chore(release): v1.8.3 — Insights no longer block the interface

Per-category Insights assessments are served read-only from cache and
generated out of band, the client request is capped, the overnight warm
pass keys on the shown language, a stalled model is briefly remembered,
and Insights/dashboard stream a loading skeleton — so opening and
switching Insights categories stays responsive instead of freezing.

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.8.2
+  version: 1.8.3
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.