feat(web): cap markdown table column width at 700px

[wbxl2000]

Related Issue

None — the problem is explained below. Follow-up to #1577.

Problem

After #1577, a wide markdown table grows with its content up to 1040px. But a table does not need many columns to become wide: a single cell holding long prose (a description column, a pasted log line, a long URL list) stretches its column without bound, dragging the whole table past the reading column and forcing horizontal scrolling where simple wrapping would read better.

What changed

• New layout token --p-table-cell-max: 700px in src/style.css, next to --p-table-max.
• .table-node th/td in Markdown.vue get max-width: var(--p-table-cell-max): under the stage-1 table-layout: auto, the column stops growing at 700px and the cell content wraps. markstream's cells already use white-space: normal + overflow-wrap: break-word, so wrapping — including long unbroken strings — is native and no wrap override is needed.
• Narrow tables are unaffected (their columns never reach 700px), and many-column tables still grow to --p-table-max and scroll inside their wrapper beyond it.
• Design-system view updated: token row for --p-table-cell-max and the §04 wide-table paragraph. Changeset included.

Verification: pnpm --filter @moonshot-ai/kimi-web typecheck, check:style, build, and git diff --check all pass. Runtime acceptance (long single-cell table wraps at 700px; 20-column table unchanged; mobile unchanged) is manual in the browser; this package has no component-test harness.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 567b578

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@moonshot-ai/kimi-code	Patch

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commit: 567b578