Fix pagination limit warning condition in fetchAllSearchItems

[Copilot]

The pagination warning condition if (page > maxPages) never evaluates to true because the while loop exits when page <= maxPages, making post-loop page at most maxPages + 1. This meant the warning never fired when hitting GitHub's 1000-item search limit.

Changes:

• Moved totalCount from loop-scoped to function-scoped variable to track total available items
• Changed condition from if (page > maxPages) to if (allItems.length < totalCount) to detect incomplete pagination
• Updated warning message to show ${allItems.length} items out of ${totalCount} total for better visibility

// Before: totalCount scoped inside loop, unreachable condition
while (page <= maxPages) {
  const totalCount = searchData.total_count;
  // ...
}
if (page > maxPages) { /* never true */ }

// After: totalCount accessible, correct condition
let totalCount = 0;
while (page <= maxPages) {
  totalCount = searchData.total_count;
  // ...
}
if (allItems.length < totalCount) { /* fires when items remain */ }

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