feat(renderer): full article reader with TOC, font controls & print (M10.1)

- ArticleReader.vue: sticky TOC sidebar (desktop), mobile dropdown
- Auto-generated heading anchors with IntersectionObserver tracking
- Reading time estimate, font size controls (persisted localStorage)
- Print mode opens clean window with serif typography
- Long-form detection (>800 words + headings) shows "Read as article"
- Removed isDark conditionals from ArticleDetail (dark-only app)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/src/components/chat/ChatMessage.vue

@@ -277,6 +277,13 @@
         >
           View brief →
         </button>
+        <button
+          v-if="isLongForm"
+          class="text-[10px] text-accent/70 hover:text-accent transition-colors"
+          @click.stop="openLongFormArticle(message.content)"
+        >
+          Read as article →
+        </button>
       </div>
       </div>
     </div>
@@ -364,7 +371,7 @@ function submitEdit() {
   isEditing.value = false
   editContent.value = ''
 }
-const { getContextualInlineContent, stripContentTags, stripMarkdownLinks, updatePanelFromText, panelOpen, availableTabs, setActiveTab, openFilmDetail, openBookDetail, openTVSeriesDetail, openImageDetail, openPlaceDetail, openSongDetail, openPodcastDetail, openArticleDetail, openWebsiteDetail, closeFilmDetail, closeBookDetail, closeTVSeriesDetail, closeImageDetail, closePlaceDetail, closeSongDetail, closePodcastDetail } = useContentPanel()
+const { getContextualInlineContent, stripContentTags, stripMarkdownLinks, updatePanelFromText, panelOpen, availableTabs, setActiveTab, openFilmDetail, openBookDetail, openTVSeriesDetail, openImageDetail, openPlaceDetail, openSongDetail, openPodcastDetail, openArticleDetail, openWebsiteDetail, openLongFormArticle, closeFilmDetail, closeBookDetail, closeTVSeriesDetail, closeImageDetail, closePlaceDetail, closeSongDetail, closePodcastDetail } = useContentPanel()
 const codeContext = useCodeContext()
 
 const isUser = computed(() => props.message.role === 'user')
@@ -459,6 +466,15 @@ const formattedTime = computed(() => {
   return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
 })
 
+// Long-form article detection (>800 words + has headings)
+const isLongForm = computed(() => {
+  if (isUser.value) return false
+  const text = props.message.content
+  const words = text.split(/\s+/).length
+  const hasHeadings = /^#{2,3}\s+.+$/m.test(text)
+  return words > 800 && hasHeadings
+})
+
 // Token estimate (~4 chars per token)
 const estimatedTokens = computed(() => Math.ceil(props.message.content.length / 4))
 const showTokenCount = computed(() => props.message.content.length > 20)

packages/app/src/components/content/ArticleDetail.vue

@@ -32,14 +32,13 @@
     <div class="p-4 space-y-4">
       <article
         v-if="article.content"
-        class="[&_p]:mb-3 [&_ul]:list-disc [&_ol]:list-decimal [&_li]:ml-4 [&_a]:underline [&_a]:underline-offset-2 [&_h1]:text-lg [&_h2]:text-base [&_h3]:text-sm [&_blockquote]:border-l-2 [&_blockquote]:pl-3 [&_blockquote]:italic"
-        :class="isDark ? 'text-white/90' : 'text-gray-900'"
+        class="text-white/90 [&_p]:mb-3 [&_ul]:list-disc [&_ol]:list-decimal [&_li]:ml-4 [&_a]:underline [&_a]:underline-offset-2 [&_h1]:text-lg [&_h2]:text-base [&_h3]:text-sm [&_blockquote]:border-l-2 [&_blockquote]:pl-3 [&_blockquote]:italic"
       >
         <div v-html="sanitizedContent" />
       </article>
 
       <div v-else class="py-4">
-        <p class="text-sm" :class="isDark ? 'text-white/50' : 'text-gray-500'">
+        <p class="text-sm text-white/50">
           Full article content is not available. Open the link below to read on the source site.
         </p>
       </div>
@@ -49,10 +48,7 @@
         :href="article.url"
         target="_blank"
         rel="noopener noreferrer"
-        class="inline-flex items-center gap-2 p-3 rounded-xl transition-colors"
-        :class="isDark
-          ? 'bg-white/10 hover:bg-white/15 text-white/90'
-          : 'bg-black/5 hover:bg-black/10 text-gray-800'"
+        class="inline-flex items-center gap-2 p-3 rounded-xl transition-colors bg-white/10 hover:bg-white/15 text-white/90"
       >
         <svg class="w-4 h-4 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 6H6a2 2 0 00-2 2v10a2 2 0 002 2h10a2 2 0 002-2v-4M14 4h6m0 0v6m0-6L10 14" />
@@ -66,14 +62,11 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 import type { WebSearchResult } from '@aiui/core/types/message'
-import { useTheme } from '@/composables/useTheme'
 import { isSafeImgSrc, sanitizeHtml, escapeHtml } from '@/utils/html'
 
 const props = defineProps<{ article: WebSearchResult }>()
 defineEmits<{ back: [] }>()
 
-const { isDark } = useTheme()
-
 const articleDomain = computed(() => {
   const url = props.article?.url
   if (!url || typeof url !== 'string') return ''

packages/app/src/components/content/ContentPanel.vue

@@ -87,6 +87,12 @@
             :article="selectedArticle"
             @back="closeArticleDetail"
           />
+          <ArticleReader
+            v-else-if="longFormArticle"
+            :content="longFormArticle.content"
+            :title="longFormArticle.title"
+            @back="closeLongFormArticle"
+          />
 
           <!-- Grid views by active tab -->
           <component
@@ -170,6 +176,7 @@ import PodcastGrid from './PodcastGrid.vue'
 import PodcastDetail from './PodcastDetail.vue'
 import NewsGrid from './NewsGrid.vue'
 import ArticleDetail from './ArticleDetail.vue'
+import ArticleReader from '@/components/renderers/ArticleReader.vue'
 import MagazineGrid from './MagazineGrid.vue'
 import ProjectGrid from './ProjectGrid.vue'
 import NostrGrid from './NostrGrid.vue'
@@ -218,11 +225,13 @@ const {
   openPodcastDetail,
   closePodcastDetail,
   closeArticleDetail,
+  longFormArticle,
+  closeLongFormArticle,
   closePanel,
 } = useContentPanel()
 
 const hasDetailOpen = computed(() =>
-  !!(selectedFilm.value || selectedBook.value || selectedTVSeries.value || selectedSong.value || selectedPodcast.value || selectedArticle.value || selectedDesignSystemItem.value)
+  !!(selectedFilm.value || selectedBook.value || selectedTVSeries.value || selectedSong.value || selectedPodcast.value || selectedArticle.value || selectedDesignSystemItem.value || longFormArticle.value)
 )
 
 const windowWidth = ref(window.innerWidth)

packages/app/src/components/renderers/ArticleReader.vue

@@ -0,0 +1,259 @@
+<template>
+  <div class="article-reader h-full flex">
+    <!-- TOC Sidebar (desktop only) -->
+    <aside
+      v-if="headings.length > 1"
+      class="hidden lg:flex flex-col w-56 shrink-0 border-r border-white/5 overflow-y-auto scrollbar-hide py-4 px-3"
+    >
+      <p class="text-[10px] uppercase tracking-wider text-white/30 mb-2 px-2">Contents</p>
+      <button
+        v-for="(h, i) in headings"
+        :key="i"
+        class="text-left text-xs leading-relaxed py-1 px-2 rounded transition-colors truncate"
+        :class="[
+          activeHeadingIdx === i ? 'text-accent bg-accent/10' : 'text-white/50 hover:text-white/70 hover:bg-white/5',
+          h.level === 3 ? 'pl-5' : ''
+        ]"
+        @click="scrollToHeading(h.id)"
+      >
+        {{ h.text }}
+      </button>
+    </aside>
+
+    <!-- Main content -->
+    <div ref="contentRef" class="flex-1 overflow-y-auto scrollbar-hide">
+      <!-- Header bar -->
+      <div class="sticky top-0 z-10 flex items-center gap-2 px-4 py-2 bg-black/60 backdrop-blur-md border-b border-white/5">
+        <button
+          class="w-8 h-8 flex items-center justify-center rounded-lg text-white/60 hover:text-white/80 hover:bg-white/10 transition-colors"
+          title="Back"
+          @click="$emit('back')"
+        >
+          <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7" />
+          </svg>
+        </button>
+
+        <span class="flex-1 text-xs text-white/40 truncate">{{ readingTime }} min read</span>
+
+        <!-- TOC toggle (mobile) -->
+        <button
+          v-if="headings.length > 1"
+          class="lg:hidden w-8 h-8 flex items-center justify-center rounded-lg text-white/60 hover:text-white/80 hover:bg-white/10 transition-colors"
+          title="Table of contents"
+          @click="showMobileToc = !showMobileToc"
+        >
+          <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h7" />
+          </svg>
+        </button>
+
+        <!-- Font size -->
+        <button
+          class="w-8 h-8 flex items-center justify-center rounded-lg text-white/60 hover:text-white/80 hover:bg-white/10 transition-colors"
+          title="Decrease font size"
+          :disabled="fontSizeIdx <= 0"
+          @click="fontSizeIdx = Math.max(0, fontSizeIdx - 1)"
+        >
+          <span class="text-[10px] font-bold">A-</span>
+        </button>
+        <button
+          class="w-8 h-8 flex items-center justify-center rounded-lg text-white/60 hover:text-white/80 hover:bg-white/10 transition-colors"
+          title="Increase font size"
+          :disabled="fontSizeIdx >= fontSizes.length - 1"
+          @click="fontSizeIdx = Math.min(fontSizes.length - 1, fontSizeIdx + 1)"
+        >
+          <span class="text-xs font-bold">A+</span>
+        </button>
+
+        <!-- Print -->
+        <button
+          class="w-8 h-8 flex items-center justify-center rounded-lg text-white/60 hover:text-white/80 hover:bg-white/10 transition-colors"
+          title="Print"
+          @click="printArticle"
+        >
+          <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17 17h2a2 2 0 002-2v-4a2 2 0 00-2-2H5a2 2 0 00-2 2v4a2 2 0 002 2h2m2 4h6a2 2 0 002-2v-4a2 2 0 00-2-2H9a2 2 0 00-2 2v4a2 2 0 002 2zm8-12V5a2 2 0 00-2-2H9a2 2 0 00-2 2v4h10z" />
+          </svg>
+        </button>
+      </div>
+
+      <!-- Mobile TOC dropdown -->
+      <div
+        v-if="showMobileToc && headings.length > 1"
+        class="lg:hidden bg-black/40 backdrop-blur-md border-b border-white/5 px-4 py-2 space-y-0.5 animate-fade-up-fast"
+      >
+        <button
+          v-for="(h, i) in headings"
+          :key="i"
+          class="block w-full text-left text-xs py-1 px-2 rounded transition-colors truncate"
+          :class="[
+            activeHeadingIdx === i ? 'text-accent bg-accent/10' : 'text-white/50 hover:text-white/70',
+            h.level === 3 ? 'pl-5' : ''
+          ]"
+          @click="scrollToHeading(h.id); showMobileToc = false"
+        >
+          {{ h.text }}
+        </button>
+      </div>
+
+      <!-- Article body -->
+      <article
+        ref="articleRef"
+        class="article-body px-4 md:px-8 py-6 max-w-prose mx-auto leading-relaxed text-white/90"
+        :style="{ fontSize: fontSizes[fontSizeIdx] + 'px' }"
+      >
+        <h1 v-if="title" class="text-xl font-bold text-white/96 mb-4">{{ title }}</h1>
+        <div
+          class="article-content [&_h2]:text-lg [&_h2]:font-semibold [&_h2]:text-white/96 [&_h2]:mt-8 [&_h2]:mb-3 [&_h3]:text-base [&_h3]:font-medium [&_h3]:text-white/90 [&_h3]:mt-6 [&_h3]:mb-2 [&_p]:mb-4 [&_ul]:list-disc [&_ul]:ml-5 [&_ul]:mb-4 [&_ol]:list-decimal [&_ol]:ml-5 [&_ol]:mb-4 [&_li]:mb-1 [&_a]:text-accent [&_a]:underline [&_a]:underline-offset-2 [&_blockquote]:border-l-2 [&_blockquote]:border-accent/30 [&_blockquote]:pl-4 [&_blockquote]:italic [&_blockquote]:text-white/70 [&_blockquote]:my-4 [&_code]:bg-white/10 [&_code]:px-1.5 [&_code]:py-0.5 [&_code]:rounded [&_code]:text-[0.9em] [&_pre]:bg-white/5 [&_pre]:rounded-lg [&_pre]:p-4 [&_pre]:overflow-x-auto [&_pre]:my-4 [&_img]:rounded-lg [&_img]:max-w-full [&_img]:my-4 [&_hr]:border-white/10 [&_hr]:my-6"
+          v-html="renderedHtml"
+        />
+      </article>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, watch, onMounted, onBeforeUnmount } from 'vue'
+import MarkdownIt from 'markdown-it'
+
+const props = defineProps<{
+  content: string
+  title?: string
+}>()
+
+defineEmits<{ back: [] }>()
+
+// Font sizes
+const fontSizes = [13, 15, 17, 19, 21]
+const savedIdx = localStorage.getItem('aiui-article-font-size')
+const fontSizeIdx = ref(savedIdx ? parseInt(savedIdx, 10) : 1)
+
+watch(fontSizeIdx, (v) => {
+  localStorage.setItem('aiui-article-font-size', String(v))
+})
+
+const showMobileToc = ref(false)
+
+// markdown-it instance
+const md = new MarkdownIt({
+  html: false,
+  linkify: true,
+  breaks: true,
+})
+
+// Add IDs to headings for TOC anchoring
+md.renderer.rules.heading_open = (tokens, idx, options, _env, self) => {
+  const token = tokens[idx]
+  const level = parseInt(token.tag.slice(1), 10)
+  if (level === 2 || level === 3) {
+    const nextToken = tokens[idx + 1]
+    const text = nextToken?.children?.reduce((acc, t) => acc + (t.content || ''), '') || ''
+    const id = text.toLowerCase().replace(/[^\w]+/g, '-').replace(/(^-|-$)/g, '')
+    token.attrSet('id', id)
+  }
+  return self.renderToken(tokens, idx, options)
+}
+
+// Open links in new tab
+const defaultLinkOpen = md.renderer.rules.link_open || function (tokens, idx, options, _env, self) {
+  return self.renderToken(tokens, idx, options)
+}
+md.renderer.rules.link_open = function (tokens, idx, options, env, self) {
+  tokens[idx].attrSet('target', '_blank')
+  tokens[idx].attrSet('rel', 'noopener noreferrer')
+  return defaultLinkOpen(tokens, idx, options, env, self)
+}
+
+const renderedHtml = computed(() => md.render(props.content))
+
+// Extract headings for TOC
+interface Heading {
+  text: string
+  id: string
+  level: number
+}
+
+const headings = computed<Heading[]>(() => {
+  const result: Heading[] = []
+  const re = /^(#{2,3})\s+(.+)$/gm
+  let m: RegExpExecArray | null
+  while ((m = re.exec(props.content)) !== null) {
+    const text = m[2].trim()
+    const id = text.toLowerCase().replace(/[^\w]+/g, '-').replace(/(^-|-$)/g, '')
+    result.push({ text, id, level: m[1].length })
+  }
+  return result
+})
+
+// Reading time (~200 words/min)
+const readingTime = computed(() => {
+  const words = props.content.split(/\s+/).length
+  return Math.max(1, Math.ceil(words / 200))
+})
+
+// Active heading tracking via Intersection Observer
+const contentRef = ref<HTMLElement | null>(null)
+const articleRef = ref<HTMLElement | null>(null)
+const activeHeadingIdx = ref(0)
+let observer: IntersectionObserver | null = null
+
+function setupObserver() {
+  if (!contentRef.value) return
+  observer?.disconnect()
+  observer = new IntersectionObserver(
+    (entries) => {
+      for (const entry of entries) {
+        if (entry.isIntersecting) {
+          const id = (entry.target as HTMLElement).id
+          const idx = headings.value.findIndex((h) => h.id === id)
+          if (idx >= 0) activeHeadingIdx.value = idx
+        }
+      }
+    },
+    { root: contentRef.value, rootMargin: '-20% 0px -60% 0px', threshold: 0 }
+  )
+  const headingEls = articleRef.value?.querySelectorAll('h2[id], h3[id]')
+  headingEls?.forEach((el) => observer!.observe(el))
+}
+
+onMounted(() => {
+  setTimeout(setupObserver, 100)
+})
+
+watch(() => props.content, () => {
+  setTimeout(setupObserver, 100)
+})
+
+onBeforeUnmount(() => {
+  observer?.disconnect()
+})
+
+function scrollToHeading(id: string) {
+  const el = articleRef.value?.querySelector(`#${CSS.escape(id)}`)
+  el?.scrollIntoView({ behavior: 'smooth', block: 'start' })
+}
+
+function printArticle() {
+  const printWindow = window.open('', '_blank')
+  if (!printWindow) return
+  printWindow.document.write(`<!DOCTYPE html>
+<html><head><title>${props.title || 'Article'}</title>
+<style>
+  body { font-family: Georgia, serif; max-width: 700px; margin: 2em auto; padding: 0 1em; line-height: 1.7; color: #222; }
+  h1 { font-size: 1.8em; margin-bottom: 0.5em; }
+  h2 { font-size: 1.4em; margin-top: 1.5em; }
+  h3 { font-size: 1.2em; margin-top: 1.2em; }
+  code { background: #f0f0f0; padding: 2px 5px; border-radius: 3px; }
+  pre { background: #f5f5f5; padding: 1em; overflow-x: auto; border-radius: 5px; }
+  blockquote { border-left: 3px solid #ccc; padding-left: 1em; color: #555; }
+  img { max-width: 100%; }
+  a { color: #0066cc; }
+</style></head><body>
+${props.title ? `<h1>${props.title}</h1>` : ''}
+${renderedHtml.value}
+</body></html>`)
+  printWindow.document.close()
+  printWindow.print()
+}
+</script>

packages/app/src/composables/useContentPanel.ts

@@ -50,6 +50,7 @@ const contentType = ref<'film' | 'song' | 'podcast'>('film')
 const activeTab = ref<ContentTab>('film')
 const availableTabs = ref<ContentTab[]>([])
 const selectedDesignSystemItem = ref<DesignSystemItem | null>(null)
+const longFormArticle = ref<{ content: string; title?: string } | null>(null)
 
 export interface DesignSystemItem {
   id: string
@@ -271,6 +272,7 @@ export function useContentPanel() {
     selectedWebsite.value = null
     selectedMagazineSection.value = null
     selectedDesignSystemItem.value = null
+    longFormArticle.value = null
   }
 
   function openFilmDetail(film: Film) { clearAllSelections(); selectedFilm.value = film }
@@ -291,6 +293,9 @@ export function useContentPanel() {
   function openWebsiteDetail(website: WebSearchResult) { clearAllSelections(); selectedWebsite.value = website; panelOpen.value = true }
   function closeWebsiteDetail() { selectedWebsite.value = null }
 
+  function openLongFormArticle(content: string, title?: string) { clearAllSelections(); longFormArticle.value = { content, title }; panelOpen.value = true }
+  function closeLongFormArticle() { longFormArticle.value = null }
+
   function openMagazineSectionDetail(section: MagazineSection, index: number) {
     clearAllSelections()
     selectedMagazineSection.value = section
@@ -435,6 +440,9 @@ export function useContentPanel() {
     selectedDesignSystemItem,
     openDesignSystemItem,
     closeDesignSystemItem,
+    longFormArticle,
+    openLongFormArticle,
+    closeLongFormArticle,
     enterDesignSystemMode,
     closePanel,
     showAllFilms,