2.27.0-beta.4

Summary

• migrate image cache payloads to Blob-backed v2 stores while preserving drawing backups
• avoid cache-hit payload rewrites, first-read timeouts, redundant sizing/hashing, and unnecessary deferred validation work
• publish cached/direct assets before uncached generated drawings
• skip duplicate component SVG normalization only for host-certified Excalidraw drawings
• update the exact component dependency to 0.18.125 and document cache/diagnostic workflow

What's Changed

• Improve embedded scene loading performance by @zsviczian in #2896

Full Changelog: 2.27.0-beta.3...2.27.0-beta.4