fix: add missing icons and use Utils.showToast() for notifications

Icons:
- Add cloud-download, cloud-upload, and key icons

Notifications:
- Replace alert() with Utils.showToast() in companies.js
- Replace alert() with Utils.showToast() in content-pages.js
- Add noqa comment for intentional fallback in components.js

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

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

static/admin/js/components.js

@@ -557,7 +557,8 @@ function adminComponents() {
                 Utils.showToast(messages[type] || messages.info, type);
             } else {
                 componentsLog.error('Utils.showToast not available');
-                alert(messages[type] || messages.info); // Fallback to alert
+                // noqa: JS-009 - Fallback for component showcase when Utils not loaded
+                alert(messages[type] || messages.info);
             }
         },