fix(link-checker): switch entry pagination to cursor-based to bypass 10k CMA limit [ES-524]

The Contentful CMA enforces a hard cap of skip+limit<=10000. With
ENTRY_FETCH_LIMIT=100 this meant the fetching loop silently stopped after
100 pages (10000 entries), which for the customer space translated to
~14,670 links found. Replace skip-based pagination with sys.id[gt] cursor
pagination (ordered by sys.id) which has no upper bound.

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

Author: harikakondur

apps/link-checker/components/locations/Page.tsx

@@ -318,22 +318,23 @@ export default function Page() {
       const resultMap = new Map<string, PageLinkResult>();
       const checksToQueue: typeof pendingChecks = [];
 
-      let skip = 0;
+      let lastSeenId: string | undefined;
       let hasLoadedFirstBatch = false;
       let entriesScanned = 0;
       let linksFound = 0;
       const entryQueryBase = {
         'sys.contentType.sys.id[in]': Array.from(contentTypeMap.keys()).join(','),
+        order: 'sys.id',
       };
 
       while (true) {
         const response = await sdk.cma.entry.getMany({
           spaceId: sdk.ids.space,
           environmentId: sdk.ids.environment,
           query: {
-            skip,
             limit: ENTRY_FETCH_LIMIT,
             ...entryQueryBase,
+            ...(lastSeenId ? { 'sys.id[gt]': lastSeenId } : {}),
           },
         });
 
@@ -461,7 +462,7 @@ export default function Page() {
           break;
         }
 
-        skip += ENTRY_FETCH_LIMIT;
+        lastSeenId = batchEntries[batchEntries.length - 1].sys.id;
       }
 
       if (!hasLoadedFirstBatch) {