Feature: Bankbuchungs-Badge in Beleganzeige unterhalb der Buchungszeilen

src/Controllers/BelegController.php

@@ -243,6 +243,8 @@ class BelegController
             }
         }
 
+        $linkedBankTx = BankTransaction::findByBelegId((int)$beleg['id']);
+
         $view = new View();
         $view->render('layout/base.php', [
             'pageTitle' => 'Beleg ' . $beleg['beleg_nr'],
@@ -260,6 +262,7 @@ class BelegController
                 'bankTxSupplier'  => $bankTxSupplier,
                 'bankTxBrutto'    => $bankTxBrutto,
                 'formData'        => $bankFormData,
+                'linkedBankTx'    => $linkedBankTx,
             ]),
         ]);
     }

src/Models/BankTransaction.php

@@ -147,6 +147,19 @@ class BankTransaction
         return ['new' => $new, 'dup' => $dup];
     }
 
+    public static function findByBelegId(int $belegId): ?array
+    {
+        $row = Database::fetchOne(
+            'SELECT bt.*, bib.filename AS batch_filename
+             FROM bank_transactions bt
+             JOIN bank_import_batches bib ON bib.id = bt.batch_id
+             WHERE bt.beleg_id = ?
+             LIMIT 1',
+            [$belegId]
+        );
+        return $row ?: null;
+    }
+
     public static function createBatch(int $formatId, string $filename, int $rowCount): int
     {
         Database::execute(

src/Views/belege/detail.php

@@ -295,6 +295,28 @@ $suppliers = $suppliers ?? [];
             </div>
         </div>
 
+        <!-- Gespeicherte Bankbuchungs-Verknüpfung -->
+        <?php if ($linkedBankTx ?? null): ?>
+        <?php $lbt = $linkedBankTx; $lbwert = (float)$lbt['wert']; ?>
+        <a href="/bank/<?= (int)$lbt['id'] ?>" class="card mb-2"
+           style="display:block;text-decoration:none;color:inherit;border-left:4px solid var(--color-success)">
+            <div class="card-body" style="padding:.6rem 1.25rem">
+                <div style="display:flex;align-items:center;gap:.75rem;flex-wrap:wrap">
+                    <span class="badge badge-green" style="font-size:.8rem">Bankbuchung</span>
+                    <span class="td-mono text-sm"><?= View::formatDate($lbt['wertstellung']) ?></span>
+                    <?php if ($lbt['vorgang']): ?>
+                    <span class="text-sm text-muted"><?= $h($lbt['vorgang']) ?></span>
+                    <?php endif; ?>
+                    <span class="text-sm" style="flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap"
+                          title="<?= $h($lbt['buchungstext']) ?>"><?= $h($lbt['buchungstext']) ?></span>
+                    <strong style="white-space:nowrap;color:<?= $lbwert >= 0 ? 'var(--color-success)' : 'var(--color-danger)' ?>">
+                        <?= $lbwert >= 0 ? '+' : '' ?><?= number_format($lbwert, 2, ',', '.') ?> €
+                    </strong>
+                </div>
+            </div>
+        </a>
+        <?php endif; ?>
+
         <!-- BankBuchung-Badge (ersetzt KI-Badge wenn aus Bank-Kontext) -->
         <?php if (!$beleg['locked'] && ($bankTx ?? null)): ?>
         <div class="card mb-2" style="border-left:4px solid var(--color-primary,#3b82f6)">