fix: Sortierung bevorzugt Matches mit näherem Betrag

Matches die innerhalb von 10% des Transaktionsbetrags liegen
werden jetzt vor Matches mit größerer Abweichung angezeigt.

Bei 523€ Transaktion:
- Multi-Match 529€ (Diff 6€) → wird bevorzugt
- Einzelmatch 60€ (Diff 463€) → kommt danach

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

class/banktransaction.class.php

@@ -852,8 +852,22 @@ class BankImportTransaction extends CommonObject
 			}
 		}
 
-		// Sort by score descending
-		usort($matches, function($a, $b) {
+		// Sort by: 1) Amount difference (closer to transaction amount is better), 2) Score
+		$absAmount = abs($this->amount);
+		usort($matches, function($a, $b) use ($absAmount) {
+			$diffA = abs($a['amount'] - $absAmount);
+			$diffB = abs($b['amount'] - $absAmount);
+
+			// If one match is much closer in amount (within 10% of transaction), prefer it
+			$threshold = $absAmount * 0.10;
+			if ($diffA < $threshold && $diffB >= $threshold) {
+				return -1; // A is better (closer amount)
+			}
+			if ($diffB < $threshold && $diffA >= $threshold) {
+				return 1; // B is better (closer amount)
+			}
+
+			// Otherwise sort by score
 			return $b['match_score'] - $a['match_score'];
 		});