fix: resolve ESLint error - move ref assignment out of render

- Move scheduleRef.current assignment into useEffect to avoid "Cannot access refs during render" error
- Remove unused Timestamp import and stale eslint-disable comment in dream-gym admin service

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: opeyemiariyo-netizen

src/app/dashboard/dream-gym/schedule/page.tsx

@@ -62,7 +62,9 @@ export default function SchedulePage() {
   const scheduleRef = useRef<WeekSchedule>({});
 
   // Keep ref in sync with state for use in debounced save
-  scheduleRef.current = schedule;
+  useEffect(() => {
+    scheduleRef.current = schedule;
+  });
 
   // Load players on mount
   useEffect(() => {

src/lib/firebase/admin-services/dream-gym.ts

@@ -8,7 +8,7 @@
  */
 
 import { adminDb } from '../admin';
-import { Timestamp } from 'firebase-admin/firestore';
+
 import type {
   DreamGym,
   DreamGymDocument,
@@ -62,7 +62,6 @@ function toDreamGym(id: string, data: DreamGymDocument): DreamGym {
 export async function getDreamGymAdmin(
   userId: string,
   playerId: string
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
 ): Promise<(DreamGym & { weeklyGrid?: Record<string, Record<string, string | null>> }) | null> {
   const docRef = adminDb.doc(`users/${userId}/players/${playerId}/dreamGym/${DREAM_GYM_DOC_ID}`);
   const docSnap = await docRef.get();