feat(builder): implement professional content management experience

Content dashboard with real published/draft/SEO-health/completion metrics and a recommended-next-action; static pages editor rebuilt as visual page cards (icon/status/SEO badge/last edited) with legal pages surfaced first; full-page editor grouped into Content/SEO/Sharing/Advanced tabs, raw HTML moved behind an Advanced disclosure; hero image now supports alt text and caption; content-health-widget is a reusable checklist+completion component.

src/app/i18n/translations.ts

@@ -935,6 +935,55 @@ export interface Translations {
     previewMobile: string;
     previewToggle: string;
   };
+  contentManagement: {
+    publishedPages: string;
+    draftPages: string;
+    missingLegalPages: string;
+    seoHealth: string;
+    lastEdited: string;
+    lastEditedNever: string;
+    completionLabel: string;
+    recommendedNext: string;
+    recommendAddTitles: string;
+    recommendFixSeo: string;
+    recommendPublish: string;
+    recommendNone: string;
+    openAction: string;
+    backToPages: string;
+    groupContent: string;
+    groupSeo: string;
+    groupSharing: string;
+    groupAdvanced: string;
+    groupAdvancedHtml: string;
+    seoExplainDesc: string;
+    seoTitleHelp: string;
+    seoDescriptionHelp: string;
+    seoCanonicalHelp: string;
+    seoRobotsHelp: string;
+    sharingExplain: string;
+    mediaSelect: string;
+    mediaReplace: string;
+    mediaRemove: string;
+    mediaAlt: string;
+    mediaCaption: string;
+    emptyStateGuideTitle: string;
+    emptyStateGuideBody: string;
+    seoStatusGood: string;
+    seoStatusPartial: string;
+    seoStatusWarning: string;
+    seoStatusMissing: string;
+    needsAttention: string;
+    legal: {
+      about: { label: string; why: string };
+      contacts: { label: string; why: string };
+      privacy: { label: string; why: string };
+      terms: { label: string; why: string };
+      cookies: { label: string; why: string };
+      delivery: { label: string; why: string };
+      returns: { label: string; why: string };
+      faq: { label: string; why: string };
+    };
+  };
   widgets: {
     unavailable: string;
   };