feat: add View Parent Company link to vendor detail page

- Add "View Parent Company" button in More Actions section
- Show parent company name in info text
- Add deleteVendor function to vendor-edit.js

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

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

app/templates/admin/vendor-detail.html

@@ -270,6 +270,16 @@
             More Actions
         </h3>
         <div class="flex flex-wrap gap-3">
+            <!-- View Parent Company -->
+            <a
+                :href="'/admin/companies/' + vendor?.company_id + '/edit'"
+                class="inline-flex items-center px-4 py-2 text-sm font-medium text-white transition-colors duration-150 bg-blue-600 border border-transparent rounded-lg hover:bg-blue-700 focus:outline-none focus:shadow-outline-blue"
+            >
+                <span x-html="$icon('office-building', 'w-4 h-4 mr-2')"></span>
+                View Parent Company
+            </a>
+
+            <!-- Customize Theme -->
             <a
                 :href="`/admin/vendors/${vendorCode}/theme`"
                 class="inline-flex items-center px-4 py-2 text-sm font-medium text-white transition-colors duration-150 bg-purple-600 border border-transparent rounded-lg hover:bg-purple-700 focus:outline-none focus:shadow-outline-purple"
@@ -278,6 +288,11 @@
                 Customize Theme
             </a>
         </div>
+        <p class="mt-3 text-xs text-gray-500 dark:text-gray-400">
+            <span x-html="$icon('information-circle', 'w-4 h-4 inline mr-1')"></span>
+            This vendor belongs to company: <strong x-text="vendor?.company_name"></strong>.
+            Contact info and ownership are managed at the company level.
+        </p>
     </div>
 </div>
 {% endblock %}