Fix overlapping headers in scrollable atlas tables

[Alejandro Lopez (soyalejolopez)]

Category

• Bug fix
• New script
• New sample

Related Issues

N/A

What's in this Pull Request?

Fixes overlapping sticky headers in the Agent 365 Lifecycle Atlas tables inside horizontally scrollable diagram wrappers. The global table.grid th rule keeps its top: 56px offset for the three page-level tables, while .diagram-scroll table.grid th { top: 0 } scopes scrollable atlas tables to their wrapper so the first row remains visible.

This is a CSS-only public fix with no product fact, SVG, catalog row, source, license, credit, or publication-date changes. The resource version is updated from 1.2.0 to 1.2.1, with a matching changelog entry.

Validation:

• npm run check --prefix tools\catalog-build
• Frozen HTML SHA-256: 2C4C3C677876D693F812993E2B16BD6BB9557C9C6A2877B1B504198EC38D12FD
• Removing the one added CSS line restores published baseline SHA-256 3289578637FC1F66352532B6FD241185317596E582A97E3A42B918CB2C4879FA
• Structural counts preserved: 12 SVGs, 18 catalog rows, 36 sources, and 88 unique IDs

[github-actions]

🛰️ PR Sweeper report

Risk: 🟢 LOW · Security gate: ✅ passing · Files: 3

🔒 Automated guardrails (authoritative)

No secret, PII, file-policy, or scope issues detected. ✅

🤖 Dual-model AI review (advisory)

AI review unavailable for this run (models not reachable or no diff). Guardrails above are unaffected.

• GPT-class reviewer (openai/gpt-5): skipped — GitHub Models HTTP 410: {"error":{"code":"github_models_retirement_brownout","message":"GitHub Models is temporarily unavailable as part of a scheduled retirement brownout."}}

• Deep-reasoning reviewer (openai/o3): skipped — GitHub Models HTTP 410: {"error":{"code":"github_models_retirement_brownout","message":"GitHub Models is temporarily unavailable as part of a scheduled retirement brownout."}}

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