enhance rag retrieval + summary

frontend/src/components/BookPagePanel.vue

@@ -0,0 +1,239 @@
+<template>
+  <div class="book-panel">
+    <div class="book-panel-header">
+      <span class="book-panel-title">{{ bookTitle || 'Book' }} — p.&nbsp;{{ page }}</span>
+      <div class="book-panel-nav">
+        <button class="nav-btn" :disabled="page <= 1" @click="emit('navigate', page - 1)">&#8592;</button>
+        <button class="nav-btn" @click="emit('navigate', page + 1)">&#8594;</button>
+      </div>
+      <button class="close-btn" @click="emit('close')" title="Close">&#x2715;</button>
+    </div>
+
+    <div class="book-panel-body">
+      <div v-if="loading" class="panel-loading">
+        <div class="spinner spinner-dark" style="width:24px;height:24px;margin:0 auto 0.5rem;"></div>
+        <p>Loading page {{ page }}…</p>
+      </div>
+      <div v-else-if="error" class="panel-error">{{ error }}</div>
+      <div v-else class="markdown-body" v-html="renderedHtml"></div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, watch, onMounted, onUnmounted } from 'vue'
+import { api } from '@/services/api'
+
+const props = defineProps<{
+  bookId: string
+  page: number
+  bookTitle?: string
+}>()
+
+const emit = defineEmits<{
+  close: []
+  navigate: [page: number]
+}>()
+
+const loading = ref(false)
+const error = ref<string | null>(null)
+const renderedHtml = ref('')
+let activeBlobUrls: string[] = []
+
+onMounted(() => loadPage(props.page))
+
+watch(() => [props.bookId, props.page], () => loadPage(props.page))
+
+onUnmounted(() => {
+  activeBlobUrls.forEach(u => URL.revokeObjectURL(u))
+})
+
+async function loadPage(page: number) {
+  loading.value = true
+  error.value = null
+  renderedHtml.value = ''
+  activeBlobUrls.forEach(u => URL.revokeObjectURL(u))
+  activeBlobUrls = []
+
+  try {
+    const res = await api.get<string>(`/books/${props.bookId}/pages/${page}/html`, {
+      headers: { Accept: 'text/html' },
+      responseType: 'text'
+    })
+    renderedHtml.value = await resolveImages(res.data)
+  } catch (e: any) {
+    error.value = e.message ?? 'Failed to load page.'
+  } finally {
+    loading.value = false
+  }
+}
+
+async function resolveImages(html: string): Promise<string> {
+  const srcPattern = /src="(\/api\/v1\/figures\/[^"]+)"/g
+  const matches = [...html.matchAll(srcPattern)]
+  if (matches.length === 0) return html
+
+  const unique = [...new Set(matches.map(m => m[1]))]
+  const blobMap: Record<string, string> = {}
+
+  await Promise.all(
+    unique.map(async (src) => {
+      try {
+        const res = await api.get(src.replace(/^\/api\/v1/, ''), { responseType: 'blob' })
+        const blobUrl = URL.createObjectURL(res.data)
+        activeBlobUrls.push(blobUrl)
+        blobMap[src] = blobUrl
+      } catch {
+        // leave original src
+      }
+    })
+  )
+
+  return html.replace(/src="(\/api\/v1\/figures\/[^"]+)"/g, (_, src) =>
+    blobMap[src] ? `src="${blobMap[src]}"` : `src="${src}"`
+  )
+}
+</script>
+
+<style scoped>
+.book-panel {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  background: white;
+  border-left: 1px solid #e2e8f0;
+  border-radius: 0 10px 10px 0;
+  overflow: hidden;
+}
+
+.book-panel-header {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.6rem 0.75rem;
+  background: #f7fafc;
+  border-bottom: 1px solid #e2e8f0;
+  flex-shrink: 0;
+}
+
+.book-panel-title {
+  flex: 1;
+  font-size: 0.8rem;
+  font-weight: 600;
+  color: #2b6cb0;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.book-panel-nav {
+  display: flex;
+  gap: 0.25rem;
+}
+
+.nav-btn {
+  width: 1.75rem;
+  height: 1.75rem;
+  border: 1px solid #cbd5e0;
+  border-radius: 5px;
+  background: white;
+  cursor: pointer;
+  font-size: 0.85rem;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: background 0.15s;
+}
+.nav-btn:hover:not(:disabled) { background: #ebf8ff; border-color: #3182ce; }
+.nav-btn:disabled { opacity: 0.4; cursor: not-allowed; }
+
+.close-btn {
+  width: 1.75rem;
+  height: 1.75rem;
+  border: none;
+  border-radius: 5px;
+  background: none;
+  cursor: pointer;
+  font-size: 1rem;
+  color: #718096;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: background 0.15s, color 0.15s;
+}
+.close-btn:hover { background: #fed7d7; color: #742a2a; }
+
+.book-panel-body {
+  flex: 1;
+  overflow-y: auto;
+  padding: 1rem 1.25rem;
+}
+
+.panel-loading {
+  text-align: center;
+  padding: 2rem;
+  color: #718096;
+  font-size: 0.875rem;
+}
+
+.panel-error {
+  padding: 1rem;
+  background: #fff5f5;
+  border: 1px solid #fed7d7;
+  color: #742a2a;
+  border-radius: 6px;
+  font-size: 0.875rem;
+}
+
+.markdown-body {
+  font-size: 0.9rem;
+  line-height: 1.75;
+  color: #2d3748;
+}
+
+.markdown-body :deep(h1),
+.markdown-body :deep(h2),
+.markdown-body :deep(h3) {
+  color: #1a365d;
+  font-weight: 600;
+  margin: 1.25rem 0 0.5rem;
+}
+.markdown-body :deep(h2) { font-size: 1.05rem; border-bottom: 1px solid #e2e8f0; padding-bottom: 0.3rem; }
+.markdown-body :deep(h3) { font-size: 0.95rem; }
+.markdown-body :deep(p) { margin: 0.6rem 0; }
+.markdown-body :deep(img) {
+  max-width: 100%;
+  border-radius: 6px;
+  display: block;
+  margin: 0.75rem auto;
+  box-shadow: 0 1px 4px rgba(0,0,0,0.12);
+}
+.markdown-body :deep(ul),
+.markdown-body :deep(ol) { padding-left: 1.4rem; margin: 0.5rem 0; }
+.markdown-body :deep(code) {
+  background: #f7fafc;
+  border: 1px solid #e2e8f0;
+  border-radius: 3px;
+  padding: 0.1em 0.3em;
+  font-size: 0.85em;
+}
+.markdown-body :deep(blockquote) {
+  border-left: 3px solid #3182ce;
+  padding-left: 0.75rem;
+  color: #4a5568;
+  margin: 0.5rem 0;
+}
+.markdown-body :deep(table) {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 0.875em;
+  margin: 0.75rem 0;
+}
+.markdown-body :deep(th),
+.markdown-body :deep(td) {
+  border: 1px solid #e2e8f0;
+  padding: 0.35rem 0.6rem;
+  text-align: left;
+}
+.markdown-body :deep(th) { background: #f7fafc; font-weight: 600; }
+</style>

frontend/src/components/ChatMessage.vue

@@ -3,22 +3,30 @@
     <div class="message-bubble" :class="isUser ? 'bubble-user' : 'bubble-assistant'">
       <div class="message-role">{{ isUser ? 'You' : 'AI Teacher' }}</div>
       <div v-if="isUser" class="message-content">{{ message.content }}</div>
-      <div v-else class="message-content message-content--markdown" v-html="renderedContent"></div>
+      <div v-else class="message-content message-content--markdown" v-html="renderedWithBadges" @click="onContentClick"></div>
 
       <!-- Sources for assistant messages -->
       <div v-if="!isUser && message.sources && message.sources.length > 0" class="message-sources">
         <div class="sources-label">Sources:</div>
-        <div class="source-list">
+        <div class="source-list" ref="sourceListEl">
           <!-- TEXT sources -->
           <div
             v-for="(source, idx) in textSources"
             :key="'text-' + idx"
             class="source-item"
+            :class="{ 'source-item--active': activeRef === source.refLabel }"
+            :data-ref-label="source.refLabel"
           >
-            <div class="source-chip source-chip--text">
+            <div
+              class="source-chip source-chip--text"
+              :class="{ 'source-chip--clickable': source.bookId && source.page }"
+              @click="source.bookId && source.page ? emit('open-source', source.bookId, source.page) : undefined"
+            >
               <span class="source-icon">📖</span>
+              <span v-if="source.refLabel" class="source-ref-label">{{ source.refLabel }}</span>
               <span class="source-book-title">{{ source.bookTitle }}</span>
               <span v-if="source.page" class="source-page">p.&nbsp;{{ source.page }}</span>
+              <span v-if="source.bookId && source.page" class="source-open-hint">↗</span>
             </div>
             <div v-if="source.chunkText" class="source-chunk">{{ source.chunkText }}</div>
           </div>
@@ -28,12 +36,20 @@
             v-for="(source, idx) in figureSources"
             :key="'fig-' + idx"
             class="source-item source-item--figure"
+            :class="{ 'source-item--active': activeRef === source.refLabel }"
+            :data-ref-label="source.refLabel"
           >
-            <div class="source-chip source-chip--figure">
+            <div
+              class="source-chip source-chip--figure"
+              :class="{ 'source-chip--clickable': source.bookId && source.page }"
+              @click="source.bookId && source.page ? emit('open-source', source.bookId, source.page) : undefined"
+            >
               <span class="source-icon">🖼️</span>
+              <span v-if="source.refLabel" class="source-ref-label source-ref-label--figure">{{ source.refLabel }}</span>
               <span class="source-figure-label">{{ source.label || 'Figure' }}</span>
               <span v-if="source.page" class="source-page">p.&nbsp;{{ source.page }}</span>
               <span v-if="source.figureType" class="source-figure-type">{{ formatFigureType(source.figureType) }}</span>
+              <span v-if="source.bookId && source.page" class="source-open-hint">↗</span>
             </div>
             <div v-if="source.caption" class="source-caption">{{ source.caption }}</div>
             <div class="source-figure-image">
@@ -55,7 +71,7 @@
 </template>
 
 <script setup lang="ts">
-import { computed } from 'vue'
+import { computed, ref } from 'vue'
 import { marked } from 'marked'
 import type { ChatMessage, ChatSource } from '@/stores/chatStore'
 
@@ -63,8 +79,43 @@ const props = defineProps<{
   message: ChatMessage
 }>()
 
+const emit = defineEmits<{
+  'open-source': [bookId: string, page: number]
+}>()
+
 const isUser = computed(() => props.message.role === 'USER')
-const renderedContent = computed(() => marked.parse(props.message.content) as string)
+const activeRef = ref<string | null>(null)
+const sourceListEl = ref<HTMLElement | null>(null)
+
+/** Replaces [S1]/[F1]-style labels in the rendered HTML with clickable badges. */
+const renderedWithBadges = computed(() => {
+  const html = marked.parse(props.message.content) as string
+  return html.replace(/\[(S|F)\d+\]/g, (match) => {
+    const inner = match.slice(1, -1) // e.g. "S1"
+    return `<span class="citation-badge" data-ref="${inner}" title="Jump to source ${inner}">${match}</span>`
+  })
+})
+
+function onContentClick(e: MouseEvent) {
+  const target = e.target as HTMLElement
+  if (!target.classList.contains('citation-badge')) return
+
+  const label = target.getAttribute('data-ref') // e.g. "S1" or "F1"
+  if (!label) return
+
+  activeRef.value = activeRef.value === label ? null : label
+
+  // Scroll to the matching source chip
+  const sourceEl = sourceListEl.value?.querySelector(`[data-ref-label="${label}"]`) as HTMLElement | null
+  sourceEl?.scrollIntoView({ behavior: 'smooth', block: 'start' })
+
+  // Open the book at the referenced page
+  const allSources = props.message.sources ?? []
+  const source = allSources.find((s: ChatSource) => s.refLabel === label)
+  if (source?.bookId && source.page) {
+    emit('open-source', source.bookId, source.page)
+  }
+}
 
 const textSources = computed(() =>
   (props.message.sources ?? []).filter((s: ChatSource) => s.type === 'TEXT' || !s.type)
@@ -255,6 +306,22 @@ function formatTime(iso: string): string {
   border: 1px solid #bee3f8;
 }
 
+.source-chip--clickable {
+  cursor: pointer;
+  transition: background 0.15s, border-color 0.15s;
+}
+
+.source-chip--clickable:hover {
+  background: #bee3f8;
+  border-color: #90cdf4;
+}
+
+.source-open-hint {
+  font-size: 0.75rem;
+  color: #3182ce;
+  margin-left: 0.1rem;
+}
+
 .source-chip--figure {
   background: #f0fff4;
   border: 1px solid #9ae6b4;
@@ -322,6 +389,43 @@ function formatTime(iso: string): string {
   font-style: italic;
 }
 
+.message-content--markdown :deep(.citation-badge) {
+  display: inline-block;
+  background: #ebf8ff;
+  border: 1px solid #90cdf4;
+  border-radius: 3px;
+  padding: 0 0.3em;
+  font-size: 0.78em;
+  font-weight: 600;
+  color: #2b6cb0;
+  cursor: pointer;
+  user-select: none;
+  transition: background 0.15s;
+}
+
+.message-content--markdown :deep(.citation-badge:hover) {
+  background: #bee3f8;
+}
+
+.source-item--active {
+  outline: 2px solid #4299e1;
+  border-radius: 6px;
+}
+
+.source-ref-label {
+  font-size: 0.72rem;
+  font-weight: 700;
+  background: #bee3f8;
+  color: #2b6cb0;
+  border-radius: 3px;
+  padding: 0 0.3rem;
+}
+
+.source-ref-label--figure {
+  background: #9ae6b4;
+  color: #276749;
+}
+
 .message-timestamp {
   font-size: 0.7rem;
   opacity: 0.6;

frontend/src/stores/chatStore.ts

@@ -4,8 +4,10 @@ import { api } from '@/services/api'
 
 export interface ChatSource {
   type: 'TEXT' | 'FIGURE'
+  bookId?: string
   bookTitle: string
   page: number | null
+  refLabel?: string
   // TEXT-specific
   chunkText?: string
   // FIGURE-specific

frontend/src/stores/topicStore.ts

@@ -10,11 +10,14 @@ export interface Topic {
 }
 
 export interface SourceReference {
+  bookId: string | null
   bookTitle: string
   page: number | null
 }
 
 export interface TopicSummary {
+  id: string
+  summaryNumber: number
   topicId: string
   topicName: string
   summary: string
@@ -22,12 +25,20 @@ export interface TopicSummary {
   generatedAt: string
 }
 
+export interface SavedSummaryItem {
+  id: string
+  summaryNumber: number
+  generatedAt: string
+}
+
 export const useTopicStore = defineStore('topics', () => {
   const topics = ref<Topic[]>([])
   const activeSummary = ref<TopicSummary | null>(null)
   const activeSummaryTopicId = ref<string | null>(null)
+  const summaryList = ref<SavedSummaryItem[]>([])
   const loading = ref(false)
   const summaryLoading = ref(false)
+  const summaryListLoading = ref(false)
   const error = ref<string | null>(null)
 
   async function fetchTopics() {
@@ -43,6 +54,36 @@ export const useTopicStore = defineStore('topics', () => {
     }
   }
 
+  async function fetchSummaries(topicId: string) {
+    summaryListLoading.value = true
+    summaryList.value = []
+    error.value = null
+    try {
+      const response = await api.get<SavedSummaryItem[]>(`/topics/${topicId}/summaries`)
+      summaryList.value = response.data
+    } catch (err: any) {
+      error.value = err.message
+    } finally {
+      summaryListLoading.value = false
+    }
+  }
+
+  async function fetchSummaryDetail(topicId: string, summaryId: string): Promise<TopicSummary | null> {
+    summaryLoading.value = true
+    activeSummary.value = null
+    error.value = null
+    try {
+      const response = await api.get<TopicSummary>(`/topics/${topicId}/summaries/${summaryId}`)
+      activeSummary.value = response.data
+      return response.data
+    } catch (err: any) {
+      error.value = err.message
+      return null
+    } finally {
+      summaryLoading.value = false
+    }
+  }
+
   async function generateSummary(topicId: string): Promise<TopicSummary | null> {
     summaryLoading.value = true
     activeSummaryTopicId.value = topicId
@@ -65,10 +106,14 @@ export const useTopicStore = defineStore('topics', () => {
     topics,
     activeSummary,
     activeSummaryTopicId,
+    summaryList,
     loading,
     summaryLoading,
+    summaryListLoading,
     error,
     fetchTopics,
+    fetchSummaries,
+    fetchSummaryDetail,
     generateSummary
   }
 })

frontend/src/views/ChatView.vue

@@ -3,27 +3,10 @@
     <h1 class="page-title">Knowledge Chat</h1>
     <p class="page-subtitle">Ask questions grounded in your uploaded medical textbooks.</p>
 
-    <!-- Step 1: Topic Selection -->
-    <div v-if="!chatStore.session && !selectedTopic" class="topic-selection">
-      <h2 class="section-title">Select a Topic</h2>
-      <div class="topic-grid">
-        <button
-          v-for="topic in topicStore.topics"
-          :key="topic.id"
-          :class="['topic-tile', { 'topic-tile-freeform': topic.id === 'free-form' }]"
-          @click="handleTopicSelect(topic)"
-        >
-          <span class="topic-tile-name">{{ topic.name }}</span>
-          <span v-if="topic.id === 'free-form'" class="topic-tile-hint">Any neurosurgery question</span>
-        </button>
-      </div>
-    </div>
-
-    <!-- Step 2: Topic selected — previous sessions + new chat -->
-    <div v-else-if="!chatStore.session && selectedTopic" class="session-setup card">
+    <!-- Session selection -->
+    <div v-if="!chatStore.session" class="session-setup card">
       <div class="setup-header">
-        <button class="btn-back" @click="handleBack">← Topics</button>
-        <h2 class="section-title">{{ selectedTopic.name }}</h2>
+        <h2 class="section-title">Free-form Chat</h2>
       </div>
 
       <div v-if="chatStore.error" class="error-banner">{{ chatStore.error }}</div>
@@ -71,56 +54,74 @@
         </div>
       </div>
 
-      <!-- Messages Area -->
-      <div class="messages-container" ref="messagesContainer">
-        <div v-if="chatStore.loading && chatStore.messages.length === 0" class="empty-state">
-          <div class="spinner spinner-dark" style="width:32px;height:32px;margin:0 auto 1rem;"></div>
-          <p class="empty-state-text">Loading messages...</p>
-        </div>
+      <!-- Chat + Reader split -->
+      <div class="chat-reader-split">
+        <!-- Messages + Input -->
+        <div class="chat-column">
+          <!-- Messages Area -->
+          <div class="messages-container" ref="messagesContainer">
+            <div v-if="chatStore.loading && chatStore.messages.length === 0" class="empty-state">
+              <div class="spinner spinner-dark" style="width:32px;height:32px;margin:0 auto 1rem;"></div>
+              <p class="empty-state-text">Loading messages...</p>
+            </div>
 
-        <div v-else-if="chatStore.messages.length === 0" class="empty-state">
-          <div class="empty-state-icon">💬</div>
-          <p class="empty-state-text">No messages yet</p>
-          <p class="empty-state-hint">Ask a question about the uploaded books below.</p>
-        </div>
+            <div v-else-if="chatStore.messages.length === 0" class="empty-state">
+              <div class="empty-state-icon">💬</div>
+              <p class="empty-state-text">No messages yet</p>
+              <p class="empty-state-hint">Ask a question about the uploaded books below.</p>
+            </div>
 
-        <div v-else class="messages-list">
-          <ChatMessage
-            v-for="message in chatStore.messages"
-            :key="message.id"
-            :message="message"
-          />
-          <div v-if="chatStore.sending" class="typing-indicator">
-            <div class="typing-bubble">
-              <span></span><span></span><span></span>
+            <div v-else class="messages-list">
+              <ChatMessage
+                v-for="message in chatStore.messages"
+                :key="message.id"
+                :message="message"
+                @open-source="handleOpenSource"
+              />
+              <div v-if="chatStore.sending" class="typing-indicator">
+                <div class="typing-bubble">
+                  <span></span><span></span><span></span>
+                </div>
+              </div>
             </div>
           </div>
-        </div>
-      </div>
 
-      <!-- Input Area -->
-      <div class="input-area card">
-        <div v-if="chatStore.error" class="error-banner">{{ chatStore.error }}</div>
-        <div class="input-row">
-          <textarea
-            v-model="inputText"
-            class="message-input"
-            placeholder="Ask a question about your uploaded books..."
-            rows="2"
-            :disabled="chatStore.sending"
-            @keydown.enter.exact.prevent="handleSend"
-            @keydown.enter.shift.exact="inputText += '\n'"
-          ></textarea>
-          <button
-            class="btn btn-primary send-btn"
-            :disabled="!inputText.trim() || chatStore.sending"
-            @click="handleSend"
-          >
-            <span v-if="chatStore.sending" class="spinner"></span>
-            <span v-else>Send</span>
-          </button>
+          <!-- Input Area -->
+          <div class="input-area card">
+            <div v-if="chatStore.error" class="error-banner">{{ chatStore.error }}</div>
+            <div class="input-row">
+              <textarea
+                v-model="inputText"
+                class="message-input"
+                placeholder="Ask a question about your uploaded books..."
+                rows="2"
+                :disabled="chatStore.sending"
+                @keydown.enter.exact.prevent="handleSend"
+                @keydown.enter.shift.exact="inputText += '\n'"
+              ></textarea>
+              <button
+                class="btn btn-primary send-btn"
+                :disabled="!inputText.trim() || chatStore.sending"
+                @click="handleSend"
+              >
+                <span v-if="chatStore.sending" class="spinner"></span>
+                <span v-else>Send</span>
+              </button>
+            </div>
+            <p class="input-hint">Press Enter to send, Shift+Enter for new line.</p>
+          </div>
         </div>
-        <p class="input-hint">Press Enter to send, Shift+Enter for new line.</p>
+
+        <!-- Inline book reader panel -->
+        <BookPagePanel
+          v-if="readerPanel"
+          :book-id="readerPanel.bookId"
+          :page="readerPanel.page"
+          :book-title="readerPanel.bookTitle"
+          class="reader-panel"
+          @close="readerPanel = null"
+          @navigate="(p) => readerPanel && (readerPanel.page = p)"
+        />
       </div>
     </div>
   </div>
@@ -130,8 +131,10 @@
 import { ref, nextTick, onMounted, watch, inject } from 'vue'
 import { useChatStore } from '@/stores/chatStore'
 import { useTopicStore } from '@/stores/topicStore'
+import { useBookStore } from '@/stores/bookStore'
 import type { ChatSession } from '@/stores/chatStore'
 import ChatMessage from '@/components/ChatMessage.vue'
+import BookPagePanel from '@/components/BookPagePanel.vue'
 
 interface Topic {
   id: string
@@ -142,6 +145,7 @@ interface Topic {
 
 const chatStore = useChatStore()
 const topicStore = useTopicStore()
+const bookStore = useBookStore()
 const showToast = inject<(msg: string, type?: 'error' | 'success') => void>('showToast')
 
 const selectedTopic = ref<Topic | null>(null)
@@ -150,10 +154,22 @@ const loadingTopicSessions = ref(false)
 const inputText = ref('')
 const messagesContainer = ref<HTMLElement | null>(null)
 
+interface ReaderPanel { bookId: string; page: number; bookTitle?: string }
+const readerPanel = ref<ReaderPanel | null>(null)
+
+function handleOpenSource(bookId: string, page: number) {
+  const book = bookStore.books.find(b => b.id === bookId)
+  readerPanel.value = { bookId, page, bookTitle: book?.title }
+}
+
 onMounted(async () => {
   if (topicStore.topics.length === 0) {
     await topicStore.fetchTopics()
   }
+  const freeForm = topicStore.topics.find((t) => t.id === 'free-form')
+  if (freeForm) {
+    await handleTopicSelect(freeForm)
+  }
 })
 
 watch(
@@ -189,11 +205,6 @@ async function handleTopicSelect(topic: Topic) {
   loadingTopicSessions.value = false
 }
 
-function handleBack() {
-  selectedTopic.value = null
-  topicSessions.value = []
-}
-
 async function handleNewChat() {
   const ok = await chatStore.createSession(selectedTopic.value!.id)
   if (!ok) {
@@ -207,9 +218,7 @@ async function handleResumeSession(session: ChatSession) {
 }
 
 function handleLeaveSession() {
-  // Leave without deleting — session stays in DB and will appear in "Previous Chats"
   chatStore.leaveSession()
-  // Refresh the sessions list for the current topic
   if (selectedTopic.value) {
     loadingTopicSessions.value = true
     chatStore.fetchSessionsByTopic(selectedTopic.value.id).then((sessions) => {
@@ -231,12 +240,6 @@ async function handleSend() {
 </script>
 
 <style scoped>
-.topic-selection {
-  display: flex;
-  flex-direction: column;
-  gap: 1.25rem;
-}
-
 .section-title {
   font-size: 1.1rem;
   font-weight: 600;
@@ -244,52 +247,6 @@ async function handleSend() {
   margin: 0;
 }
 
-.topic-grid {
-  display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
-  gap: 0.75rem;
-}
-
-.topic-tile {
-  display: flex;
-  flex-direction: column;
-  align-items: flex-start;
-  gap: 0.25rem;
-  padding: 1rem 1.1rem;
-  background: white;
-  border: 1px solid #e2e8f0;
-  border-radius: 8px;
-  cursor: pointer;
-  text-align: left;
-  transition: border-color 0.15s, box-shadow 0.15s;
-}
-
-.topic-tile:hover {
-  border-color: #3182ce;
-  box-shadow: 0 2px 8px rgba(49, 130, 206, 0.15);
-}
-
-.topic-tile-freeform {
-  border-style: dashed;
-  border-color: #a0aec0;
-}
-
-.topic-tile-freeform:hover {
-  border-color: #718096;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
-}
-
-.topic-tile-name {
-  font-size: 0.9rem;
-  font-weight: 600;
-  color: #2d3748;
-}
-
-.topic-tile-hint {
-  font-size: 0.78rem;
-  color: #a0aec0;
-}
-
 .session-setup {
   max-width: 540px;
 }
@@ -381,6 +338,29 @@ async function handleSend() {
   min-height: 500px;
 }
 
+.chat-reader-split {
+  display: flex;
+  flex: 1;
+  min-height: 0;
+  gap: 0;
+}
+
+.chat-column {
+  display: flex;
+  flex-direction: column;
+  flex: 1;
+  min-width: 0;
+  gap: 1rem;
+}
+
+.reader-panel {
+  width: 420px;
+  flex-shrink: 0;
+  border-radius: 10px;
+  margin-left: 1rem;
+  box-shadow: -2px 0 8px rgba(0, 0, 0, 0.07);
+}
+
 .session-bar {
   display: flex;
   align-items: center;

frontend/src/views/TopicsView.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="topics-view">
     <h1 class="page-title">Topics</h1>
-    <p class="page-subtitle">Select a topic to generate an AI-powered summary from uploaded books.</p>
+    <p class="page-subtitle">Select a topic to view or generate an AI-powered summary from uploaded books.</p>
 
     <!-- Loading state -->
     <div v-if="topicStore.loading" class="empty-state">
@@ -18,83 +18,198 @@
     </div>
 
     <div v-else class="topics-layout">
-      <!-- Topic Grid -->
-      <div class="topic-grid">
-        <TopicCard
-          v-for="topic in topicStore.topics"
-          :key="topic.id"
-          :topic="topic"
-          :is-generating="topicStore.activeSummaryTopicId === topic.id"
-          @generate="handleGenerate"
-        />
-      </div>
+      <div class="topics-main">
 
-      <!-- Summary Panel -->
-      <div v-if="topicStore.summaryLoading" class="summary-panel card">
-        <div class="summary-loading">
-          <div class="spinner spinner-dark" style="width:36px;height:36px;margin:0 auto 1rem;"></div>
-          <p class="summary-loading-text">Generating summary from uploaded books...</p>
-          <p class="summary-loading-hint">This may take up to 30 seconds.</p>
-        </div>
-      </div>
+        <!-- Summary history list -->
+        <div v-if="selectedTopicId" class="history-panel card">
+          <div class="history-header">
+            <span class="history-title">Saved summaries</span>
+            <button class="btn btn-primary btn-sm" :disabled="topicStore.summaryLoading" @click="handleGenerate(selectedTopicId!)">
+              <span v-if="topicStore.summaryLoading" class="spinner" style="width:14px;height:14px;display:inline-block;vertical-align:middle;margin-right:4px;"></span>
+              Generate New
+            </button>
+          </div>
 
-      <div v-else-if="summaryError" class="summary-panel card summary-error">
-        <h2 class="summary-topic-name">Summary Error</h2>
-        <p class="error-text">{{ summaryError }}</p>
-        <p v-if="isNoBooks" class="no-books-hint">
-          Please
-          <RouterLink to="/">upload and process at least one book</RouterLink>
-          first.
-        </p>
-      </div>
+          <div v-if="topicStore.summaryListLoading" class="history-loading">
+            <div class="spinner spinner-dark" style="width:20px;height:20px;margin-right:8px;display:inline-block;vertical-align:middle;"></div>
+            Loading...
+          </div>
 
-      <div v-else-if="topicStore.activeSummary" class="summary-panel card">
-        <div class="summary-header">
-          <h2 class="summary-topic-name">{{ topicStore.activeSummary.topicName }}</h2>
-          <span class="summary-timestamp">{{ formatDate(topicStore.activeSummary.generatedAt) }}</span>
-        </div>
+          <div v-else-if="topicStore.summaryList.length === 0" class="history-empty">
+            No summaries yet. Click "Generate New" to create one.
+          </div>
 
-        <div class="summary-text">{{ topicStore.activeSummary.summary }}</div>
-
-        <div v-if="topicStore.activeSummary.sources.length > 0" class="sources-section">
-          <button class="sources-toggle" @click="showSources = !showSources">
-            Sources ({{ topicStore.activeSummary.sources.length }})
-            <span>{{ showSources ? '▲' : '▼' }}</span>
-          </button>
-          <div v-if="showSources" class="sources-list">
-            <div
-              v-for="(source, idx) in topicStore.activeSummary.sources"
-              :key="idx"
-              class="source-chip"
+          <div v-else class="history-list">
+            <button
+              v-for="item in topicStore.summaryList"
+              :key="item.id"
+              class="history-chip"
+              :class="{ 'history-chip--active': topicStore.activeSummary?.id === item.id }"
+              @click="handleLoadSummary(item)"
             >
-              <span class="source-book">{{ source.bookTitle }}</span>
-              <span v-if="source.page" class="source-page">p. {{ source.page }}</span>
-            </div>
+              Summary #{{ item.summaryNumber }}
+              <span class="history-chip-date">· {{ formatDateShort(item.generatedAt) }}</span>
+            </button>
           </div>
         </div>
-        <div v-else class="no-sources">
-          No source citations available for this summary.
+
+        <!-- Summary Panel -->
+        <div v-if="topicStore.summaryLoading" class="summary-panel card">
+          <div class="summary-loading">
+            <div class="spinner spinner-dark" style="width:36px;height:36px;margin:0 auto 1rem;"></div>
+            <p class="summary-loading-text">Generating summary from uploaded books...</p>
+            <p class="summary-loading-hint">This may take up to 30 seconds.</p>
+          </div>
         </div>
-      </div>
+
+        <div v-else-if="summaryError" class="summary-panel card summary-error">
+          <h2 class="summary-topic-name">Summary Error</h2>
+          <p class="error-text">{{ summaryError }}</p>
+          <p v-if="isNoBooks" class="no-books-hint">
+            Please
+            <RouterLink to="/">upload and process at least one book</RouterLink>
+            first.
+          </p>
+        </div>
+
+        <div v-else-if="!topicStore.activeSummary" class="summary-panel card summary-placeholder">
+          <p class="summary-placeholder-text">
+            {{ selectedTopicId ? 'Select a saved summary or generate a new one.' : 'Select a topic to get started.' }}
+          </p>
+        </div>
+
+        <div v-else class="summary-panel card">
+          <div class="summary-header">
+            <h2 class="summary-topic-name">{{ topicStore.activeSummary.topicName }}</h2>
+            <div class="summary-meta">
+              <span v-if="topicStore.activeSummary.summaryNumber" class="summary-number">
+                Summary #{{ topicStore.activeSummary.summaryNumber }}
+              </span>
+              <span class="summary-timestamp">{{ formatDate(topicStore.activeSummary.generatedAt) }}</span>
+            </div>
+          </div>
+
+          <div class="summary-text summary-text--markdown" v-html="renderedSummary" @click="handleSummaryClick"></div>
+
+          <div ref="sourcesSection" v-if="topicStore.activeSummary.sources.length > 0" class="sources-section">
+            <button class="sources-toggle" @click="showSources = !showSources">
+              Sources ({{ topicStore.activeSummary.sources.length }})
+              <span>{{ showSources ? '▲' : '▼' }}</span>
+            </button>
+            <div v-if="showSources" class="sources-list">
+              <div
+                v-for="(source, idx) in topicStore.activeSummary.sources"
+                :key="idx"
+                class="source-chip"
+                :class="{ 'source-chip--clickable': source.bookId && source.page }"
+                @click="source.bookId && source.page ? handleOpenSource(source.bookId, source.page) : undefined"
+              >
+                <span class="source-icon">📖</span>
+                <span class="source-book">{{ source.bookTitle }}</span>
+                <span v-if="source.page" class="source-page">p.&nbsp;{{ source.page }}</span>
+                <span v-if="source.bookId && source.page" class="source-open-hint">↗</span>
+              </div>
+            </div>
+
+            <BookPagePanel
+              v-if="readerPanel"
+              :book-id="readerPanel.bookId"
+              :page="readerPanel.page"
+              :book-title="readerPanel.bookTitle"
+              class="reader-panel"
+              @close="readerPanel = null"
+              @navigate="(p) => readerPanel && (readerPanel.page = p)"
+            />
+          </div>
+          <div v-else class="no-sources">
+            No source citations available for this summary.
+          </div>
+        </div>
+
+        <!-- Topic Grid -->
+        <div class="topic-grid">
+          <TopicCard
+            v-for="topic in summaryTopics"
+            :key="topic.id"
+            :topic="topic"
+            :is-generating="topicStore.activeSummaryTopicId === topic.id"
+            :is-selected="selectedTopicId === topic.id"
+            @generate="handleTopicClick"
+          />
+        </div>
+      </div><!-- end topics-main -->
     </div>
   </div>
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted, inject } from 'vue'
+import { ref, computed, onMounted, inject } from 'vue'
+import { marked } from 'marked'
 import { RouterLink } from 'vue-router'
-import { useTopicStore } from '@/stores/topicStore'
+import { useTopicStore, type SavedSummaryItem } from '@/stores/topicStore'
+import { useBookStore } from '@/stores/bookStore'
 import TopicCard from '@/components/TopicCard.vue'
+import BookPagePanel from '@/components/BookPagePanel.vue'
 
 const topicStore = useTopicStore()
+const bookStore = useBookStore()
 const showToast = inject<(msg: string, type?: 'error' | 'success') => void>('showToast')
 
 const showSources = ref(true)
 const summaryError = ref<string | null>(null)
 const isNoBooks = ref(false)
+const sourcesSection = ref<HTMLElement | null>(null)
+const selectedTopicId = ref<string | null>(null)
+
+interface ReaderPanel { bookId: string; page: number; bookTitle?: string }
+const readerPanel = ref<ReaderPanel | null>(null)
+
+const summaryTopics = computed(() => topicStore.topics.filter(t => t.id !== 'free-form'))
+
+const renderedSummary = computed(() => {
+  if (!topicStore.activeSummary) return ''
+  const html = marked.parse(topicStore.activeSummary.summary) as string
+  return html.replace(/\[S(\d+)\]/g, '<span class="source-ref">[S$1]</span>')
+})
+
+function handleSummaryClick(e: MouseEvent) {
+  if ((e.target as HTMLElement).classList.contains('source-ref')) {
+    showSources.value = true
+    sourcesSection.value?.scrollIntoView({ behavior: 'smooth', block: 'start' })
+  }
+}
+
+function handleOpenSource(bookId: string, page: number) {
+  const book = bookStore.books.find(b => b.id === bookId)
+  readerPanel.value = { bookId, page, bookTitle: book?.title }
+  showSources.value = true
+}
+
+async function handleTopicClick(topicId: string) {
+  if (selectedTopicId.value !== topicId) {
+    selectedTopicId.value = topicId
+    topicStore.activeSummary = null
+    summaryError.value = null
+    await topicStore.fetchSummaries(topicId)
+    // Auto-load the latest summary if any exist
+    const list = topicStore.summaryList
+    if (list.length > 0) {
+      await topicStore.fetchSummaryDetail(topicId, list[list.length - 1].id)
+    }
+  }
+}
+
+async function handleLoadSummary(item: SavedSummaryItem) {
+  if (!selectedTopicId.value) return
+  summaryError.value = null
+  await topicStore.fetchSummaryDetail(selectedTopicId.value, item.id)
+}
 
 onMounted(async () => {
   await topicStore.fetchTopics()
+  if (bookStore.books.length === 0) {
+    await bookStore.fetchBooks()
+  }
 })
 
 async function handleGenerate(topicId: string) {
@@ -109,27 +224,122 @@ async function handleGenerate(topicId: string) {
       summaryError.value.toLowerCase().includes('no books') ||
       summaryError.value.toLowerCase().includes('knowledge source')
     showToast?.(summaryError.value, 'error')
+  } else {
+    // Refresh the history list to include the newly saved summary
+    await topicStore.fetchSummaries(topicId)
   }
 }
 
 function formatDate(iso: string): string {
   return new Date(iso).toLocaleString()
 }
+
+function formatDateShort(iso: string): string {
+  return new Date(iso).toLocaleDateString(undefined, { month: 'short', day: 'numeric' })
+}
 </script>
 
 <style scoped>
 .topics-layout {
+  display: flex;
+  gap: 2rem;
+}
+
+.topics-main {
+  flex: 1;
+  min-width: 0;
   display: flex;
   flex-direction: column;
   gap: 2rem;
 }
 
+.reader-panel {
+  margin-top: 1rem;
+  height: 600px;
+  min-height: 400px;
+  border-radius: 10px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
+}
+
 .topic-grid {
   display: grid;
   grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
   gap: 1rem;
 }
 
+/* History panel */
+.history-panel {
+  border-top: 3px solid #805ad5;
+  padding: 1rem;
+}
+
+.history-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 0.75rem;
+}
+
+.history-title {
+  font-size: 0.875rem;
+  font-weight: 600;
+  color: #553c9a;
+}
+
+.btn-sm {
+  font-size: 0.8rem;
+  padding: 0.3rem 0.75rem;
+}
+
+.history-loading {
+  font-size: 0.85rem;
+  color: #718096;
+  display: flex;
+  align-items: center;
+}
+
+.history-empty {
+  font-size: 0.85rem;
+  color: #a0aec0;
+  font-style: italic;
+}
+
+.history-list {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.5rem;
+}
+
+.history-chip {
+  background: #faf5ff;
+  border: 1px solid #d6bcfa;
+  border-radius: 6px;
+  padding: 0.3rem 0.75rem;
+  font-size: 0.8rem;
+  font-weight: 500;
+  color: #553c9a;
+  cursor: pointer;
+  transition: background 0.15s, border-color 0.15s;
+}
+
+.history-chip:hover {
+  background: #e9d8fd;
+  border-color: #b794f4;
+}
+
+.history-chip--active {
+  background: #805ad5;
+  border-color: #805ad5;
+  color: #fff;
+}
+
+.history-chip-date {
+  font-weight: 400;
+  color: inherit;
+  opacity: 0.75;
+}
+
+/* Summary panel */
 .summary-panel {
   border-top: 3px solid #3182ce;
 }
@@ -170,6 +380,22 @@ function formatDate(iso: string): string {
   color: #1a365d;
 }
 
+.summary-meta {
+  display: flex;
+  align-items: baseline;
+  gap: 0.5rem;
+}
+
+.summary-number {
+  font-size: 0.8rem;
+  font-weight: 600;
+  color: #805ad5;
+  background: #faf5ff;
+  border: 1px solid #d6bcfa;
+  border-radius: 4px;
+  padding: 0.1rem 0.4rem;
+}
+
 .summary-timestamp {
   font-size: 0.8rem;
   color: #a0aec0;
@@ -179,10 +405,60 @@ function formatDate(iso: string): string {
   font-size: 0.95rem;
   line-height: 1.7;
   color: #2d3748;
-  white-space: pre-wrap;
   margin-bottom: 1rem;
 }
 
+.summary-text--markdown {
+  white-space: normal;
+}
+
+.summary-text--markdown :deep(h1),
+.summary-text--markdown :deep(h2),
+.summary-text--markdown :deep(h3),
+.summary-text--markdown :deep(h4) {
+  font-weight: 700;
+  margin: 0.75rem 0 0.35rem;
+  line-height: 1.3;
+  color: #1a202c;
+}
+
+.summary-text--markdown :deep(h1) { font-size: 1.15rem; }
+.summary-text--markdown :deep(h2) { font-size: 1.05rem; }
+.summary-text--markdown :deep(h3) { font-size: 0.975rem; }
+.summary-text--markdown :deep(h4) { font-size: 0.925rem; }
+
+.summary-text--markdown :deep(p) { margin: 0.4rem 0; }
+
+.summary-text--markdown :deep(ul),
+.summary-text--markdown :deep(ol) {
+  padding-left: 1.4rem;
+  margin: 0.4rem 0;
+}
+
+.summary-text--markdown :deep(li) { margin: 0.2rem 0; }
+
+.summary-text--markdown :deep(strong) {
+  font-weight: 700;
+  color: #1a202c;
+}
+
+.summary-text--markdown :deep(em) { font-style: italic; }
+
+.summary-text--markdown :deep(code) {
+  background: #edf2f7;
+  border-radius: 3px;
+  padding: 0.1em 0.35em;
+  font-size: 0.87em;
+  font-family: monospace;
+}
+
+.summary-text--markdown :deep(blockquote) {
+  border-left: 3px solid #bee3f8;
+  margin: 0.5rem 0;
+  padding: 0.25rem 0.75rem;
+  color: #4a5568;
+}
+
 .sources-section {
   border-top: 1px solid #e2e8f0;
   padding-top: 0.75rem;
@@ -223,6 +499,20 @@ function formatDate(iso: string): string {
   font-size: 0.8rem;
 }
 
+.source-chip--clickable {
+  cursor: pointer;
+  transition: background 0.15s, border-color 0.15s;
+}
+
+.source-chip--clickable:hover {
+  background: #bee3f8;
+  border-color: #90cdf4;
+}
+
+.source-icon {
+  font-size: 0.8rem;
+}
+
 .source-book {
   color: #2b6cb0;
   font-weight: 500;
@@ -232,6 +522,12 @@ function formatDate(iso: string): string {
   color: #718096;
 }
 
+.source-open-hint {
+  font-size: 0.75rem;
+  color: #3182ce;
+  margin-left: 0.1rem;
+}
+
 .no-sources {
   font-size: 0.85rem;
   color: #a0aec0;
@@ -252,4 +548,31 @@ function formatDate(iso: string): string {
   color: #3182ce;
   text-decoration: underline;
 }
+
+.summary-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 6rem;
+  border-top-color: #cbd5e0;
+}
+
+.summary-placeholder-text {
+  font-size: 0.95rem;
+  color: #a0aec0;
+  font-style: italic;
+}
+
+.summary-text--markdown :deep(.source-ref) {
+  color: #3182ce;
+  font-weight: 600;
+  cursor: pointer;
+  border-radius: 3px;
+  padding: 0 0.15em;
+}
+
+.summary-text--markdown :deep(.source-ref:hover) {
+  background: #ebf8ff;
+  text-decoration: underline;
+}
 </style>