refactor: standardize admin templates with shared macros

Migrate all admin templates to use standardized components:
- Use tabs macros (tabs_nav, tab_button) for tab navigation
- Use number_stepper for quantity/numeric inputs
- Use headers macros for consistent page layouts
- Use modals macros for dialog components

Affected pages: dashboard, settings, logs, content-pages, companies,
vendors, users, imports, marketplace, code-quality, and more.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/vendor/marketplace.html

@@ -1,5 +1,6 @@
 {# app/templates/vendor/marketplace.html #}
 {% extends "vendor/base.html" %}
+{% from 'shared/macros/inputs.html' import number_stepper %}
 
 {% block title %}Marketplace Import{% endblock %}
 
@@ -110,14 +111,7 @@
                     <label class="block text-sm font-medium text-gray-700 dark:text-gray-400 mb-2">
                         Batch Size
                     </label>
-                    <input
-                        x-model.number="importForm.batch_size"
-                        type="number"
-                        min="100"
-                        max="5000"
-                        step="100"
-                        class="block w-full px-3 py-2 text-sm text-gray-700 dark:text-gray-300 bg-white dark:bg-gray-700 border border-gray-300 dark:border-gray-600 rounded-md focus:border-purple-400 focus:outline-none focus:shadow-outline-purple"
-                    />
+                    {{ number_stepper(model='importForm.batch_size', min=100, max=5000, step=100, label='Batch Size') }}
                     <p class="mt-1 text-xs text-gray-500 dark:text-gray-400">
                         Number of products to process per batch (100-5000)
                     </p>