chore(cleanup): drop five unused imports flagged by eslint

The insights page kept `CorrelationResult` + `DataSummary` type imports
left over from an earlier refactor, and the slim summaries slice still
referenced `RollupGranularity`, `aggregateWmyBuckets`, and
`RollupBucketRow` after the v1.4.37.2 GROUP BY rewrite folded that work
into the narrow aggregate. Pure deletions — both helpers stay exported
for the test suite that still exercises them.

src/app/insights/page.tsx

@@ -16,8 +16,6 @@ import { HeroStrip } from "@/components/insights/hero-strip";
 import { useInsightsAdvisorQuery } from "@/components/insights/use-insights-advisor";
 import { useCoachLaunch } from "@/lib/insights/coach-launch-context";
 import { useAnalyticsQuery } from "@/lib/queries/use-analytics-query";
-import type { CorrelationResult } from "@/lib/insights/correlations";
-import type { DataSummary } from "@/lib/analytics/trends";
 
 /**
  * v1.4.33 IW2 — defer the three below-the-fold mother-page blocks

src/lib/analytics/summaries-slice.ts

@@ -53,7 +53,7 @@
  * 100`. Slope `direction` is derived from `slope`'s sign with the
  * same 0.01-units-per-day "stable" threshold the JS helper uses.
  */
-import type { MeasurementType, RollupGranularity } from "@/generated/prisma/client";
+import type { MeasurementType } from "@/generated/prisma/client";
 
 import { prisma } from "@/lib/db";
 import type { DataSummary } from "@/lib/analytics/trends";
@@ -64,11 +64,7 @@ import {
   isFullyCovered,
   probeRollupCoverage,
 } from "@/lib/rollups/measurement-coverage";
-import {
-  aggregateWmyBuckets,
-  readBestGranularityRollups,
-  type RollupBucketRow,
-} from "@/lib/rollups/measurement-read-wmy";
+import { readBestGranularityRollups } from "@/lib/rollups/measurement-read-wmy";
 
 const DAY_MS = 24 * 60 * 60 * 1000;