fix(members): improve retroactive wizard error feedback and loading state

- Show loading spinner on submit button while saving
- Display error in a prominent red banner at top of wizard on failure
- Error message is now shown directly (not buried in generic alerts)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Modules/Members/Controllers/RetroactiveWizardController.php

@@ -50,13 +50,8 @@ class RetroactiveWizardController extends Controller
 
         if (!$result['success']) {
             $errorMsg = $result['error'] ?? 'خطأ غير معروف';
-            $errorLines = array_filter(explode("\n", $errorMsg));
             $session = App::getInstance()->session();
-            $alerts = [];
-            foreach ($errorLines as $line) {
-                $alerts[] = ['type' => 'error', 'message' => trim($line)];
-            }
-            $session->flash('_alerts', $alerts);
+            $session->flash('_wizard_error', $errorMsg);
             $session->flash('_old_input', $_POST);
             return $this->redirect('/members/retroactive-wizard');
         }

app/Modules/Members/Views/retroactive-wizard.php

@@ -3,6 +3,19 @@
 
 <?php $__template->section('content'); ?>
 
+<?php
+$session = \App\Core\App::getInstance()->session();
+$wizardAlerts = $session->getFlash('_wizard_error');
+if ($wizardAlerts): ?>
+<div style="background:#FEF2F2;border:2px solid #DC2626;border-radius:12px;padding:16px 20px;margin-bottom:16px;direction:rtl;">
+    <div style="display:flex;align-items:center;gap:8px;margin-bottom:8px;">
+        <svg width="24" height="24" fill="none" stroke="#DC2626" stroke-width="2" viewBox="0 0 24 24"><circle cx="12" cy="12" r="10"/><path d="M12 8v4m0 4h.01"/></svg>
+        <strong style="color:#DC2626;font-size:15px;">حدث خطأ أثناء حفظ العضوية</strong>
+    </div>
+    <p style="color:#991B1B;margin:0;font-size:14px;"><?= e($wizardAlerts) ?></p>
+</div>
+<?php endif; ?>
+
 <div id="retroWizard">
     <!-- Progress Bar -->
     <div class="card" style="margin-bottom:16px;padding:16px;">
@@ -1170,6 +1183,12 @@ document.getElementById('retroForm').addEventListener('submit', function(e) {
             return;
         }
     }
+    // Show loading state
+    var btn = document.getElementById('btnSubmit');
+    btn.disabled = true;
+    btn.innerHTML = '<span class="spinner-border spinner-border-sm" role="status"></span> جاري الحفظ...';
+    btn.style.opacity = '0.7';
+    btn.style.cursor = 'not-allowed';
 });
 
 // Clear highlights on input