Align public messaging and add news banners

shared/utils/news.ts

@@ -6,6 +6,7 @@ export interface NewsPost {
   body: string
   html: string
   readingTime: string
+  bannerFile: string
 }
 
 interface FrontMatter {
@@ -15,6 +16,7 @@ interface FrontMatter {
   excerpt?: string
   description?: string
   readingTime?: string
+  banner?: string
 }
 
 const rawNewsModules = import.meta.glob('~~/content/news/*.md', {
@@ -51,6 +53,7 @@ function parseNewsFile(path: string, raw: string): NewsPost | null {
   const excerpt = truncateText(excerptSource || firstParagraph(cleanBody), 220)
   const html = markdownToHtml(cleanBody)
   const readingTime = attributes.readingTime || formatReadingTime(cleanBody)
+  const bannerFile = normalizeBannerFile(attributes.banner, slug)
 
   return {
     slug,
@@ -60,6 +63,7 @@ function parseNewsFile(path: string, raw: string): NewsPost | null {
     body: cleanBody,
     html,
     readingTime,
+    bannerFile,
   }
 }
 
@@ -146,6 +150,14 @@ function formatReadingTime(content: string): string {
   return `${minutes} Min Lesezeit`
 }
 
+function normalizeBannerFile(banner: string | undefined, slug: string): string {
+  const value = (banner || '').trim()
+  if (!value) {
+    return `${slug}.svg`
+  }
+  return value.includes('.') ? value : `${value}.svg`
+}
+
 function markdownToHtml(markdown: string): string {
   const lines = markdown.split(/\r?\n/)
   let html = ''