fix(icons): migrate Marketplace Builder to Lucide

Replace every PrimeIcons pi-* usage across the builder: overview page
(back link, next-step arrow, section cards, readiness checklist,
quick links), sidebar nav (group/section status dots), main layout
(back/home/menu/help icons), brand + homepage overview panels
(checklist ok/pending dots, contrast warning), footer/homepage/widgets
section editors (drag handles, move up/down, duplicate, remove), and
the HTML editor toolbar (list/link/image/table/divider/code/embed).

Notable correctness fix: PrimeIcons reused pi-bars for both the
hamburger menu toggle AND every drag handle - two different meanings
sharing one icon (exactly the kind of icon collision the audit calls
out). Added a dedicated 'grip' icon (GripVertical) for drag handles so
menu and drag-to-reorder are visually distinct.

Added a global .spin utility (icon-registry has no built-in spinner
animation) for the one loading-spinner icon in the builder overview
checklist.

All icon-bearing fields (BuilderGroup.icon, BlockCatalogEntry.icon,
WIDGET_ICONS, STATUS_ICON, HtmlEditorToolbarCommand.icon, etc.) are
now typed AppIconName instead of string.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/features/project-editor/sections/footer-section.component.ts

@@ -10,6 +10,7 @@ import { FormFieldComponent } from '../../../shared/ui/form-field/form-field.com
 import { SectionCardComponent } from '../../../shared/ui/section-card/section-card.component';
 import { KeyValueEditorComponent } from '../../../shared/ui/key-value-editor/key-value-editor.component';
 import { ImageFieldComponent } from '../../../shared/ui/image-field/image-field.component';
+import { IconComponent } from '../../../shared/ui/icon/icon.component';
 import { FooterColumnConfig, FooterLinkConfig, FooterPaymentIconConfig, FooterSocialLinkConfig } from '../../../shared/models/config';
 import { isValidHttpUrl } from '../schema/validators/primitives';
 import { ContentPageService } from '../../content-management/services/content-page.service';
@@ -26,7 +27,8 @@ import { ContentPageService } from '../../content-management/services/content-pa
     FormFieldComponent,
     SectionCardComponent,
     KeyValueEditorComponent,
-    ImageFieldComponent
+    ImageFieldComponent,
+    IconComponent
   ],
   templateUrl: './footer-section.component.html',
   styleUrls: ['./section.shared.scss', './footer-section.component.scss'],