feat(120): alert component unification

Phase 120 - Plan 01:
- Reusable PHP alert component (resources/views/components/alert.php)
  with inline SVG icon per type, optional dismiss button.
- Missing .alert--info SCSS variant added (#eff6ff/#bfdbfe/#1e3a8a) -
  fixes black-on-white alert after Fakturownia test connection.
- Flash::push(type, message) + Flash::all() with BC for set/get;
  legacy key heuristic (error/.save/warning -> typed entries).
- Central flash renderer in 3 layouts (app/auth/public) iterating
  Flash::all() through component (.alerts-stack wrap).
- Vanilla JS alert-dismiss.js with idempotent guard and delegated
  click handler on [data-alert-dismiss].
- 36 views migrated off inline <div class="alert alert--TYPE">;
  .flash--error/success removed from views (orders/show, shipments/prepare).
- SCSS rebuilt: public/assets/css/{app,login}.css.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

resources/views/statistics/orders.php

@@ -109,13 +109,18 @@ foreach ($channelOptions as $channelOption) {
 
 <section class="card mt-16 statistics-orders-table-wrap">
   <?php if ($debugEnabled): ?>
-    <div class="alert alert--warning" role="alert">
+    <?php
+      ob_start();
+    ?>
       <strong>DEBUG</strong>
       <pre style="margin:8px 0 0;white-space:pre-wrap;"><?= $e(json_encode([
         'filters' => $debugMeta,
         'diagnostics' => $diagnostics,
       ], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT)) ?></pre>
-    </div>
+    <?php
+      $statisticsDebugHtml = ob_get_clean();
+    ?>
+    <?php $type='warning'; $messageHtml=$statisticsDebugHtml; $dismissible=true; include dirname(__DIR__) . '/components/alert.php'; unset($messageHtml); ?>
   <?php endif; ?>
 
   <?php if (!$hasData): ?>