feat(reader): page thumbnails tab + reliable PDF contents

Investigation: the contents drawer read book.toc, which makePDF
builds from pdf.getOutline() — verified against the real library PDF
(Head First SQL) through the exact vendored pdf.js build AND the exact
range transport the browser uses: 18 chapter entries come back. So
the source is right; manga-scan PDFs and CBZs simply have no embedded
outline, which made Contents look broken exactly where users expect
page-based navigation.

- TOC now populates eagerly right after the book opens (toggle-time
  lazy population removed), so an existing outline can never silently
  miss due to timing; the drawer keeps the honest empty-state text
  for books without outlines.
- New 'Pages' tab in the contents drawer for fixed-layout books:
  a Kavita-style thumbnail grid (3-up, current page highlighted and
  scrolled into view, click to jump — recorded on the back-to-
  location stack). Thumbnails render client-side: PDFs via the
  in-memory pdf.js document (small viewport render, Alpine.raw
  unwrap); comics via the page's image blob drawn down to a 110px
  canvas, then unloading the full-size blob so thumbnailling doesn't
  hoard page images. Lazy via IntersectionObserver scoped to the
  drawer's scroll container (200px margin), canvases cached at module
  level so revisits are instant; failures warn in console and allow
  retry. The backend /readers/thumbnails endpoint turned out to be an
  empty stub, so nothing server-side was worth wiring.

templates/reader.templ

@@ -521,8 +521,18 @@ templ drawerHeader(title string) {
 
 templ ReaderTOCDrawer() {
 	@drawerHeader("Contents")
+	<!-- Fixed-layout books get a Pages (thumbnails) tab; outline TOC may be
+	     absent in manga-scan PDFs and CBZs. -->
+	<div class="reader-tabs" x-show="isFixedLayout">
+		<button :class="tocTab === 'contents' ? 'active' : ''" @click="tocTab = 'contents'">
+			Contents <span class="reader-tab-count" x-text="tocItems.length">0</span>
+		</button>
+		<button :class="tocTab === 'pages' ? 'active' : ''" @click="tocTab = 'pages'; initPageThumbs()">
+			Pages <span class="reader-tab-count" x-text="pageThumbList.length || ''">0</span>
+		</button>
+	</div>
 	<div class="reader-drawer-body">
-		<nav id="toc-list" class="space-y-1">
+		<nav id="toc-list" class="space-y-1" x-show="tocTab === 'contents' || !isFixedLayout">
 			<template x-for="item in tocItems" :key="item.href">
 				<a
 					href="#"
@@ -536,6 +546,22 @@ templ ReaderTOCDrawer() {
 				<p class="text-sm py-2" style="color: var(--text-secondary)">No table of contents</p>
 			</template>
 		</nav>
+		<div id="page-thumb-grid" class="reader-thumb-grid" x-show="isFixedLayout && tocTab === 'pages'">
+			<template x-for="p in pageThumbList" :key="p.index">
+				<button
+					class="reader-thumb"
+					:class="p.index === currentPageIndex ? 'active' : ''"
+					@click="goToPage(p.index)"
+					:title="'Page ' + (p.index + 1)"
+				>
+					<div class="reader-thumb-img" :data-page="p.index"></div>
+					<span class="reader-thumb-num" x-text="p.index + 1">1</span>
+				</button>
+			</template>
+			<template x-if="pageThumbList.length === 0">
+				<p class="text-sm py-2" style="color: var(--text-secondary)">No pages</p>
+			</template>
+		</div>
 	</div>
 }
 

templates/reader_templ.go

@@ -357,7 +357,7 @@ func ReaderTOCDrawer() templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 18, "<div class=\"reader-drawer-body\"><nav id=\"toc-list\" class=\"space-y-1\"><template x-for=\"item in tocItems\" :key=\"item.href\"><a href=\"#\" @click.prevent=\"goToTOCItem(item)\" class=\"block py-1 px-2 rounded hover:bg-gray-700 text-sm\" :style=\"'padding-left: ' + ((item.depth || 0) * 1 + 0.5) + 'rem'\" x-text=\"item.label\"></a></template><template x-if=\"tocItems.length === 0\"><p class=\"text-sm py-2\" style=\"color: var(--text-secondary)\">No table of contents</p></template></nav></div>")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 18, "<!-- Fixed-layout books get a Pages (thumbnails) tab; outline TOC may be\n\t     absent in manga-scan PDFs and CBZs. --><div class=\"reader-tabs\" x-show=\"isFixedLayout\"><button :class=\"tocTab === 'contents' ? 'active' : ''\" @click=\"tocTab = 'contents'\">Contents <span class=\"reader-tab-count\" x-text=\"tocItems.length\">0</span></button> <button :class=\"tocTab === 'pages' ? 'active' : ''\" @click=\"tocTab = 'pages'; initPageThumbs()\">Pages <span class=\"reader-tab-count\" x-text=\"pageThumbList.length || ''\">0</span></button></div><div class=\"reader-drawer-body\"><nav id=\"toc-list\" class=\"space-y-1\" x-show=\"tocTab === 'contents' || !isFixedLayout\"><template x-for=\"item in tocItems\" :key=\"item.href\"><a href=\"#\" @click.prevent=\"goToTOCItem(item)\" class=\"block py-1 px-2 rounded hover:bg-gray-700 text-sm\" :style=\"'padding-left: ' + ((item.depth || 0) * 1 + 0.5) + 'rem'\" x-text=\"item.label\"></a></template><template x-if=\"tocItems.length === 0\"><p class=\"text-sm py-2\" style=\"color: var(--text-secondary)\">No table of contents</p></template></nav><div id=\"page-thumb-grid\" class=\"reader-thumb-grid\" x-show=\"isFixedLayout && tocTab === 'pages'\"><template x-for=\"p in pageThumbList\" :key=\"p.index\"><button class=\"reader-thumb\" :class=\"p.index === currentPageIndex ? 'active' : ''\" @click=\"goToPage(p.index)\" :title=\"'Page ' + (p.index + 1)\"><div class=\"reader-thumb-img\" :data-page=\"p.index\"></div><span class=\"reader-thumb-num\" x-text=\"p.index + 1\">1</span></button></template><template x-if=\"pageThumbList.length === 0\"><p class=\"text-sm py-2\" style=\"color: var(--text-secondary)\">No pages</p></template></div></div>")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}

web/src/reader/reader.ts

@@ -18,6 +18,10 @@ const HIGHLIGHT_COLORS = [
   "#ce93d8",
 ];
 
+// Rendered page-thumbnail canvases (page index → canvas). Module-level so
+// Alpine reactivity never wraps it and revisiting pages is instant.
+const thumbCache = new Map<number, HTMLCanvasElement>();
+
 foliateConfig.pdfjsPath = (path) => `/static/vendor/pdfjs/${path}`;
 
 const FONT_MAP: Record<string, string> = {
@@ -418,6 +422,9 @@ document.addEventListener("alpine:init", () => {
     searchError: "",
     searchGen: 0,
     pdfPagesCache: null as PdfPageText[] | null,
+    tocTab: "contents" as string,
+    pageThumbList: [] as { index: number }[],
+    thumbObserver: null as IntersectionObserver | null,
     pdfSearchKeys: [] as string[],
     backStack: [] as { cfi?: string; page?: number }[],
     selectionPopover: {
@@ -591,6 +598,11 @@ document.addEventListener("alpine:init", () => {
       });
       this.renderer = this.view.renderer;
       this.book = this.view.book;
+      // Populate the TOC eagerly (PDF outlines and EPUB TOCs alike) so the
+      // drawer never depends on lazy-toggle timing; toggleTOC only opens.
+      if (this.book?.toc?.length) {
+        this.tocItems = this.flattenTOC(this.book.toc);
+      }
       this.isFixedLayout = this.view.isFixedLayout;
       if (this.isFixedLayout) {
         // Manga/RTL comics: foliate's goLeft/goRight swap on book.dir === "rtl",
@@ -1682,6 +1694,132 @@ document.addEventListener("alpine:init", () => {
         this.tocOpen = false;
       }
     },
+    // ----- page thumbnails (fixed-layout: PDF via pdf.js, comics via the
+    // page image blobs). Lazy-rendered with an IntersectionObserver so only
+    // visible cells pay extraction/render cost. -----
+    get currentPageIndex(): number {
+      return typeof this.renderer?.index === "number" ? this.renderer.index : -1;
+    },
+    initPageThumbs() {
+      if (!this.isFixedLayout || !this.book) return;
+      if (!this.pageThumbList.length) {
+        const sections = (this.book as any).sections ?? [];
+        this.pageThumbList = sections.map((_s: any, i: number) => ({ index: i }));
+      }
+      (this as any).$nextTick(() => {
+        const grid = document.getElementById("page-thumb-grid");
+        if (!grid || this.thumbObserver) {
+          this.resumeThumbObserver();
+          return;
+        }
+        const root = grid.closest(".reader-drawer-body");
+        const io = new IntersectionObserver(
+          (entries) => {
+            for (const entry of entries) {
+              if (!entry.isIntersecting) continue;
+              io.unobserve(entry.target);
+              const page = parseInt(
+                (entry.target as HTMLElement).dataset.page ?? "",
+                10,
+              );
+              if (!isNaN(page)) this.renderPageThumb(page, entry.target as HTMLElement);
+            }
+          },
+          { root: root instanceof Element ? root : null, rootMargin: "200px" },
+        );
+        this.thumbObserver = io;
+        for (const el of Array.from(
+          grid.querySelectorAll<HTMLElement>(".reader-thumb-img"),
+        )) {
+          io.observe(el);
+        }
+        this.scrollToCurrentThumb();
+      });
+    },
+    resumeThumbObserver() {
+      const grid = document.getElementById("page-thumb-grid");
+      if (grid && this.thumbObserver) {
+        for (const el of Array.from(
+          grid.querySelectorAll<HTMLElement>(
+            ".reader-thumb-img:not([data-done])",
+          ),
+        )) {
+          this.thumbObserver.observe(el);
+        }
+      }
+      this.scrollToCurrentThumb();
+    },
+    scrollToCurrentThumb() {
+      const cur = document.querySelector(
+        "#page-thumb-grid .reader-thumb.active",
+      );
+      cur?.scrollIntoView({ block: "center" });
+    },
+    async renderPageThumb(page: number, container: HTMLElement) {
+      if (container.dataset.done) return;
+      container.dataset.done = "1";
+      try {
+        const cached = thumbCache.get(page);
+        if (cached) {
+          container.appendChild(cached);
+          return;
+        }
+        const rawBook = (Alpine as any).raw
+          ? (Alpine as any).raw(this.book)
+          : this.book;
+        if (this.isPDF && rawBook?.pdf) {
+          const pdfPage = await rawBook.pdf.getPage(page + 1);
+          const base = pdfPage.getViewport({ scale: 1 });
+          const scale = 110 / base.width;
+          const viewport = pdfPage.getViewport({ scale });
+          const canvas = document.createElement("canvas");
+          canvas.width = Math.ceil(viewport.width);
+          canvas.height = Math.ceil(viewport.height);
+          await pdfPage.render({
+            canvasContext: canvas.getContext("2d")!,
+            viewport,
+          }).promise;
+          thumbCache.set(page, canvas);
+          container.appendChild(canvas);
+        } else {
+          // Comic: section.load() yields a page-document blob URL; extract
+          // the embedded image URL, draw it small, then free the full-size
+          // blob (unload) so thumbnailing doesn't hoard page images.
+          const section = rawBook?.sections?.[page];
+          const url = await section?.load?.();
+          if (!url) return;
+          const html = await (await fetch(url)).text();
+          const m = html.match(/src="(blob:[^"]+)"/);
+          if (!m) return;
+          const img = new Image();
+          await new Promise<void>((res, rej) => {
+            img.onload = () => res();
+            img.onerror = () => rej(new Error("img load"));
+            img.src = m[1];
+          });
+          const scale = 110 / (img.naturalWidth || 1);
+          const canvas = document.createElement("canvas");
+          canvas.width = 110;
+          canvas.height = Math.round((img.naturalHeight || 150) * scale);
+          canvas.getContext("2d")!.drawImage(img, 0, 0, canvas.width, canvas.height);
+          thumbCache.set(page, canvas);
+          container.appendChild(canvas);
+          // Free the full-size page blob unless it's the page on screen
+          // (revoking a URL an iframe already loaded is harmless, but the
+          // current page may be re-requested on re-render).
+          if (this.renderer?.index !== page) section.unload?.();
+        }
+      } catch (e) {
+        delete container.dataset.done;
+        console.warn("thumbnail render failed for page", page + 1, e);
+      }
+    },
+    goToPage(index: number) {
+      if (!this.view || typeof index !== "number" || index < 0) return;
+      this.pushBackStack();
+      this.view.goTo(index);
+      this.tocOpen = false;
+    },
     goToBookmark(item: { cfi: string; page: number | null }) {
       if (!this.view) return;
       if (item.cfi) {

web/static/input.css

@@ -1029,6 +1029,51 @@
     background-color: color-mix(in srgb, currentColor 6%, transparent);
   }
 
+  /* Page thumbnails grid (contents drawer, fixed-layout) */
+  .reader-thumb-grid {
+    display: grid;
+    grid-template-columns: repeat(3, 1fr);
+    gap: 0.5rem;
+  }
+  .reader-thumb {
+    position: relative;
+    border-radius: 0.375rem;
+    overflow: hidden;
+    border: 2px solid transparent;
+    padding: 0;
+    background-color: color-mix(in srgb, currentColor 6%, transparent);
+  }
+  .reader-thumb:hover {
+    border-color: color-mix(in srgb, currentColor 30%, transparent);
+  }
+  .reader-thumb.active {
+    border-color: #3b82f6;
+  }
+  .reader-thumb-img {
+    aspect-ratio: 3 / 4;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    overflow: hidden;
+  }
+  .reader-thumb-img canvas,
+  .reader-thumb-img img {
+    max-width: 100%;
+    max-height: 100%;
+    object-fit: contain;
+  }
+  .reader-thumb-num {
+    position: absolute;
+    bottom: 0.2rem;
+    right: 0.35rem;
+    font-size: 0.65rem;
+    line-height: 1;
+    padding: 0.15rem 0.3rem;
+    border-radius: 0.25rem;
+    background-color: rgba(0, 0, 0, 0.55);
+    color: #ffffff;
+  }
+
   /* In-book search */
   .reader-search-bar {
     display: flex;

web/static/style.css

@@ -1,2 +1,2 @@
 *,:after,:before{--tw-border-spacing-x:0;--tw-border-spacing-y:0;--tw-translate-x:0;--tw-translate-y:0;--tw-rotate:0;--tw-skew-x:0;--tw-skew-y:0;--tw-scale-x:1;--tw-scale-y:1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness:proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-color:rgba(59,130,246,.5);--tw-ring-offset-shadow:0 0 #0000;--tw-ring-shadow:0 0 #0000;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }::backdrop{--tw-border-spacing-x:0;--tw-border-spacing-y:0;--tw-translate-x:0;--tw-translate-y:0;--tw-rotate:0;--tw-skew-x:0;--tw-skew-y:0;--tw-scale-x:1;--tw-scale-y:1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness:proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-color:rgba(59,130,246,.5);--tw-ring-offset-shadow:0 0 #0000;--tw-ring-shadow:0 0 #0000;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }
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