fix: improve slide-list overview preview sizing (#399)

[igoroctaviano]

Summary

• Fixes slide-list preview sizing when THUMBNAIL or large OVERVIEW images use the full-slide TotalPixelMatrix extent but the rendered PNG is much smaller (Heuristic for sizing overview needs improvements #399).
• Adds computeOverviewPreviewResizeFactor to derive OverviewImageViewer.resizeFactor from the 100px preview tile and matrix dimensions (replaces the removed fixed 0.3 thumbnail heuristic from fix: Thumbnail fallback and multiple thumbnail using dicom tag browser #340).
• Defers viewer mount until the preview container is laid out, then keeps the map sized via ResizeObserver.
• Adds client-side overview mini-map clamping (clampOverviewMapInViewport) for the volume viewer until the published DMV bundle includes the same sizing fix.
• Fixes mangled series UIDs from nested antd Menus and replaces nested slide Menu with a plain list.

Root cause

With resizeFactor: 1, DMV builds an extent from the full matrix while retrieveInstanceRendered returns a small overview/thumbnail PNG — the preview shows a tiny image or fails to fit the tile.

Related

• Companion to ImagingDataCommons/dicom-microscopy-viewer#266 (DMV overview sizing + integer viewport rounding). After that PR is published, bump the dicom-microscopy-viewer dependency in Slim; the client-side clamp can remain as a safety net or be simplified.

Test plan

• Unit tests for computeOverviewPreviewResizeFactor, recoverSeriesInstanceUID, and fitOverviewMapSize
• tsc --noEmit and biome check
• Slide list: https://andrey-slim-test.web.app/studies/2.25.243635437123528859218332833285423941731/series/1.3.6.1.4.1.5962.99.1.3205152386.1735416465.1639587724930.2.0
• Slide list: https://andrey-slim-test.web.app/studies/2.25.68707238542984918932186646266538960593/series/1.3.6.1.4.1.5962.99.1.1861242316.418152757.1638243814860.2.0
• Confirm OVERVIEW and THUMBNAIL fallbacks both fill the preview tile
• Volume viewer: tall/wide slides — overview mini-map usable and aligned with toolbar

Closes #399

[deepsource-io]

DeepSource Code Review

We reviewed changes in 7751f2b...b7a3717 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

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PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
JavaScript		Jul 15, 2026 6:51p.m.	Review ↗

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[github-actions]

Visit the preview URL for this PR (updated for commit b7a3717):

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[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.2% Duplication on New Code

See analysis details on SonarQube Cloud