- Keep loop counters in FindNextItem/FindPrevItem (prevents infinite recursion)
- Restore FindNextDownItem/FindNextUpItem to original logic:
- Move ONE row, then delegate to FindNextItem if slot empty
- Fix boundary check in FindNextUpItem: use BEQ/BPL for signed comparison
(CMP #$01 : BCS was wrong - unsigned comparison treats $FE as 254 >= 1)
The original design: Up/Down navigate rows, delegate to horizontal scan
if target slot is empty. The loop counters in horizontal navigation
prevent infinite loops when all items are empty.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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