[timtreis]

Slack previews of the docs showed no image, because og:image was the SVG logo and Slack doesn't render SVG. The description was also cut mid-word at 200 characters.

Changes in docs/conf.py:

• ogp_image is the website's 1200×630 PNG card, {SITE_URL}/og.png. It follows SITE_URL, so it moves to www with it, and the site-URL test still finds a single source. The card is added to the site in theislab/spatialdata-db-web#81, so merge this after that PR deploys.
• ogp_image_alt, ogp_site_url (https://spatialdata-db.readthedocs.io/en/latest/) and ogp_description_length = 150.
• twitter:card is summary_large_image, added as a custom tag, because sphinxext-opengraph doesn't emit it.

Changes in docs/index.md: an explicit og:description for the home page, in whole sentences (125 characters), "A catalog of public spatial omics datasets as SpatialData Zarr stores, with a Python client to query, download and load them." Other pages keep the automatic 150-character cut.

Checks: 458 tests pass. The docs build passes, and the built index.html carries og:image, og:image:alt, twitter:card and the new og:description.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.67%. Comparing base (7170bfe) to head (445061f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   94.67%   94.67%           
=======================================
  Files          22       22           
  Lines        2291     2291           
=======================================
  Hits         2169     2169           
  Misses        122      122           

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