fix: 书库阅读页/帖子详情页/SiteDocMasthead/TOC 等前端细节修复

frontend/app/library/[slug]/read/page.tsx

@@ -16,7 +16,7 @@ import {
   groupSections,
   type ChapterNav,
 } from "@/lib/librarySections";
-import { extractToc, estimateReadingMinutes, markdownHeadingToc, buildTocFromSegments } from "@/lib/toc";
+import { extractToc, estimateReadingMinutes, formatReadingDuration, markdownHeadingToc, buildTocFromSegments } from "@/lib/toc";
 import { splitContentSegments } from "@/lib/directiveBlocks";
 import { wrapImplicitEntries } from "@/lib/entryBlocks";
 import PostToc, { type TocItem } from "@/components/PostToc";
@@ -223,7 +223,7 @@ export default async function LibraryReadPage({ params, searchParams }: PageProp
               {current.title}
             </p>
             <p className="meta mt-0.5 text-[10.5px] leading-tight">
-              第 {nav.index + 1} / {nav.total} 章 · 约 {chapterMinutes} 分钟
+              第 {nav.index + 1} / {nav.total} 章 · 约 {formatReadingDuration(chapterMinutes)} 读完
             </p>
           </>
         }
@@ -265,7 +265,7 @@ export default async function LibraryReadPage({ params, searchParams }: PageProp
               <header>
                 <div className="flex items-center justify-between gap-3">
                   <p className="meta text-[12px]">
-                    第 {nav.index + 1} / {nav.total} 章 · 约 {chapterMinutes} 分钟
+                    第 {nav.index + 1} / {nav.total} 章 · 约 {formatReadingDuration(chapterMinutes)} 读完
                   </p>
                   <BookSearch
                     slug={d.slug}