chore(release): v1.4.39.1

Hotfix on top of v1.4.39. Three measurement write paths (Withings
sync, `/api/import`, admin backup restore) were bypassing the
persistent rollup tier's write hook, so the dashboard chart's
`source=rollup` fast-path painted the "Noch nicht genug Daten"
empty-state at the 30 / 90 range on accounts whose recent data only
came through those paths. The 7-day window kept rendering because the
chart's raw fetch never consults the rollup tier.

This release wires the write hook into every remaining ingest path,
re-anchors the boot-time backfill discovery to per-day coverage so
already-deployed instances re-converge on the next worker boot, and
re-anchors one date-bound test in the medications-intake route suite
so the green CI run no longer depends on the wall clock.

Tests 4647 → 4648 passing; one long-standing skip unchanged.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.4.39",
+  "version": "1.4.39.1",
   "description": "Self-hosted personal-health-tracking PWA with Withings integration, AI insights, and doctor-report PDF export.",
   "license": "AGPL-3.0-only",
   "homepage": "https://healthlog.dev",