fix(traces): keep the sticky table header above the Trace ID links

[JeremyFunk]

The Trace ID link is relative z-10 (to sit above the row's stretched link), the same level as the sticky thead, so later rows painted over the header while scrolling. Raise the header to z-20.

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Summary by CodeRabbit

• Bug Fixes
  • Improved the traces table’s sticky header layering. While scrolling, the header now appears above the table content, making it easier to keep column labels in view as you move through the rows.

[maple-review-bot]

Maple review

🟢 Confidence 5/5 · safe to merge
_{quality 100/100 · no findings · tests not needed · risk low}

Raises the sticky traces table header from z-10 to z-20 so scrolled rows no longer paint over it. A one-class CSS fix, safe to merge.

What was checked

• Row tr is relative with no z-index, so the Trace ID link's z-10 (traces-table.tsx:266) compares directly against the header's new z-20
• Grepped apps/web/src/components/traces for other z-10..z-50 elements inside the same scroll container: only the span detail panel's sticky tabs, a separate panel

_{5be79ee · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}

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• apps/web/src/components/traces/traces-table.tsx

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