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/shared/ui/image-field/image-field.component.scss

@@ -0,0 +1,34 @@
+:host {
+  display: block;
+}
+
+.image-field {
+  display: flex;
+  gap: 12px;
+  align-items: flex-start;
+}
+
+.image-field__thumb {
+  width: 56px;
+  height: 56px;
+  border-radius: 10px;
+  border: 1px solid var(--border-color, #d3dad9);
+  object-fit: cover;
+  background: #fbfcfc;
+  flex-shrink: 0;
+}
+
+.image-field__thumb--empty {
+  background: repeating-conic-gradient(#f0f2f1 0% 25%, #fbfcfc 0% 50%) 0 0 / 12px 12px;
+}
+
+.image-field__controls {
+  flex: 1;
+  display: grid;
+  gap: 8px;
+}
+
+.image-field__actions {
+  display: flex;
+  gap: 8px;
+}