v0.2.1

0.2.1 — 2026-09-10

• Diagram previews are now browser-cacheable: every <img> links the SVG endpoint with
  ?v=<content_hash> and the endpoint answers such requests with
  Cache-Control: private, max-age=31536000, immutable, so a list of 150 diagrams costs 150
  requests once instead of on every page load. Unversioned URLs keep revalidating via ETag.
• The SVG endpoint checks If-None-Match before loading the SVG blob, so a 304 no longer reads
  the diagram out of Postgres.
• List and tab querysets compute svg_size with OCTET_LENGTH instead of LENGTH, which avoids
  decompressing every stored SVG just to test whether a preview exists.