[NickAkhmetov]

Summary

Fixes three issues QA found after the MUI 9 upgrade (#4082), plus one older bug on the organ page. None of the three QA issues is caused by MUI 9 itself.

• Cell population plot reloads when the cell types section switches to ATACseq. The ATACseq tab mounts its table only when it is selected. Its useIndexedDatasetsForOrgan call then revalidates the Elasticsearch query that the plot shares. Every hit in that query has the same score, so Elasticsearch can return the hits in a different order on each request. The plot builds its scFind count request keys from that list in order, so a new order meant new keys, a refetch and the loading skeleton. useIndexedDatasetsForOrgan's query now sorts by _id.
• Bulk data transfer tab contents do not fill the section. StyledTabPanel is a row flexbox, so its child was only as wide as its content. Production has the same CSS but a narrower main column, so the gap did not show there. Children of the panel now get flexGrow: 1. The Collections and Publications sections had their own workarounds for this, and those are now redundant. I left them in place.
• Section description info icon is misaligned with the text. The icon now sits in a body1 line box with vertical-align: middle, so it centers on the first line of text. This replaces the marginTop offset on the text. The icon also looks lower in QA for a separate reason: from NickAkhmetov/CAT-1550 Say and See Front-end Integration / Back-end Enhancements #3983 until NickAkhmetov/Update Say & See to udi-yac 0.9.0, fix chart field changes #4111, udi-yac's stylesheet applied a Tailwind preflight rule, svg { vertical-align: middle }, to every icon in the app. NickAkhmetov/Update Say & See to udi-yac 0.9.0, fix chart field changes #4111 scoped that rule to .udi-yac, so icons went back to baseline. This PR does not restore the global rule.
• "View Datasets" in the organ cell types table links to every dataset. The table's matched datasets are already UUIDs, but useUUIDsFromHubmapIds looked them up by hubmap_id.keyword. No document matched, so the button got an empty UUID filter and the search showed all datasets. The cell now uses the existing useSCFindIDAdapter, which accepts both UUIDs and HuBMAP IDs. I deleted useUUIDsFromHubmapIds, which had no other callers.

Design Documentation/Original Tickets

N/A. These came from QA of the MUI 9 upgrade (#4082).

Testing

Check	Result
pnpm test	1060 passed, 7 skipped (146 files)
pnpm tsc	clean
ESLint on changed files	clean

Manual checks against a local dev server:

• /organs/lung: switching the cell types tabs from ATACseq to RNAseq and back no longer refetches cell-type-count or reloads the plot.
• Bulk data transfer on a raw RNAseq dataset (HBM965.GWBH.574): the RNAseq and Salmon tab contents now fill the panel (1392px). Before, the Salmon tab content was 1245px.
• Section description icons, both subsection and full size: the icon's top is about 2px above the cap height of the first line of text.
• /organs/lung, "adventitial fibroblast" row (27/45): "View Datasets" now opens a search with 27 results. Before, it showed all 9,727 datasets.

Screenshots/Video

N/A

Checklist

• Code follows the project's style guidelines
• Changelog entry added (CHANGELOG-mui-9-qa-followups.md)

🤖 Generated with Claude Code

[john-conroy]

Should we not just apply a sort in the ES query?

[NickAkhmetov]

Yes, that's simpler. Done in 2e38f43: the query now has sort: [{ _id: 'asc' }], the same as the shared ID queries in useSearchData.ts, and the client-side .sort() is gone.