Fix CJK overflow on story page — still broken after PR #687

[realproject7]

Bug (Image 224)

Chinese/Japanese content still overflows the story page layout on desktop, pushing the sidebar off-screen. PR #687 added `word-break: break-word` to `.ruled-paper` but the issue persists.

Investigation needed

The CSS fix was applied to `.ruled-paper` in globals.css but the content container on the story page may have a parent that doesn't constrain width properly. Check:

1. Does the main content column have `overflow: hidden` or `min-width: 0`?
2. Is the grid layout (`lg:grid-cols-[1fr_320px]`) properly constraining the left column?
3. Does the `.story-markdown` container need the same word-break rules?
4. Test on https://plotlink.xyz/story/40 (Chinese) and https://plotlink.xyz/story/39 (Japanese)

Files to investigate

• `src/app/story/[storylineId]/page.tsx` — grid layout, content column
• `src/app/globals.css` — ruled-paper and story-markdown styles

Branch

`task/711-cjk-overflow-v2`

Self-Verification (T3)

• story/40 (Chinese): content wraps within container, sidebar fully visible
• story/39 (Japanese): same
• English/Korean stories unaffected
• `npm run build` passes