The header checklist claimed boundary handling for group drag outside the board, but no test exercised that path or verified moves don't increment on an invalid group move.

Changes

• Header checklist: Added entry – drag&drop grupy klocków poza granicę planszy: licznik moves NIE rośnie to match actual coverage
• Test 16 (grupowy drag poza granicę planszy nie zwiększa moves): Selects pieces at positions 0 and 1, drags piece 1 onto piece 0 (offset = −1). isGroupMoveValid rejects the move since piece 0 would land at position −1, and the test asserts the counter stays at 0.

// Pieces 0 and 1 selected; dragging piece 1 → piece 0 produces offset = -1.
// isGroupMoveValid rejects: piece 0 would move to position -1 (out of bounds).
await dragPiece(page, 1, 0);
await expect(page.locator('text=/0 Move/')).toBeVisible();

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