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/companies.js

@@ -190,7 +190,7 @@ function adminCompanies() {
         async deleteCompany(company) {
             if (company.vendor_count > 0) {
                 companiesLog.warn('Cannot delete company with vendors');
-                alert(`Cannot delete "${company.name}" because it has ${company.vendor_count} vendor(s). Please delete or reassign the vendors first.`);
+                Utils.showToast(`Cannot delete "${company.name}" because it has ${company.vendor_count} vendor(s). Please delete or reassign the vendors first.`, 'warning');
                 return;
             }
 
@@ -214,10 +214,10 @@ function adminCompanies() {
                 await this.loadCompanies();
                 await this.loadStats();
 
-                alert(`Company "${company.name}" deleted successfully`);
+                Utils.showToast(`Company "${company.name}" deleted successfully`, 'success');
             } catch (error) {
                 companiesLog.error('Failed to delete company:', error);
-                alert(`Failed to delete company: ${error.message}`);
+                Utils.showToast(`Failed to delete company: ${error.message}`, 'error');
             }
         },