fix(react-db): handle rejected/stale setWindow promises in useLiveInfiniteQuery (#1269)

* fix(react-db): handle rejected/stale setWindow promises in useLiveInfiniteQuery

Three issues in the useEffect that calls setWindow():

1. No .catch() — if setWindow rejects, isFetchingNextPage stays true
   forever with no error surfaced.

2. No cleanup — if the effect re-runs while a previous promise is
   pending, the stale .then() can set isFetchingNextPage=false
   prematurely while new loading is in progress.

3. Unhandled promise rejection — the promise has no rejection handler,
   causing an unhandled rejection warning.

Add .catch() with error logging, a cancelled flag with useEffect
cleanup to ignore stale promise settlements.

Fixes #1240

* add changeset

* ci: apply automated fixes

* refactor: use finally block for setIsFetchingNextPage

* ci: apply automated fixes

---------

Co-authored-by: Dmitrii Troitskii <jsleitor@gmail.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: sleitor

.changeset/fix-setwindow-promises.md

@@ -0,0 +1,5 @@
+---
+'@tanstack/react-db': patch
+---
+
+fix(react-db): handle rejected/stale setWindow promises in useLiveInfiniteQuery

packages/react-db/src/useLiveInfiniteQuery.ts

@@ -246,19 +246,29 @@ export function useLiveInfiniteQuery<TContext extends Context>(
     if (!isCollection && !queryResult.isReady) return
 
     // Adjust the window
+    let cancelled = false
     const result = utils.setWindow({
       offset: expectedOffset,
       limit: expectedLimit,
     })
 
     if (result !== true) {
       setIsFetchingNextPage(true)
-      result.then(() => {
-        setIsFetchingNextPage(false)
-      })
+      result
+        .catch((error: unknown) => {
+          if (!cancelled)
+            console.error(`useLiveInfiniteQuery: setWindow failed:`, error)
+        })
+        .finally(() => {
+          if (!cancelled) setIsFetchingNextPage(false)
+        })
     } else {
       setIsFetchingNextPage(false)
     }
+
+    return () => {
+      cancelled = true
+    }
   }, [
     isCollection,
     queryResult.collection,