fix(fitbit): wire the activity page-size constant and drop dead exports

Use FITBIT_ACTIVITY_PAGE_SIZE for the sleep and exercise reads instead of a
magic 25, remove the unused FitbitDataTypeKey type, and declare the crosstab
day floors independently so they aren't a duplicate re-export of the influence
floors.

src/lib/fitbit/client.ts

@@ -351,8 +351,6 @@ export const FITBIT_DATA_TYPES = {
   exercise: { path: "exercise", filter: "exercise", timeField: "interval" },
 } as const satisfies Record<string, FitbitDataType>;
 
-export type FitbitDataTypeKey = keyof typeof FITBIT_DATA_TYPES;
-
 /** Google Health `DataPoint` — value object is type-keyed + carries a time anchor. */
 export interface FitbitDataPoint {
   [key: string]: unknown;

src/lib/fitbit/sync-sleep.ts

@@ -16,7 +16,12 @@
  * A per-data-class 403 soft-skips the resource — the sleep bundle is granted
  * independently of activity / metrics in the Google consent flow.
  */
-import { FITBIT_DATA_TYPES, fetchDataPoints, mapSleepSession } from "./client";
+import {
+  FITBIT_ACTIVITY_PAGE_SIZE,
+  FITBIT_DATA_TYPES,
+  fetchDataPoints,
+  mapSleepSession,
+} from "./client";
 import {
   getValidToken,
   handleCollectionFetchError,
@@ -43,7 +48,7 @@ export async function syncUserSleep(
       FITBIT_DATA_TYPES.sleep,
       tokenInfo.accessToken,
       "fetchSleep",
-      { start, pageSize: 25 },
+      { start, pageSize: FITBIT_ACTIVITY_PAGE_SIZE },
     );
   } catch (err) {
     return handleCollectionFetchError("fetchSleep", userId, err);

src/lib/fitbit/sync-workout.ts

@@ -15,6 +15,7 @@
  * granted independently in the Google consent flow.
  */
 import {
+  FITBIT_ACTIVITY_PAGE_SIZE,
   FITBIT_DATA_TYPES,
   fetchDataPoints,
   mapWorkout,
@@ -45,7 +46,7 @@ export async function syncUserWorkout(
       FITBIT_DATA_TYPES.exercise,
       tokenInfo.accessToken,
       "fetchExercise",
-      { start, pageSize: 25 },
+      { start, pageSize: FITBIT_ACTIVITY_PAGE_SIZE },
     );
   } catch (err) {
     return handleCollectionFetchError("fetchExercise", userId, err);

src/lib/insights/mood-aggregates.ts

@@ -724,12 +724,13 @@ export function computeBetterDays(
 export const CROSSTAB_FDR_Q = 0.1;
 
 /**
- * Per-side day floors for the crosstab — reuse the influence floors so a
- * tag needs the same defensible present/absent support before a metric
- * delta surfaces.
+ * Per-side day floors for the crosstab — kept in step with the influence
+ * floors (`INFLUENCE_MIN_PRESENT_DAYS` / `INFLUENCE_MIN_ABSENT_DAYS`) so a tag
+ * needs the same defensible present/absent support before a metric delta
+ * surfaces. Declared independently so the crosstab surface owns its own floor.
  */
-export const CROSSTAB_MIN_PRESENT_DAYS = INFLUENCE_MIN_PRESENT_DAYS;
-export const CROSSTAB_MIN_ABSENT_DAYS = INFLUENCE_MIN_ABSENT_DAYS;
+export const CROSSTAB_MIN_PRESENT_DAYS = 5;
+export const CROSSTAB_MIN_ABSENT_DAYS = 5;
 
 /** Max rows surfaced across the whole crosstab so the surface stays scannable. */
 export const CROSSTAB_MAX_ROWS = 8;