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/content-pages.js

@@ -130,7 +130,7 @@ function contentPagesManager() {
 
             } catch (err) {
                 contentPagesLog.error('Error deleting page:', err);
-                alert(`Failed to delete page: ${err.message}`);
+                Utils.showToast(`Failed to delete page: ${err.message}`, 'error');
             }
         },