Team-Statistik: Neu-Badge-Link kannte $selectedTree nicht (ViewException auf Produktion)

Die Closure fuer den Link des gruenen "+N"-Badges band die neue Variable nicht per use ein;
sobald eine Linie neue Abos zaehlte, brach die Uebersicht mit "Undefined variable $selectedTree" ab.
Regressionstest rendert die Uebersicht mit einem neuen Teamabo und prueft den Badge-Link.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tests/Feature/BackofficeStatisticsDrilldownTest.php

@@ -8,6 +8,7 @@ use App\Models\UserSalesVolume;
 use App\Services\Abo\TeamAboOverviewService;
 use App\Services\Backoffice\BackofficeDashboardService;
 use App\Services\Backoffice\BackofficeDrilldownService;
+use App\Services\HTMLHelper;
 use App\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\URL;
@@ -337,3 +338,36 @@ it('haengt die Sortierwerte an die Zellen der Drilldown-Tabelle (A14)', function
         ->toContain('data-sort-value="2026-12-10"')
         ->toContain('data-sort-value="20"');
 });
+
+it('rendert die Uebersicht mit dem Neu-Badge samt Baum-Parameter (Regression: Closure ohne $selectedTree)', function (): void {
+    URL::resolveMissingNamedRoutesUsing(fn (string $name, $parameters = []) => '/'.$name.'?'.http_build_query($parameters));
+
+    $root = boMakeUser();
+    $anna = boMakeUser($root->id, '2026-03-15');
+    boMakeAbo($anna->id, 'me', '2026-06-10', 20);
+    $this->actingAs($root);
+
+    $statistics = app(BackofficeDashboardService::class)->overview($root, 6, 2026);
+
+    expect($statistics['totals']['team_partner_abos_new'])->toBe(1);
+
+    // Das gruene "+1"-Badge wird nur gerendert, wenn es neue Abos gibt — erst dann
+    // laeuft die Link-Closure, die auf Produktion mit "Undefined variable
+    // $selectedTree" abbrach (14.09.2026).
+    $html = view('user.backoffice.statistics.index', [
+        'selectedMonth' => 6,
+        'selectedYear' => 2026,
+        'selectedTree' => BackofficeDashboardService::TREE_COMMISSION,
+        'treeLabels' => BackofficeDashboardService::treeLabels(),
+        'filterMonths' => HTMLHelper::getTransMonths(),
+        'filterYears' => HTMLHelper::getYearRange(2022),
+        'statistics' => $statistics,
+        'performance' => ['duration_ms' => 1.0, 'source' => 'live', 'source_label' => 'Live', 'calculated_at' => null],
+        'commission' => null,
+    ])->render();
+
+    expect($html)
+        ->toContain('backoffice-statistics-click-badge')
+        ->toContain('only_new=1')
+        ->toContain('tree=commission');
+});