feat(ui): content-first shelf redesign — responsive cover grid, hover overlays, format badges, skeletons, sticky blurred top bar, brand login, SVG icon set, animated toasts

docs/CHANGELOG_web.md

@@ -28,6 +28,9 @@ The format loosely follows Keep a Changelog and can be adapted to the team's hab
 
 ### Changed / 变更
 
+- Shelf rebuilt into a content-first library UI: responsive cover grid (auto-fill 3:4 posters) with hover overlays for pages/size, color-coded format badges, in-cover progress bars, staggered entrance animations, skeleton loading, and dedicated empty/error/searching states; 继续阅读 is now a horizontal resume strip (cover + progress + library); library filter became a segmented pill bar with an icon search field in a sticky blurred top bar (brand mark, admin nav pills, user chip, icon logout); login got a brand card with icon-adorned inputs; toasts animate with icons; missing covers render a serif-initial placeholder instead of an endless pulse.
+- 书架重构为「内容优先」的现代书库界面：响应式封面网格（自适应列宽、3:4 海报），悬停显示页数/大小浮层、格式彩色徽章、封面内嵌进度条、卡片错峰入场动画、骨架屏加载与空/错/搜索无结果专属状态；「继续阅读」改为横向续读卡片条（封面+进度+所属库）；库筛选变成分段 pill，搜索框带图标并移入毛玻璃吸顶顶栏（品牌标、管理导航 pill、用户胶囊、图标退出）；登录页升级为主视觉卡片与带图标输入框；Toast 带动画与图标；无封面书籍以衬线首字占位，不再无限脉冲。
+
 - .txt chapter splitting no longer recognizes volumes: 「第X卷/部」 lines stay plain body text and volume-only books fall back to pseudo-sections as before; chapter switching moves from the dropdown to a 目录 sidebar overlay that highlights the current chapter, scrolls it into view, and closes on click-outside or after picking a chapter.
 - .txt 章节切分不再感知卷:「第X卷/部」行只作为正文文本,只有卷的书和以前一样退回伪章节切分;换章从下拉框改为「目录」侧边栏浮层——当前章高亮并自动居中可见,点击空白处或选定章节即收起。
 - Whole UI restyled to a warm library palette (stone surfaces + amber accents, replacing cool zinc + emerald): warmer dark chrome, amber primary buttons/links, hover/press feedback on shelf cards (cover lift + glow), reader header with format badge and blur, pill-style CBZ page indicator, EPUB spread centered like a book page.