Anndata zarr port

[AlexSurtees]

Description

Ports the anndata-zarr plugin from https://github.com/BioNGFF/biongff-viewer

Fixes # (issue)
#58

Type of change

• 🐛 Bug fix (non-breaking change that resolves an issue)
• ✨ New feature (non-breaking change that adds functionality)
• ⚡ Optimisation (non-breaking improvement to performance or efficiency)
• 🧩 Documentation (adds or improves documentation)
• 🧱 Maintenance (refactor, dependency update, CI/CD, etc.)
• 🔥 Breaking change (fix or feature that causes existing functionality to change)

Checklist

• All tests pass (eg. npm test)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)
• Documentation updated (if required)

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[davehorsfall]

@AlexSurtees, can you please share the data/config you've been testing with?

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
viewer/src/io.ts	93.33%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[dannda]

can be tested with
?source=https://uk1s3.embassy.ebi.ac.uk/idr/zarr/v0.5/idr0062A/6001240_labels.zarr&anndata=https://storage.googleapis.com/haniffalab/test/zarr/6001240_labels-anndata.zarr

[LucaAnce]

Hi all! I am trying out the plugin testing the integration with Fractal features. I tested the compatibility with Fractal's Anndata backend for tables and it seems to work nicely for the most part!

The only problem I found was when selecting 'Numerical' type of Observations sometimes it causes the entire viewer to crash. This happens also when testing with the suggested data (?source=https://uk1s3.embassy.ebi.ac.uk/idr/zarr/v0.5/idr0062A/6001240_labels.zarr&anndata=https://storage.googleapis.com/haniffalab/test/zarr/6001240_labels-anndata.zarr) and selecting 'boolean' as the numerical observation to display it crashes with this error:
Uncaught TypeError: Cannot read properties of undefined (reading 'toFixed') at Legend (Legend.jsx:19:43)