.5 text-sm bg-surface-100 dark:bg-surface-800 hover:bg-surface-200 dark:hover:bg-surface-700 rounded-lg transition-colors disabled:opacity-50">
+        <svg class="w-4 h-4" :class="loading ? 'animate-spin' : ''" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"/>
+        </svg>
+        <span x-text="loading ? 'Loading...' : 'Refresh'"></span>
+      </button>
+    </div>
+
+    {# Loading state #}
+    <div x-show="loading && !webmentions.length" class="text-center py-12">
+      <div class="inline-block animate-spin rounded-full h-8 w-8 border-b-2 border-primary-500"></div>
+      <p class="mt-4 text-surface-500">Loading webmentions...</p>
+    </div>
+
+    {# Error state #}
+    <div x-show="error" class="p-4 bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 rounded-lg text-red-700 dark:text-red-300 mb-6">
+      <p x-text="error"></p>
+    </div>
+
+    {# Filter by type #}
+    <div x-show="!loading || webmentions.length" class="flex flex-wrap gap-2 mb-6">
+      <button
+        @click="filterType = 'all'"
+        :class="filterType === 'all' ? 'bg-primary-500 text-white' : 'bg-surface-100 dark:bg-surface-800 text-surface-700 dark:text-surface-300'"
+        class="px-3 py-1.5 text-sm rounded-full transition-colors">
+        All <span x-text="'(' + totalInbound + ')'" class="text-xs opacity-75"></span>
+      </button>
+      <button
+        @click="filterType = 'like-of'"
+        :class="filterType === 'like-of' ? 'bg-red-500 text-white' : 'bg-surface-100 dark:bg-surface-800 text-surface-700 dark:text-surface-300'"
+        class="px-3 py-1.5 text-sm rounded-full transition-colors">
+        ❤️ Likes <span x-text="'(' + likes.length + ')'" class="text-xs opacity-75"></span>
+      </button>
+      <button
+        @click="filterType = 'repost-of'"
+        :class="filterType === 'repost-of' ? 'bg-green-500 text-white' : 'bg-surface-100 dark:bg-surface-800 text-surface-700 dark:text-surface-300'"
+        class="px-3 py-1.5 text-sm rounded-full transition-colors">
+        🔄 Reposts <span x-text="'(' + reposts.length + ')'" class="text-xs opacity-75"></span>
+      </button>
+      <button
+        @click="filterType = 'in-reply-to'"
+        :class="filterType === 'in-reply-to' ? 'bg-primary-500 text-white' : 'bg-surface-100 dark:bg-surface-800 text-surface-700 dark:text-surface-300'"
+        class="px-3 py-1.5 text-sm rounded-full transition-colors">
+        💬 Replies <span x-text="'(' + replies.length + ')'" class="text-xs opacity-75"></span>
+      </button>
+      <button
+        @click="filterType = 'mention-of'"
+        :class="filterType === 'mention-of' ? 'bg-yellow-500 text-white' : 'bg-surface-100 dark:bg-surface-800 text-surface-700 dark:text-surface-300'"
+        class="px-3 py-1.5 text-sm rounded-full transition-colors">
+        📣 Mentions <span x-text="'(' + mentions.length + ')'" class="text-xs opacity-75"></span>
+      </button>
+    </div>
+
+    {# Webmentions list #}
+    <div x-show="!loading || webmentions.length" class="space-y-4">
+      <template x-for="wm in filteredWebmentions" :key="wm['wm-id']">
+        <div class="p-4 bg-surface-100 dark:bg-surface-800 rounded-lg">
+          <div class="flex gap-3">
+            {# Author avatar #}
+            <a :href="wm.author?.url || '#'" target="_blank" rel="noopener" class="flex-shrink-0">
+              <img
+                :src="wm.author?.photo || '/images/default-avatar.png'"
+                :alt="wm.author?.name || 'Anonymous'"
+                class="w-10 h-10 rounded-full"
+                loading="lazy"
+                onerror="this.src='/images/default-avatar.png'"
+              >
+            </a>
+
+            <div class="flex-1 min-w-0">
+              {# Header with author, type badge, and date #}
+              <div class="flex flex-wrap items-center gap-2 mb-1">
+                <a :href="wm.author?.url || '#'" target="_blank" rel="noopener" class="font-semibold text-surface-900 dark:text-surface-100 hover:underline" x-text="wm.author?.name || 'Anonymous'"></a>
+
+                {# Type badge #}
+                <span x-show="wm['wm-property'] === 'like-of'" class="inline-flex items-center gap-1 px-2 py-0.5 text-xs bg-red-100 dark:bg-red-900/30 text-red-700 dark:text-red-300 rounded-full">
+                  ❤️ liked
+                </span>
+                <span x-show="wm['wm-property'] === 'repost-of'" class="inline-flex items-center gap-1 px-2 py-0.5 text-xs bg-green-100 dark:bg-green-900/30 text-green-700 dark:text-green-300 rounded-full">
+                  🔄 reposted
+                </span>
+                <span x-show="wm['wm-property'] === 'in-reply-to'" class="inline-flex items-center gap-1 px-2 py-0.5 text-xs bg-primary-100 dark:bg-primary-900/30 text-primary-700 dark:text-primary-300 rounded-full">
+                  💬 replied
+                </span>
+                <span x-show="wm['wm-property'] === 'mention-of'" class="inline-flex items-center gap-1 px-2 py-0.5 text-xs bg-yellow-100 dark:bg-yellow-900/30 text-yellow-700 dark:text-yellow-300 rounded-full">
+                  📣 mentioned
+                </span>
+                <span x-show="wm['wm-property'] === 'bookmark-of'" class="inline-flex items-center gap-1 px-2 py-0.5 text-xs bg-purple-100 dark:bg-purple-900/30 text-purple-700 dark:text-purple-300 rounded-full">
+                  🔖 bookmarked
+                </span>
+
+                <a :href="wm.url || '#'" target="_blank" rel="noopener" class="text-xs text-surface-500 hover:underline">
+                  <time :datetime="wm.published || wm['wm-received']" x-text="formatDate(wm.published || wm['wm-received'])"></time>
+                </a>
+              </div>
+
+              {# Content (for replies) #}
+              <div x-show="wm.content?.text" class="text-surface-700 dark:text-surface-300 text-sm mt-2" x-text="truncateText(wm.content?.text, 280)"></div>
+
+              {# Target URL - which of my posts this is about #}
+              <div class="mt-2 text-xs text-surface-500">
+                <span>on </span>
+                <a :href="wm['wm-target']" class="text-primary-600 dark:text-primary-400 hover:underline" x-text="formatTargetUrl(wm['wm-target'])"></a>
+              </div>
+            </div>
+          </div>
+        </div>
+      </template>
+
+      {# Empty state #}
+      <div x-show="!loading && filteredWebmentions.length === 0" class="text-center py-12 text-surface-500">
+        <p>No webmentions found for this filter.</p>
+      </div>
+
+      {# Pagination / Load more #}
+      <div x-show="hasMore" class="text-center pt-4">
+        <button
+          @click="loadMore()"
+          :disabled="loadingMore"
+          class="px-4 py-2 bg-surface-100 dark:bg-surface-800 hover:bg-surface-200 dark:hover:bg-surface-700 rounded-lg text-sm transition-colors disabled:opacity-50">
+          <span x-text="loadingMore ? 'Loading...' : 'Load More'"></span>
+        </button>
+      </div>
+    </div>
+
+    {# Info box #}
+    <div class="mt-12 p-6 bg-primary-50 dark:bg-primary-900/20 rounded-lg">
+      <h2 class="text-lg font-semibold text-surface-900 dark:text-surface-100 mb-2">About Webmentions</h2>
+      <p class="text-surface-600 dark:text-surface-400 text-sm mb-4">
+        Webmentions are a W3C standard for cross-site communication. When someone likes, reposts, or replies to my content
+        from their own site (or via Bluesky/Mastodon bridges), I receive a webmention notification.
+      </p>
+      <ul class="text-sm text-surface-600 dark:text-surface-400 space-y-1">
+        <li><strong>Likes</strong> - Someone appreciated this post</li>
+        <li><strong>Reposts</strong> - Someone shared this post</li>
+        <li><strong>Replies</strong> - Someone responded to this post</li>
+        <li><strong>Mentions</strong> - Someone linked to this post</li>
+      </ul>
+    </div>
+  </div>
 </div>
+
+<script>
+function interactionsApp() {
+  return {
+    activeTab: 'inbound',
+    loading: false,
+    loadingMore: false,
+    error: null,
+    webmentions: [],
+    filterType: 'all',
+    page: 0,
+    perPage: 50,
+    hasMore: true,
+
+    get likes() {
+      return this.webmentions.filter(wm => wm['wm-property'] === 'like-of');
+    },
+
+    get reposts() {
+      return this.webmentions.filter(wm => wm['wm-property'] === 'repost-of');
+    },
+
+    get replies() {
+      return this.webmentions.filter(wm => wm['wm-property'] === 'in-reply-to');
+    },
+
+    get mentions() {
+      return this.webmentions.filter(wm => wm['wm-property'] === 'mention-of');
+    },
+
+    get totalInbound() {
+      return this.webmentions.length;
+    },
+
+    get filteredWebmentions() {
+      if (this.filterType === 'all') return this.webmentions;
+      return this.webmentions.filter(wm => wm['wm-property'] === this.filterType);
+    },
+
+    async init() {
+      await this.fetchWebmentions();
+    },
+
+    async fetchWebmentions(reset = true) {
+      if (reset) {
+        this.page = 0;
+        this.webmentions = [];
+        this.hasMore = true;
+      }
+
+      this.loading = true;
+      this.error = null;
+
+      try {
+        const domain = '{{ site.webmentions.domain }}';
+        const url = `https://webmention.io/api/mentions.jf2?domain=${domain}&per-page=${this.perPage}&page=${this.page}&sort-by=published&sort-dir=down`;
+
+        const response = await fetch(url);
+        if (!response.ok) throw new Error(`HTTP ${response.status}`);
+
+        const data = await response.json();
+        const newMentions = data.children || [];
+
+        if (reset) {
+          this.webmentions = newMentions;
+        } else {
+          this.webmentions = [...this.webmentions, ...newMentions];
+        }
+
+        this.hasMore = newMentions.length === this.perPage;
+      } catch (err) {
+        this.error = `Failed to load webmentions: ${err.message}`;
+        console.error('[Interactions]', err);
+      } finally {
+        this.loading = false;
+      }
+    },
+
+    async loadMore() {
+      this.loadingMore = true;
+      this.page++;
+      await this.fetchWebmentions(false);
+      this.loadingMore = false;
+    },
+
+    formatDate(dateStr) {
+      if (!dateStr) return '';
+      const date = new Date(dateStr);
+      return date.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' });
+    },
+
+    truncateText(text, maxLen = 280) {
+      if (!text) return '';
+      if (text.length <= maxLen) return text;
+      return text.slice(0, maxLen).trim() + '...';
+    },
+
+    formatTargetUrl(url) {
+      if (!url) return '';
+      try {
+        const u = new URL(url);
+        // Return just the pathname, trimmed
+        let path = u.pathname;
+        if (path.length > 50) {
+          path = path.slice(0, 47) + '...';
+        }
+        return path || '/';
+      } catch {
+        return url;
+      }
+    }
+  };
+}
+</script>