chore(release): v1.21.1

Patch release. Pins the action row in the centred dialog so the primary
button stays reachable without scrolling under long forms, browser zoom, or
display scaling. No migrations, no breaking changes.

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.21.0
+  version: 1.21.1
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.