feat(project-editor): reusable image-field (thumbnail+replace+remove), branding OG image+gallery

- shared app-image-field component: thumbnail preview, replace, remove, opens media-picker
- branding: add socialImageUrl + galleryUrls fields, wire to new image-field
- footer: logo + payment icon fields use image-field (drop manual media-picker plumbing)
- i18n: common.remove, adminCategories.replaceImage, builder.socialImage/gallery keys (en/ru/hy)

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

src/app/i18n/translations.ts

@@ -425,6 +425,9 @@ export interface Translations {
     logo: string;
     smallLogo: string;
     favicon: string;
+    socialImage: string;
+    gallery: string;
+    addGalleryImage: string;
     marketplaceTitle: string;
     primaryColor: string;
     secondaryColor: string;
@@ -570,6 +573,8 @@ export interface Translations {
     logoDesc: string;
     smallLogoDesc: string;
     faviconDesc: string;
+    socialImageDesc: string;
+    galleryDesc: string;
     marketplaceTitleDesc: string;
     primaryColorDesc: string;
     secondaryColorDesc: string;
@@ -763,6 +768,7 @@ export interface Translations {
   common: {
     retry: string;
     loading: string;
+    remove: string;
   };
   location: {
     allRegions: string;
@@ -930,6 +936,7 @@ export interface Translations {
   // anywhere, so it rendered as the literal string "adminCategories.chooseImage".
   adminCategories: {
     chooseImage: string;
+    replaceImage: string;
   };
   adminProducts: {
     emptyTitle: string;