SPA URLs (/, /home/…, /login/…) are rewritten to /index.html inside
location /, which set no cache headers, so browsers heuristically reused
a stale shell after a deploy, and rsync --delete had just removed the
assets it referenced: a blank app until the shell expired. Send
no-cache for the rewritten shell (map on $uri; location / now includes
the security headers, since add_header drops the inherited ones), and
stop deleting previous builds' hashed assets: prune after 14 days.
Fixes#23
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5