Add-ons: Kaufbestaetigung vor Credit-Abbuchung + deutlichere Buttons

Boost-Laufzeiten und Nachweis oeffnen jetzt ein Bestaetigungs-Modal mit
Preis, Guthaben und Restsaldo; erst "Kostenpflichtig buchen" bucht ab.
Boost-Buttons primary mit explizitem Kauf-Label.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/Feature/PressReleaseShowAddonsTest.php

@@ -49,11 +49,73 @@ test('a published green release shows the boost and proof add-ons', function ()
     LivewireVolt::test('customer.press-releases.show', ['id' => $pr->id])
         ->assertSee('Add-ons')
         ->assertSee('Boost — Platzierung')
-        ->assertSee('7 Tage · 12 Credits')
+        ->assertSee('7 Tage für 12 Credits buchen')
         ->assertSee('Veröffentlichungsnachweis')
         ->assertSee('Für 3 Credits kaufen');
 });
 
+test('add-on buttons only debit after the purchase confirmation modal', function () {
+    /** @var TestCase $this */
+    ['customer' => $customer, 'pr' => $pr] = publishedGreenPrForOwner();
+    $this->wallet->credit($customer, 40);
+
+    $this->actingAs($customer);
+
+    $component = LivewireVolt::test('customer.press-releases.show', ['id' => $pr->id])
+        ->call('confirmBoost', 14)
+        ->assertSet('pendingPurchase', [
+            'type' => 'boost',
+            'label' => 'Boost — 14 Tage Platzierung',
+            'credits' => 20,
+            'days' => 14,
+        ])
+        ->assertSee('Kauf bestätigen')
+        ->assertSee('Kostenpflichtig buchen');
+
+    // Der Klick auf die Laufzeit selbst bucht noch nichts ab.
+    expect($customer->fresh()->creditBalance())->toBe(40);
+    expect($pr->fresh()->isBoosted())->toBeFalse();
+
+    $component->call('buyPendingAddOn')
+        ->assertSet('pendingPurchase', null);
+
+    expect($customer->fresh()->creditBalance())->toBe(20);
+    expect($pr->fresh()->isBoosted())->toBeTrue();
+});
+
+test('the proof purchase runs through the confirmation modal as well', function () {
+    /** @var TestCase $this */
+    ['customer' => $customer, 'pr' => $pr] = publishedGreenPrForOwner();
+    $this->wallet->credit($customer, 10);
+
+    $this->actingAs($customer);
+
+    LivewireVolt::test('customer.press-releases.show', ['id' => $pr->id])
+        ->call('confirmProof')
+        ->assertSet('pendingPurchase.type', 'proof')
+        ->assertSet('pendingPurchase.credits', 3)
+        ->call('buyPendingAddOn')
+        ->assertSee('Nachweis herunterladen');
+
+    expect(app(ProofPdfService::class)->hasPurchased($customer->fresh(), $pr))->toBeTrue();
+    expect($customer->fresh()->creditBalance())->toBe(7);
+});
+
+test('an unknown boost duration does not open the confirmation modal', function () {
+    /** @var TestCase $this */
+    ['customer' => $customer, 'pr' => $pr] = publishedGreenPrForOwner();
+    $this->wallet->credit($customer, 40);
+
+    $this->actingAs($customer);
+
+    LivewireVolt::test('customer.press-releases.show', ['id' => $pr->id])
+        ->call('confirmBoost', 999)
+        ->assertSet('pendingPurchase', null)
+        ->call('buyPendingAddOn');
+
+    expect($customer->fresh()->creditBalance())->toBe(40); // nichts abgebucht
+});
+
 test('booking a boost from the detail page debits the wallet and activates it', function () {
     /** @var TestCase $this */
     ['customer' => $customer, 'pr' => $pr] = publishedGreenPrForOwner();