feat: 优化书籍详情页与封面组件，新增默认封面与布局

1.  重构BookCover组件，移除渐变 fallback 逻辑，新增默认封面图片
2.  调整书籍详情页布局，使用Grid组件重构章节列表，优化阅读体验
3.  为简介和章节区域添加滚动容器，优化长内容展示
4.  完善返回按钮样式与页面整体排版

src/components/BookCover.vue

@@ -1,19 +1,13 @@
 <template>
   <div class="book-cover">
-    <img v-if="resolvedSrc" :src="resolvedSrc" :alt="title" />
-    <div v-else class="cover-fallback" :style="{ background: coverGradient(title) }">
-      <span class="cover-spine"></span>
-      <div class="cover-meta">
-        <p class="cover-title">{{ title }}</p>
-        <span class="cover-author">{{ author || "佚名" }}</span>
-      </div>
-    </div>
+    <img :src="resolvedSrc" :alt="title" />
   </div>
 </template>
 
 <script setup lang="ts">
 import { computed } from "vue"
 import { convertFileSrc } from "@tauri-apps/api/core"
+import defaultCover from "@/assets/cover.jpg"
 
 const props = defineProps<{
   title: string
@@ -21,30 +15,13 @@ const props = defineProps<{
   cover?: string
 }>()
 
-const coverGradients = [
-  "linear-gradient(135deg, #667eea, #764ba2)",
-  "linear-gradient(135deg, #f093fb, #f5576c)",
-  "linear-gradient(135deg, #4facfe, #00f2fe)",
-  "linear-gradient(135deg, #43e97b, #38f9d7)",
-  "linear-gradient(135deg, #fa709a, #fee140)",
-  "linear-gradient(135deg, #30cfd0, #330867)",
-  "linear-gradient(135deg, #ff9a9e, #fecfef)",
-  "linear-gradient(135deg, #a18cd1, #fbc2eb)",
-]
-
-const coverGradient = (title: string) => {
-  let hash = 0
-  for (let i = 0; i < title.length; i++) {
-    hash = (hash * 31 + title.charCodeAt(i)) >>> 0
-  }
-  return coverGradients[hash % coverGradients.length]
-}
-
 const resolvedSrc = computed(() => {
   const cover = props.cover
-  if (!cover) return ""
-  if (/^(https?:|data:|blob:|asset:)/.test(cover)) return cover
-  return convertFileSrc(cover)
+  if (cover) {
+    if (/^(https?:|data:|blob:|asset:)/.test(cover)) return cover
+    return convertFileSrc(cover)
+  }
+  return defaultCover
 })
 </script>
 
@@ -63,52 +40,4 @@ const resolvedSrc = computed(() => {
     display: block;
   }
 }
-
-.cover-fallback {
-  position: relative;
-  width: 100%;
-  height: 100%;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  padding: 16px 12px;
-  color: #fff;
-  text-align: center;
-}
-
-.cover-spine {
-  position: absolute;
-  left: 0;
-  top: 0;
-  bottom: 0;
-  width: 8px;
-  background: rgba(0, 0, 0, 0.18);
-}
-
-.cover-meta {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  gap: 8px;
-}
-
-.cover-title {
-  font-size: 14px;
-  font-weight: 700;
-  line-height: 1.4;
-  display: -webkit-box;
-  -webkit-line-clamp: 3;
-  -webkit-box-orient: vertical;
-  overflow: hidden;
-  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
-}
-
-.cover-author {
-  font-size: 12px;
-  opacity: 0.85;
-  display: -webkit-box;
-  -webkit-line-clamp: 1;
-  -webkit-box-orient: vertical;
-  overflow: hidden;
-}
 </style>

src/types/components.d.ts

@@ -24,6 +24,8 @@ declare module 'vue' {
     NEmpty: typeof import('naive-ui')['NEmpty']
     NForm: typeof import('naive-ui')['NForm']
     NFormItem: typeof import('naive-ui')['NFormItem']
+    NGi: typeof import('naive-ui')['NGi']
+    NGrid: typeof import('naive-ui')['NGrid']
     NIcon: typeof import('naive-ui')['NIcon']
     NInput: typeof import('naive-ui')['NInput']
     NLayout: typeof import('naive-ui')['NLayout']

src/views/BookDetail.vue

@@ -1,14 +1,13 @@
 <template>
   <div class="book-detail">
-    <section class="detail-header">
-      <div class="header-toolbar">
-        <n-button quaternary circle aria-label="返回" @click="goBack">
-          <template #icon>
-            <n-icon :component="ArrowLeftOutlined" />
-          </template>
-        </n-button>
-      </div>
+    <n-button class="back-btn" quaternary circle aria-label="返回" @click="goBack">
+      <template #icon>
+        <n-icon :component="ArrowLeftOutlined" />
+      </template>
+    </n-button>
 
+    <n-scrollbar class="page-scrollbar">
+    <section class="detail-header">
       <div class="book-summary">
         <div class="summary-cover">
           <BookCover :title="book?.title ?? ''" :author="book?.author" :cover="book?.cover" />
@@ -25,7 +24,9 @@
             <n-descriptions-item label="上次阅读">{{ formatTime(book?.last_read_time) }}</n-descriptions-item>
             <n-descriptions-item label="阅读进度">{{ readProgress }}</n-descriptions-item>
             <n-descriptions-item label="简介" :span="2">
-              <div class="intro-content">{{ book?.introduction || "暂无简介" }}</div>
+              <n-scrollbar class="intro-scrollbar">
+                <div class="intro-content">{{ book?.introduction || "暂无简介" }}</div>
+              </n-scrollbar>
             </n-descriptions-item>
           </n-descriptions>
         </div>
@@ -42,15 +43,22 @@
 
       <n-scrollbar class="chapter-scrollbar">
         <n-spin :show="loadingChapters">
-          <n-list hoverable class="chapter-list">
-            <n-list-item v-for="ch in chapterList" :key="ch.id">
+          <n-grid
+            v-if="chapterList.length > 0"
+            class="chapter-grid"
+            :cols="2"
+            :x-gap="16"
+            :y-gap="6"
+            responsive="screen"
+          >
+            <n-gi v-for="ch in chapterList" :key="ch.id">
               <div class="chapter-item">
                 <span class="chapter-index">{{ ch.number }}</span>
-                <span class="chapter-title">{{ ch.title }}</span>
+                <span class="chapter-title" :title="ch.title">{{ ch.title }}</span>
                 <span class="chapter-chars">{{ ch.total_chars }} 字</span>
               </div>
-            </n-list-item>
-          </n-list>
+            </n-gi>
+          </n-grid>
           <n-empty
             v-if="!loadingChapters && chapterList.length === 0"
             class="chapter-empty"
@@ -72,6 +80,7 @@
         />
       </div>
     </section>
+    </n-scrollbar>
   </div>
 </template>
 
@@ -164,25 +173,47 @@ onMounted(() => {
 
 <style lang="scss" scoped>
 .book-detail {
-  height: 90%;
+  position: relative;
+  height: 93%;
   display: flex;
   flex-direction: column;
   overflow: hidden;
   padding: 20px 24px;
 }
 
+.back-btn {
+  position: absolute;
+  top: 8px;
+  left: 24px;
+  z-index: 10;
+  background-color: var(--color-surface);
+  box-shadow: var(--shadow-card);
+  transition: box-shadow 0.2s ease, background-color 0.2s ease;
+
+  &:hover {
+    box-shadow: var(--shadow-card-hover);
+  }
+}
+
+.page-scrollbar {
+  flex: 1;
+  min-height: 0;
+
+  :deep(.n-scrollbar-container) {
+    height: 100%;
+  }
+
+  :deep(.n-scrollbar-content) {
+    min-height: 100%;
+  }
+}
+
 .detail-header {
-  flex-shrink: 0;
   display: flex;
   flex-direction: column;
   gap: 12px;
 }
 
-.header-toolbar {
-  display: flex;
-  align-items: center;
-}
-
 .book-summary {
   display: flex;
   gap: 20px;
@@ -216,9 +247,19 @@ onMounted(() => {
   text-overflow: ellipsis;
 }
 
+.intro-scrollbar {
+  height: 120px;
+
+  :deep(.n-scrollbar-container) {
+    height: 100%;
+  }
+
+  :deep(.n-scrollbar-content) {
+    padding-right: 8px;
+  }
+}
+
 .intro-content {
-  max-height: 120px;
-  overflow-y: auto;
   line-height: 1.6;
   font-size: 13px;
   color: var(--color-text-secondary);
@@ -231,10 +272,9 @@ onMounted(() => {
 }
 
 .chapter-section {
-  flex: 1;
-  min-height: 0;
   display: flex;
   flex-direction: column;
+  min-height: 0;
 }
 
 .chapter-header {
@@ -257,8 +297,7 @@ onMounted(() => {
 }
 
 .chapter-scrollbar {
-  flex: 1;
-  min-height: 0;
+  max-height: 420px;
 
   :deep(.n-scrollbar-container) {
     height: 100%;
@@ -272,13 +311,20 @@ onMounted(() => {
 .chapter-item {
   display: flex;
   align-items: center;
-  gap: 12px;
+  gap: 10px;
   width: 100%;
+  padding: 8px 10px;
+  border-radius: var(--radius-sm);
+  transition: background-color 0.2s ease;
+
+  &:hover {
+    background-color: var(--color-surface-hover);
+  }
 }
 
 .chapter-index {
   flex-shrink: 0;
-  min-width: 40px;
+  min-width: 32px;
   color: var(--color-text-secondary);
   font-size: 13px;
 }