chore(release): v1.13.3 — health score rates blood pressure again, steps in Insights

- Health score reads the all-time blood-pressure-in-range rate (not the trailing
  30 days), so an account with BP history but no recent readings keeps its BP
  pillar instead of showing "no rating"; the 30-day rate still drives the tile
  headline. (Regression from the v1.8.7 BP-headline window change.)
- ACTIVITY_STEPS now has its own Insights sub-page + nav entry (it was tracked +
  on the dashboard but absent from the Insights metric registry).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.13.2
+  version: 1.13.3
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.