Description

After running more than one scan in a session, exporting the IPs of an older batch yields an empty / 0-byte file, even though the History entry still shows the correct success count. The export of the batch that is currently "live" works; subsequent exports of aged-out batches are empty.

Steps to reproduce

1. Run a scan, then export Valid IPs (TXT) → file has content. ✅
2. Run a second scan.
3. Go to History → Export Valid on the first scan (or use Valid IPs (All)).
4. Downloaded file is 0 bytes, despite the History entry showing N successes. ❌

Root cause

In src/App.tsx:

const mergedResults = liveResults.length ? liveResults : allResults;

liveResults holds only the current batch (reset at each scan start). allResults accumulates every batch (persisted to localStorage). Because the ternary returns liveResults whenever it's non-empty, a finished scan shadows allResults, so any export filtering mergedResults by an older batchId finds nothing → empty file.

Expected

Exporting any batch from History (and "All") returns its results regardless of how many scans ran afterwards.

Fix

Make mergedResults a deduped union of the live batch and all persisted batches. (PR opened.)