feat(books): plant 心經 and 源氏物語 as the third and fourth books

[cubxxw]

Summary

Plants two new books on the shelf alongside 道德經 and 金剛經, using the existing Book shape in src/books/types.ts — no schema changes, no new components, no routing changes. The current main (with the PR #1 金剛經 merge) already gave us everything needed: Bookshelf, BookDetail, Reading, theme.css, Header, useNightMode, and a Book type rich enough to carry biography + reading strata.

• 心經 (src/books/xinjing.ts) — 般若 shelf, /book/xinjing
  • 十节传记: 般若类经典的印度成型 · 罗什 402 初译 · 玄奘 649 定本 · 怀仁集王羲之字 · 敦煌无名抄经生 · Edward Conze 1948 校梵本 · 铃木俊隆 1959 定为禅心早课 · Jan Nattier 1992「汉文伪经?」philological reversal (rendered as the special variant-comparison box: 代代相传的说法 vs 那体慧的文献学证据) · 一行禅师 2014 重译 · 2026 today
  • 阅读章: 玄奘定本全篇 — 观自在开经四句 · 色空互即 · 六根六尘 · 心无罣碍 · 揭谛咒, each with 罗什 vs 玄奘 vs modern-reader strata
• 源氏物語 (src/books/genji.ts) — 物語 shelf, /book/genji
  • 十二节传记: 1008 藤原道长调笑 · 平安绘卷 · 1255 河内本编成,两个祖本并立 (rendered as the special box: 青表纸本 vs 河内本) · 本居宣长「物哀」 · 江户源氏香 · Waley 1925 六卷英译 · 谷崎润一郎三度重译 · やまと和纪《浅梦》十四年 · Royall Tyler 2001 · 2008 千年纪 · 2026 today
  • 阅读章: 第一帖桐壺 — 开卷三句 with 定家校本 / Waley / 宣长物哀 / やまと和纪 / 雲隠留白 各层

comingSoon in src/books/registry.ts drops the genji ghost (now planted); lunyu, zhuangzi, meditations remain as honest 待种下 ghosts.

The two books share the reader-ring cast (沈一苇 / 周菡 / 陈拾) already established on 金剛經's rings, so a reader's line can be followed across books later without a name migration.

Why this instead of PRs #3–#8

PRs #3, #4, #5, #6, #7, #8 each attempted a version of "add a second/third book" between mid-July and the design-handoff era, but were all authored before PR #1 (金剛經) merged into main. The 金剛經 merge crystallized src/books/types.ts (with ShelfEntry + BioNode + BioRing + ReadingChapter + StrataLayer + CompareSpan), added src/pages/Bookshelf, BookDetail, Reading, theme.css, and a shared Header + useNightMode. That's exactly the surface those six PRs were trying to build from scratch — each with a different, incompatible Book shape and a different landing/detail page name.

Concretely, on today's main:

• Add 《源氏物语》as a second grown tree in 我的树 #3 (src/books.ts flat file + refactored MyTree): superseded — src/books/ directory + Book type already there.
• Add 源氏物語 (The Tale of Genji) as a fully-implemented book #4 (src/Bookshelf.tsx card grid + src/BookGenji.tsx + src/GenjiReader.tsx): superseded — src/pages/Bookshelf.tsx is already the shared 千年书架 timeline, and its "count of 137 layers" copy would violate the design's "no counts anywhere" rule.
• Add 心经 as a second planted book, with a real bookshelf #5 (competing src/books/types.ts + src/Bookshelf.tsx): superseded — its types.ts has been replaced by a richer schema on main; its shelf design has been replaced by src/pages/Bookshelf.tsx.
• Add 一本经的传记 book-biography page, implemented for 心经 (Heart Sutra) #6 (src/BookBio.tsx + a third types.ts): superseded by src/pages/BookDetail.tsx. Content salvaged: this PR's Nattier-1992 timeline node is the anchor of xinjing.ts's bio.
• Add 源氏物语 book-biography page #7 (hard-coded src/Genji.tsx + duplicate theme.css): superseded — theme.css already exists on main; the hard-coded component wouldn't scale. Content salvaged: all twelve of this PR's biography nodes (1008 藤原道長, 青表纸本 vs 河内本, 本居宣长, 谷崎, やまと和纪, Royall Tyler, 千年纪) form the spine of genji.ts's bio; the three reader rings are lifted verbatim.
• Add 金刚经 book biography page (书籍详情页) #8 (a fourth types.ts + hard-coded src/BookPage.tsx for 金刚经): 金剛經 was merged from PR Add 金剛經 (Diamond Sutra) as a fully-implemented themed book #1's implementation instead. This PR would double-add the same book.

Rather than rebase each PR onto a schema that no longer needs them, this PR harvests the two truly valuable pieces (心经 content from #6, 源氏物语 content from #7) and expresses them in main's existing shape.

I recommend closing #3, #4, #5, #6, #7, #8 with a link back here — @cubxxw. Happy to do that once this lands.

Test plan

• npm run build (tsc -b + vite build) — 46 modules transformed, no type errors, 226 KB JS / 20 KB CSS
• Reviewer: hit / — confirm the 千年书架 axis now shows four live spines (道德經 -400 · 金剛經 200 · 心經 649 · 源氏物語 1008) and three ghost planks (論語 / 莊子 / Meditations)
• Reviewer: hit /book/xinjing — biography reveals on scroll; the 1992 (Nattier) node renders the special comparison box; the today node shows three reader rings
• Reviewer: hit /book/genji — same, with 1255 (河内本) as the fork node
• Reviewer: hit /book/xinjing/read and /book/genji/read — time slider covers the min→max span, sentence-strata drawers unlock at their years