feat(reports): redesign the export sheet — edition, whole or chosen chapters, size on the button

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

frontend/DESIGN.md

@@ -581,8 +581,8 @@ one skeleton, none of them carrying the sidebar.
 ### Personal report reader
 
 - **Buttons on the report surfaces:** the BUG-1078 report-only override (2026-09-28) was replaced the same day by the site-wide solid-button pair (BUG-1079, see Button); report buttons look as before. Outline buttons there (the header 「生成报告」 while submitting) now fade like outline buttons elsewhere instead of the report-only grey. The selected export preset is `--color-canvas-muted` + `--color-ink` + a `--color-ink-secondary` edge, not the `--color-action-soft` fill (a red-brown block in dark mode).
-- **分块导出对话框 (2026-09-24):** native modal `<dialog>`, bottom-aligned below 860px and centered at ≥860px, app colours only. Desktop is viewport-centered (`inset: 0; margin: auto`) regardless of sidebar state, width `min(720px, 92vw)`, max-height 80vh, with full `--radius-lg` corners. Its flex panel is capped at `calc(80vh - 2px)` to reserve the dialog border; desktop rules follow the narrow-screen dvh upgrade so 70dvh cannot override them. Below 860px the content-column offset, bottom alignment and at most 85vh/85dvh (70 until 2026-09-30, BUG-1107) remain unchanged. Header and single export footer stay visible; the block list scrolls, two columns at the existing 860px breakpoint. Escape, backdrop or 关闭 dismisses; focus returns without scrolling. All controls have 44px targets. No spinner, clipboard or extra fetch.
-- **Export selection:** default 常用 selects every body block from the single outline's lossless source slices (lead = 摘要); 全部分盘 and 仅核对表 replace the selection. Manual toggles clear preset highlighting. 全选 / 取消全选 works across all groups; zero selected disables export. Counts are actual Unicode code points in serialized block text, including SVG markup, not approximate prose counts. Beside them the header shows the file size for the whole report and for the selection — the UTF-8 byte length of exactly what would download (`TextEncoder` over `joinExportBlocks`), as 「约 186 KB」 / 「约 1.4 MB」, never a per-character estimate.
+- **导出报告 sheet (redesigned 2026-09-30, product: 「分块导出太丑」):** native modal `<dialog>`, bottom sheet below 860px (up to 85dvh) and a centred `min(520px, 92vw)` panel at ≥860px, app colours only. Top to bottom: title 「导出报告」 with a × (读屏名「关闭导出」); when the report has an English edition, a two-way segment 中文 / English (starts on the edition being read, does not switch the page) with one caption 「拿去问 ChatGPT、Claude 等 AI，建议选 English，术语与原典一致。」, otherwise one caption saying why there is no English; two radio cards 「整篇报告」 (subline counts 章正文 / 张分盘 / 张核对表) and 「自选章节」; only in 自选, a plain checklist grouped 正文 / 分盘 / 核对表, each group one tri-state checkbox (✓ / − / empty) plus a chevron, 正文 open and the other groups folded. Rows are borderless 44px lines, no per-block character counts. The file size appears once, on the footer button: 「导出整篇 · 约 195 KB」 / 「导出 6 项 · 约 80 KB」 / disabled 「先勾选要导出的部分」. Selected states use `--color-canvas-muted` + `--color-ink`, never `--color-action-soft` (BUG-1078). Escape, backdrop or × dismisses; focus returns without scrolling. No spinner, clipboard or extra fetch.
+- **Export selection:** 整篇 = every block of the chosen edition; 自选 starts with all 正文 chapters ticked. Switching the sheet's language resets the checklist to that edition's chapters (block ids differ per edition). Presets 常用 / 全部分盘 / 仅核对表 and 全选 were retired with the redesign.
 - **Export content:** full body alone remains byte-identical to the retired ordinary Markdown export. Selected chart/table blocks append new content; selecting all groups is not byte-identical to body-only. D13 requires safe SVG in each chart, reusing the projected engine SVG or the existing hook-free Vedic drawing; offline fallback uses readable monochrome glyphs/legend and presentation attributes. No chart JSON fences or internal audit fields. Fact-table labels/precision/subtables match the reader. Full body uses the historical filename; excerpt adds `-节选`. The existing downloader appends `.md`.
 
 - **Structure:** inside the app shell, like every other secondary page — `/reports/[reportId]` was the last standalone full-screen route, and opening a report used to drop the reader out of the app entirely. 「个人报告」 sits in the 46px header; below it the reader owns its own scroll boundary, carrying the sticky screen chrome (back and the labelled 「导出」 button) and then the longform Markdown body beside a persistent TOC rail. Every phase — loading, generating, timed-out, and each error — renders inside the same shell, so the way back is always the rail. The five-chapter writer document is storage-only and is not rendered. Reports without Markdown show “旧版本报告，请重新生成”.