fix(insights): keep the server-only rollup readers out of the insights client bundle

The v1.9.0 time-range work imported ANALYTICS_RANGES as a value into the
time-range pills and the insights layout-prefs hook from range-delta.ts.
That module also pulls the rollup readers and the Postgres client, so the
value import dragged pg (dns/fs/net/tls) into the browser bundle and broke
the production build with eight "Module not found" errors.

Move the client-safe pieces — the range list, its type, the per-range
window length, and the period-over-period result shapes — into a new
range-shared module that imports nothing server-side. The insights client
components import from there; range-delta.ts re-exports the same names so
the server route and the OpenAPI registry keep their import paths. The
window-composition logic and the rollup/db imports stay server-side.

No runtime behaviour change — a pure module-boundary split.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
(cherry picked from commit 75124e76c1e987d8a022fb39d891049340199b38)

src/hooks/use-analytics-range.ts

@@ -4,7 +4,7 @@ import { useQuery } from "@tanstack/react-query";
 
 import { useAuth } from "@/hooks/use-auth";
 import { queryKeys } from "@/lib/query-keys";
-import type { AnalyticsRange } from "@/lib/analytics/range-delta";
+import type { AnalyticsRange } from "@/lib/analytics/range-shared";
 
 /**
  * v1.9.0 — client reader for the single-metric period-over-period range

src/hooks/use-insights-layout-prefs.ts

@@ -12,7 +12,7 @@ import {
 import {
   ANALYTICS_RANGES,
   type AnalyticsRange,
-} from "@/lib/analytics/range-delta";
+} from "@/lib/analytics/range-shared";
 
 const RANGE_STORAGE_KEY = "healthlog.insights.range";
 const DEFAULT_RANGE: AnalyticsRange = "30d";