Fix pagination termination logic and extract max pages constant

[Copilot]

Addresses two issues in the GitHub search pagination implementation:

Issue 1: Incorrect pagination termination

The condition page * perPage >= totalCount fails when totalCount is exactly divisible by perPage. For 200 items with perPage=100, after fetching page 2, the condition 2 * 100 >= 200 stops pagination correctly, but the logic was comparing against the wrong accumulator (allItems.length, which includes deduplicated items across all queries) instead of items fetched for the current query.

Changes:

• Track items per query: Added itemsFetchedForQuery counter that accumulates items from the API response before deduplication
• Fix termination condition: Changed from page * perPage >= totalCount || items.length < perPage to items.length < perPage || itemsFetchedForQuery >= totalCount
• Extract constant: Moved maxPages = 10 to module-level GITHUB_SEARCH_API_MAX_PAGES in settings.ts for consistency with other API constants

// Before: compared against global deduplicated count
if (page * perPage >= totalCount || items.length < perPage) {
  break;
}

// After: track items fetched for current query
let itemsFetchedForQuery = 0;
// ... in fetch loop:
itemsFetchedForQuery += items.length;
if (items.length < perPage || itemsFetchedForQuery >= totalCount) {
  break;
}

The fix ensures accurate pagination for edge cases where the total count is exactly divisible by the page size.

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