fix(report): draw North Indian charts from fences after skipHtml dropped SVG

Longform report pages kept the D1/D9/Moon and varga headings but skipHtml
stripped the engine's inline SVG. Emit a jyotish-chart JSON fence beside
each SVG and render a diamond chart on the reader without relaxing HTML
sanitization. BUG-607.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/DESIGN.md

@@ -357,6 +357,7 @@ Text release is paced, not animated: the frame buffer commits at most once per a
 - **Structure:** sticky screen chrome (back, secondary print, primary “导出报告（.md）”), then the longform Markdown body with a sticky heading TOC. 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”.
 - **Surface:** page floor `--color-canvas-soft`; the Markdown article is a `--color-canvas` sheet with a hairline and `--radius-lg`. Print flattens the sheet, hides chrome and the TOC, and pins the light palette.
 - **Typography:** Markdown `h2` uses `--type-display-sm` serif at weight 400. `h3` uses `--type-title-md` sans at weight 500. Body is `--type-body-md` at 1.65. Honesty labels (`blocked` / `conflict` / `parameter_sensitive`) stay visible; the reading-nav and quality-matrix sections are not collapsed.
+- **Charts:** each `####` chart heading is followed by a North Indian diamond figure, not engine SVG HTML. Figures are max 360px and centered. From 720px, consecutive heading+figure pairs sit two to a row; print and narrower viewports stay one column. Occupants are one-character Chinese names plus integer degree (`日 12°`), with `逆` after the name when retrograde (`土逆 3°`). House corners show rasi numbers 1–12. Chart JSON fences are stripped from the `.md` download. Markdown still uses `react-markdown` + `remark-gfm`, `skipHtml`, and no `rehype-raw`.
 - **Accent:** headings stay ink. Dark ink is never a page-scale rule or card edge.
 - **Tables:** wide Markdown tables sit in `overflow-x: auto` wrappers; print unwraps them.
 - **Width:** 1120px for the reader chrome so the TOC rail can sit beside the article; the TOC stacks into a drawer below 860px.