fix(i18n): formatDateOrRelative dispatches to One/Other plural keys (v1.4.49.2)

Marc reported raw `insights.relativeHoursAgo` rendering verbatim across
medication cards, recent-achievements, admin sections, and the iOS
notification preview — anywhere `formatDateOrRelative` paints a
timestamp older than 60 s. The helper called `t("insights.relative
MinutesAgo", { count })` / `t("insights.relativeHoursAgo", { count })`
against a translation bundle that ships only the pluralised `*One` /
`*Other` variants; the i18n surface performs no auto-pluralisation so
the bare key bounced through `t()`'s identity fallback into the UI.

The fix mirrors the One/Other dispatch pattern that the v1.4.43 H6
sweep added to the canonical `src/lib/i18n/relative-time.ts:24-48`
helper. The format-twin in `src/lib/format.ts` was missed in that
sweep because the two helpers had drifted into byte-different siblings
since v1.4.20.

Audit confirmed the leak was isolated to these two keys: I cross-
checked every `t(…, { count })` call in the repo against
`messages/en.json`. The other 17 call sites (`insights.dayStreak`,
`medications.importDuplicatesSkipped`, `achievements.metricPercent`,
`passwordStrength.minLength`, `settings.integrationPill.*`,
`targets.*`, `admin.section.backups.uploadSuccess`,
`trendHints.remainingMany`, `dashboard.staleHint`, …) all use plain
non-pluralised keys that exist verbatim in the bundle.

Regression guard added to `format-date-or-relative.test.ts`: drives
every relative bucket through the helper, collects the `t()` keys it
emits, and asserts each one has a matching entry in `messages/en.json`.
Pre-fix this guard fails on the two bare keys; future twin-helper
divergence (e.g. someone adds a third date-formatting helper with a
copy-pasted body that lacks the pluralisation step) trips it before
it reaches prod.

Bundles v1.4.49.1's analytics rollup-tier delegation that the Coolify
auto-deploy never picked up.

Tests: 5269 unit + integration pass, lint clean, typecheck clean.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.4.49.1",
+  "version": "1.4.49.2",
   "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",