fix: prevent saving tiny scroll positions in restoration hook (#13554)

fixes 1-2px scroll restoration issue

- browser reports 1-2px instead of exact 0 when at top
- old logic kept saving these tiny values 
- now clears storage when <= 3px (essentially at top)
- prevents weird micro-scroll when returning to pages


re: [greptile infinite polling
concern](https://github.com/twentyhq/twenty/pull/13363#discussion_r2247232974)
- not valid in practice:
- restoration only runs if position was previously saved
- no scroll = no save = no restore = no polling
- tested across all page types, zero infinite loops

tested: works perfectly, no side effects

packages/twenty-front/src/modules/ui/utilities/scroll/constants/ScrollRestorationTopThreshold.ts

@@ -0,0 +1 @@
+export const SCROLL_RESTORATION_TOP_THRESHOLD_PX = 3;

packages/twenty-front/src/modules/ui/utilities/scroll/hooks/useScrollRestoration.ts

@@ -1,3 +1,4 @@
+import { SCROLL_RESTORATION_TOP_THRESHOLD_PX } from '@/ui/utilities/scroll/constants/ScrollRestorationTopThreshold';
 import { scrollWrapperScrollTopComponentState } from '@/ui/utilities/scroll/states/scrollWrapperScrollTopComponentState';
 import { useRecoilComponentValueV2 } from '@/ui/utilities/state/component-state/hooks/useRecoilComponentValueV2';
 import { useCallback, useEffect, useState } from 'react';
@@ -43,9 +44,14 @@ export const useScrollRestoration = (componentInstanceId: string) => {
   );
 
   useEffect(() => {
-    if (scrollTop > 0 && !isRestoring) {
-      sessionStorage.setItem(storageKey, scrollTop.toString());
+    if (isRestoring) return;
+
+    if (scrollTop <= SCROLL_RESTORATION_TOP_THRESHOLD_PX) {
+      sessionStorage.removeItem(storageKey);
+      return;
     }
+
+    sessionStorage.setItem(storageKey, scrollTop.toString());
   }, [scrollTop, storageKey, isRestoring]);
 
   useEffect(() => {