feat: Social-Bild-Generator auch für Posts (Endpoint, Modal, PostActions-Button)

Neuer Endpoint /api/social/post/[slug] mit gleichem Pattern wie für
Termine: Logo, Tag-Pill aus Title/Tags-Keywords (Presse, Demo,
Rückblick, Interview, Studie, Rechtlich, Meinung etc.), Datum,
Headline mit dynamischer Fontsize, Subheadline/Excerpt-Snippet, QR
zum Beitrag, Footer. 3 Formate × 3 Themes wie Kalender.

SocialImageModal in eigene wiederverwendbare Komponente extrahiert
und sowohl im PostActions als auch im CalendarBlock eingebunden.
PostActions akzeptiert socialSlug-Prop und blendet bei vorhandenem
Slug einen Modal-Trigger-Button neben den anderen Aktions-Icons ein.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/components/PostActions.svelte

@@ -5,6 +5,8 @@
   import { useTranslate, T } from "$lib/translations";
   import QrButton from "$lib/components/QrButton.svelte";
 
+  import SocialImageModal from "$lib/components/SocialImageModal.svelte";
+
   let {
     url,
     title,
@@ -12,6 +14,7 @@
     commentPageId = null,
     commentEnvironment,
     commentTargetId = "comments-section",
+    socialSlug = null,
     class: cls = "",
   }: {
     /** Absolute URL of the page being shared. */
@@ -26,9 +29,13 @@
     commentEnvironment?: string;
     /** DOM id of the comment accordion (used by the count-badge click). */
     commentTargetId?: string;
+    /** Wenn gesetzt: zeigt Social-Bild-Button, der Modal öffnet. */
+    socialSlug?: string | null;
     class?: string;
   } = $props();
 
+  let socialModalOpen = $state(false);
+
   const t = useTranslate();
 
   // ── Comment count fetch (only when commentPageId is set) ────────────────
@@ -195,6 +202,17 @@
     >
       <Icon icon="mdi:printer-outline" class="size-3.5" />
     </button>
+    {#if socialSlug}
+      <button
+        type="button"
+        onclick={() => (socialModalOpen = true)}
+        class="inline-flex items-center px-2.5 py-1 text-stein-600 hover:bg-stein-50 hover:text-stein-900 transition-colors"
+        aria-label="Social-Bild Vorschau"
+        title="Social-Bild Vorschau (für Instagram, Facebook, WhatsApp)"
+      >
+        <Icon icon="mdi:image-outline" class="size-3.5" />
+      </button>
+    {/if}
     <QrButton
       value={url}
       label={title}
@@ -203,6 +221,17 @@
     />
   </div>
 
+  {#if socialSlug}
+    <SocialImageModal
+      open={socialModalOpen}
+      title={title}
+      slug={socialSlug}
+      endpointBase="/api/social/post"
+      downloadPrefix="beitrag"
+      onclose={() => (socialModalOpen = false)}
+    />
+  {/if}
+
   {#if readingTimeMinutes != null && readingTimeMinutes > 0}
     <span
       class="inline-flex items-center gap-1 rounded-full border border-stein-200 bg-white px-2.5 py-1 text-xs text-stein-500"

src/lib/components/SocialImageModal.svelte

@@ -0,0 +1,140 @@
+<script lang="ts">
+  import Icon from "@iconify/svelte";
+  import "$lib/iconify-offline";
+
+  let {
+    open,
+    title,
+    slug,
+    endpointBase,
+    downloadPrefix = "social",
+    onclose,
+  }: {
+    open: boolean;
+    title: string;
+    slug: string;
+    /** "/api/social/calendar" oder "/api/social/post" */
+    endpointBase: string;
+    /** Prefix für Download-Dateinamen, z.B. "termin" oder "beitrag" */
+    downloadPrefix?: string;
+    onclose: () => void;
+  } = $props();
+
+  let theme = $state<"wald" | "transparent-onlight" | "transparent-ondark">("wald");
+
+  const themeQ = $derived(theme === "wald" ? "" : `&theme=${theme}`);
+  const ogUrl = $derived(`${endpointBase}/${slug}?format=og${themeQ}`);
+  const sqUrl = $derived(`${endpointBase}/${slug}?format=square${themeQ}`);
+  const storyUrl = $derived(`${endpointBase}/${slug}?format=story${themeQ}`);
+  const previewBg = $derived(
+    theme === "wald"
+      ? "bg-stein-50"
+      : theme === "transparent-onlight"
+        ? "bg-[repeating-linear-gradient(45deg,#f5f5f4,#f5f5f4_10px,#e7e5e4_10px,#e7e5e4_20px)]"
+        : "bg-[repeating-linear-gradient(45deg,#292524,#292524_10px,#1c1917_10px,#1c1917_20px)]",
+  );
+</script>
+
+{#if open}
+  <div
+    class="fixed inset-0 z-[100] flex items-center justify-center bg-black/80 p-4"
+    role="dialog"
+    aria-modal="true"
+    aria-label="Social-Bild-Vorschau"
+    onclick={onclose}
+    onkeydown={(e) => { if (e.key === 'Escape') onclose(); }}
+    tabindex="-1"
+  >
+    <div
+      class="relative max-h-[92vh] w-full max-w-5xl overflow-y-auto rounded-lg bg-white p-5 shadow-2xl"
+      onclick={(e) => e.stopPropagation()}
+      role="presentation"
+    >
+      <div class="mb-4 flex items-start justify-between gap-3">
+        <div class="min-w-0">
+          <p class="text-xs uppercase tracking-wider text-stein-500">Social-Bild</p>
+          <p class="truncate text-sm font-semibold text-stein-800">{title}</p>
+        </div>
+        <button
+          type="button"
+          onclick={onclose}
+          class="shrink-0 text-stein-400 hover:text-stein-700"
+          aria-label="Schließen"
+        >
+          <Icon icon="mdi:close" class="size-5" />
+        </button>
+      </div>
+
+      <div class="mb-4 rounded-lg border border-stein-200 bg-stein-50 p-3">
+        <p class="mb-2 text-[11px] font-medium uppercase tracking-wider text-stein-500">Hintergrund</p>
+        <div class="flex flex-wrap gap-2">
+          <button
+            type="button"
+            onclick={() => (theme = "wald")}
+            class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-xs font-medium transition
+              {theme === 'wald' ? 'border-wald-500 bg-wald-100 text-wald-800' : 'border-stein-300 bg-white text-stein-700 hover:bg-stein-50'}"
+          >
+            <span class="size-3 rounded-full bg-gradient-to-br from-wald-900 to-wald-600"></span>
+            Wald (Standard)
+          </button>
+          <button
+            type="button"
+            onclick={() => (theme = "transparent-onlight")}
+            class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-xs font-medium transition
+              {theme === 'transparent-onlight' ? 'border-wald-500 bg-wald-100 text-wald-800' : 'border-stein-300 bg-white text-stein-700 hover:bg-stein-50'}"
+            title="Transparenter Hintergrund mit dunklem Text"
+          >
+            <span class="size-3 rounded-full border border-stein-300 bg-[repeating-linear-gradient(45deg,#fff,#fff_2px,#e5e5e5_2px,#e5e5e5_4px)]"></span>
+            Transparent · helle Hintergründe
+          </button>
+          <button
+            type="button"
+            onclick={() => (theme = "transparent-ondark")}
+            class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-xs font-medium transition
+              {theme === 'transparent-ondark' ? 'border-wald-500 bg-wald-100 text-wald-800' : 'border-stein-300 bg-white text-stein-700 hover:bg-stein-50'}"
+            title="Transparenter Hintergrund mit hellem Text"
+          >
+            <span class="size-3 rounded-full border border-stein-300 bg-[repeating-linear-gradient(45deg,#1c1917,#1c1917_2px,#44403c_2px,#44403c_4px)]"></span>
+            Transparent · dunkle Hintergründe
+          </button>
+        </div>
+        {#if theme !== "wald"}
+          <p class="mt-2 text-[10px] text-stein-500">
+            Vorschau-Hintergrund zeigt nur, wie der Text aussieht — heruntergeladene PNG hat echten Alpha-Kanal.
+          </p>
+        {/if}
+      </div>
+
+      <div class="grid gap-4 sm:grid-cols-3">
+        <div class="flex flex-col gap-2">
+          <p class="text-xs font-medium text-stein-600">Quer · 1200 × 630</p>
+          <img src={ogUrl} alt="Social-Bild Quer" class="w-full rounded-sm border border-stein-200 {previewBg}" loading="eager" />
+          <a href={ogUrl} download={`${downloadPrefix}-${slug}-og-${theme}.png`} class="btn-outline btn-sm justify-center no-underline!">
+            <Icon icon="mdi:download" class="size-3.5" />
+            Quer herunterladen
+          </a>
+        </div>
+        <div class="flex flex-col gap-2">
+          <p class="text-xs font-medium text-stein-600">Quadrat · 1080 × 1080</p>
+          <img src={sqUrl} alt="Social-Bild Quadrat" class="mx-auto w-full rounded-sm border border-stein-200 {previewBg}" loading="eager" />
+          <a href={sqUrl} download={`${downloadPrefix}-${slug}-square-${theme}.png`} class="btn-outline btn-sm justify-center no-underline!">
+            <Icon icon="mdi:download" class="size-3.5" />
+            Quadrat herunterladen
+          </a>
+        </div>
+        <div class="flex flex-col gap-2">
+          <p class="text-xs font-medium text-stein-600">Story · 1080 × 1920</p>
+          <img src={storyUrl} alt="Social-Bild Story" class="mx-auto w-auto max-h-[280px] rounded-sm border border-stein-200 {previewBg}" loading="eager" />
+          <a href={storyUrl} download={`${downloadPrefix}-${slug}-story-${theme}.png`} class="btn-outline btn-sm justify-center no-underline!">
+            <Icon icon="mdi:download" class="size-3.5" />
+            Story herunterladen
+          </a>
+        </div>
+      </div>
+
+      <p class="mt-4 text-[11px] text-stein-400">
+        Quer: Facebook/Twitter/Link-Preview. Quadrat: Instagram-Feed. Story: Instagram/WhatsApp Story.
+      </p>
+    </div>
+  </div>
+{/if}

src/lib/components/blocks/CalendarBlock.svelte

@@ -16,6 +16,7 @@
     import "$lib/iconify-offline";
     import Icon from "@iconify/svelte";
     import ImageModal from "$lib/components/ImageModal.svelte";
+    import SocialImageModal from "$lib/components/SocialImageModal.svelte";
 
     type EventCardItem = CalendarItemData & {
         start: Date;
@@ -447,7 +448,6 @@
     let modalImage = $state<{ src: string; alt: string } | null>(null);
     let linkedSlug = $state<string | null>(null);
     let socialModal = $state<{ slug: string; title: string } | null>(null);
-    let socialTheme = $state<"wald" | "transparent-onlight" | "transparent-ondark">("wald");
 
     function openSocial(item: EventCardItem) {
         if (!item._slug) return;
@@ -1294,146 +1294,14 @@
 {/if}
 
 {#if socialModal}
-    {@const themeQ = socialTheme === "wald" ? "" : `&theme=${socialTheme}`}
+    <SocialImageModal
-    {@const ogUrl = `/api/social/calendar/${socialModal.slug}?format=og${themeQ}`}
+        open={true}
-    {@const sqUrl = `/api/social/calendar/${socialModal.slug}?format=square${themeQ}`}
+        title={socialModal.title}
-    {@const storyUrl = `/api/social/calendar/${socialModal.slug}?format=story${themeQ}`}
+        slug={socialModal.slug}
-    {@const previewBg =
+        endpointBase="/api/social/calendar"
-        socialTheme === "wald"
+        downloadPrefix="termin"
-            ? "bg-stein-50"
+        onclose={closeSocial}
-            : socialTheme === "transparent-onlight"
+    />
-                ? "bg-[repeating-linear-gradient(45deg,#f5f5f4,#f5f5f4_10px,#e7e5e4_10px,#e7e5e4_20px)]"
-                : "bg-[repeating-linear-gradient(45deg,#292524,#292524_10px,#1c1917_10px,#1c1917_20px)]"}
-    <div
-        class="fixed inset-0 z-[100] flex items-center justify-center bg-black/80 p-4"
-        role="dialog"
-        aria-modal="true"
-        aria-label="Social-Bild-Vorschau"
-        onclick={closeSocial}
-        onkeydown={(e) => { if (e.key === 'Escape') closeSocial(); }}
-        tabindex="-1"
-    >
-        <div
-            class="relative max-h-[92vh] w-full max-w-5xl overflow-y-auto rounded-lg bg-white p-5 shadow-2xl"
-            onclick={(e) => e.stopPropagation()}
-            role="presentation"
-        >
-            <div class="mb-4 flex items-start justify-between gap-3">
-                <div class="min-w-0">
-                    <p class="text-xs uppercase tracking-wider text-stein-500">Social-Bild</p>
-                    <p class="truncate text-sm font-semibold text-stein-800">{socialModal.title}</p>
-                </div>
-                <button
-                    type="button"
-                    onclick={closeSocial}
-                    class="shrink-0 text-stein-400 hover:text-stein-700"
-                    aria-label="Schließen"
-                >
-                    <Icon icon="mdi:close" class="size-5" />
-                </button>
-            </div>
-
-            <!-- Theme-Selector -->
-            <div class="mb-4 rounded-lg border border-stein-200 bg-stein-50 p-3">
-                <p class="mb-2 text-[11px] font-medium uppercase tracking-wider text-stein-500">Hintergrund</p>
-                <div class="flex flex-wrap gap-2">
-                    <button
-                        type="button"
-                        onclick={() => (socialTheme = "wald")}
-                        class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-xs font-medium transition
-                            {socialTheme === 'wald' ? 'border-wald-500 bg-wald-100 text-wald-800' : 'border-stein-300 bg-white text-stein-700 hover:bg-stein-50'}"
-                    >
-                        <span class="size-3 rounded-full bg-gradient-to-br from-wald-900 to-wald-600"></span>
-                        Wald (Standard)
-                    </button>
-                    <button
-                        type="button"
-                        onclick={() => (socialTheme = "transparent-onlight")}
-                        class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-xs font-medium transition
-                            {socialTheme === 'transparent-onlight' ? 'border-wald-500 bg-wald-100 text-wald-800' : 'border-stein-300 bg-white text-stein-700 hover:bg-stein-50'}"
-                        title="Transparenter Hintergrund mit dunklem Text — für eigene helle Bild-Hintergründe"
-                    >
-                        <span class="size-3 rounded-full border border-stein-300 bg-[repeating-linear-gradient(45deg,#fff,#fff_2px,#e5e5e5_2px,#e5e5e5_4px)]"></span>
-                        Transparent · für helle Hintergründe
-                    </button>
-                    <button
-                        type="button"
-                        onclick={() => (socialTheme = "transparent-ondark")}
-                        class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-xs font-medium transition
-                            {socialTheme === 'transparent-ondark' ? 'border-wald-500 bg-wald-100 text-wald-800' : 'border-stein-300 bg-white text-stein-700 hover:bg-stein-50'}"
-                        title="Transparenter Hintergrund mit hellem Text — für eigene dunkle Bild-Hintergründe"
-                    >
-                        <span class="size-3 rounded-full border border-stein-300 bg-[repeating-linear-gradient(45deg,#1c1917,#1c1917_2px,#44403c_2px,#44403c_4px)]"></span>
-                        Transparent · für dunkle Hintergründe
-                    </button>
-                </div>
-                {#if socialTheme !== "wald"}
-                    <p class="mt-2 text-[10px] text-stein-500">
-                        Vorschau-Hintergrund zeigt nur, wie der Text aussieht — die heruntergeladene PNG hat echten Alpha-Kanal.
-                    </p>
-                {/if}
-            </div>
-
-            <div class="grid gap-4 sm:grid-cols-3">
-                <div class="flex flex-col gap-2">
-                    <p class="text-xs font-medium text-stein-600">Quer · 1200 × 630</p>
-                    <img
-                        src={ogUrl}
-                        alt="Social-Bild Quer"
-                        class="w-full rounded-sm border border-stein-200 {previewBg}"
-                        loading="eager"
-                    />
-                    <a
-                        href={ogUrl}
-                        download={`termin-${socialModal.slug}-og-${socialTheme}.png`}
-                        class="btn-outline btn-sm justify-center no-underline!"
-                    >
-                        <Icon icon="mdi:download" class="size-3.5" />
-                        Quer herunterladen
-                    </a>
-                </div>
-                <div class="flex flex-col gap-2">
-                    <p class="text-xs font-medium text-stein-600">Quadrat · 1080 × 1080</p>
-                    <img
-                        src={sqUrl}
-                        alt="Social-Bild Quadrat"
-                        class="mx-auto w-full rounded-sm border border-stein-200 {previewBg}"
-                        loading="eager"
-                    />
-                    <a
-                        href={sqUrl}
-                        download={`termin-${socialModal.slug}-square-${socialTheme}.png`}
-                        class="btn-outline btn-sm justify-center no-underline!"
-                    >
-                        <Icon icon="mdi:download" class="size-3.5" />
-                        Quadrat herunterladen
-                    </a>
-                </div>
-                <div class="flex flex-col gap-2">
-                    <p class="text-xs font-medium text-stein-600">Story · 1080 × 1920</p>
-                    <img
-                        src={storyUrl}
-                        alt="Social-Bild Story"
-                        class="mx-auto w-auto max-h-[280px] rounded-sm border border-stein-200 {previewBg}"
-                        loading="eager"
-                    />
-                    <a
-                        href={storyUrl}
-                        download={`termin-${socialModal.slug}-story-${socialTheme}.png`}
-                        class="btn-outline btn-sm justify-center no-underline!"
-                    >
-                        <Icon icon="mdi:download" class="size-3.5" />
-                        Story herunterladen
-                    </a>
-                </div>
-            </div>
-
-            <p class="mt-4 text-[11px] text-stein-400">
-                Quer: Facebook/Twitter/Link-Preview. Quadrat: Instagram-Feed. Story: Instagram/WhatsApp Story.
-                Transparent-Varianten lassen sich als Overlay auf eigene Hintergründe in Stories einsetzen.
-            </p>
-        </div>
-    </div>
 {/if}
 
 <style>

src/routes/api/social/post/[slug]/+server.ts

@@ -0,0 +1,375 @@
+import type { RequestHandler } from "./$types";
+import { error } from "@sveltejs/kit";
+import satori from "satori";
+import { html as htmlToReact } from "satori-html";
+import { Resvg } from "@resvg/resvg-js";
+import { toBuffer as qrToBuffer } from "qrcode";
+import { env } from "$env/dynamic/public";
+import { getPostBySlug, getPageConfigs } from "$lib/cms";
+
+type Format = "og" | "square" | "story";
+type Theme = "wald" | "transparent-onlight" | "transparent-ondark";
+
+const SIZES: Record<Format, { w: number; h: number }> = {
+  og: { w: 1200, h: 630 },
+  square: { w: 1080, h: 1080 },
+  story: { w: 1080, h: 1920 },
+};
+
+const FONT_URLS: Record<string, string> = {
+  regular:
+    "https://fonts.gstatic.com/s/inter/v18/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuLyfMZhrib2Bg-4.ttf",
+  semibold:
+    "https://fonts.gstatic.com/s/inter/v18/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuFuYMZhrib2Bg-4.ttf",
+  bold: "https://fonts.gstatic.com/s/inter/v18/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuGKYMZhrib2Bg-4.ttf",
+};
+
+let fontCache: { regular: ArrayBuffer; semibold: ArrayBuffer; bold: ArrayBuffer } | null = null;
+let logoSvgCache: { svg: string; recolored: Record<string, string> } | null = null;
+
+async function loadFonts() {
+  if (fontCache) return fontCache;
+  const [regular, semibold, bold] = await Promise.all(
+    (["regular", "semibold", "bold"] as const).map(async (w) => {
+      const res = await fetch(FONT_URLS[w]);
+      if (!res.ok) throw new Error(`Font fetch failed (${w}): ${res.status}`);
+      return res.arrayBuffer();
+    }),
+  );
+  fontCache = { regular, semibold, bold };
+  return fontCache;
+}
+
+async function loadLogo(): Promise<string | null> {
+  if (logoSvgCache) return logoSvgCache.svg;
+  try {
+    const configs = await getPageConfigs({ locale: "de" });
+    const cfg = configs[0];
+    const rawLogo = (cfg as { logo?: unknown })?.logo;
+    const rawSrc =
+      typeof rawLogo === "string"
+        ? rawLogo
+        : (rawLogo as { src?: string } | undefined)?.src ?? null;
+    if (!rawSrc) return null;
+    const cmsBase = (env.PUBLIC_CMS_URL || "http://localhost:3000").replace(/\/$/, "");
+    const u = rawSrc.startsWith("//")
+      ? `https:${rawSrc}`
+      : rawSrc.startsWith("/")
+        ? `${cmsBase}${rawSrc}`
+        : rawSrc.startsWith("http")
+          ? rawSrc
+          : `${cmsBase}/api/assets/${rawSrc}`;
+    if (!u.split("?")[0].toLowerCase().endsWith(".svg")) return null;
+    const res = await fetch(u);
+    if (!res.ok) return null;
+    let text = (await res.text()).trim();
+    text = text.replace(/<\?xml[^?]*\?>/g, "").replace(/<!DOCTYPE[^>]*>/g, "").trim();
+    if (!text.startsWith("<svg")) return null;
+    logoSvgCache = { svg: text, recolored: {} };
+    return text;
+  } catch {
+    return null;
+  }
+}
+
+function colorizeLogo(svg: string, color: string): string {
+  if (!logoSvgCache) return svg;
+  if (logoSvgCache.recolored[color]) return logoSvgCache.recolored[color];
+  const recolored = svg
+    .replace(/fill="(?!none)[^"]*"/gi, `fill="${color}"`)
+    .replace(/stroke="(?!none)[^"]*"/gi, `stroke="${color}"`)
+    .replace(/currentColor/gi, color);
+  logoSvgCache.recolored[color] = recolored;
+  return recolored;
+}
+
+function formatDateLong(iso: string | undefined | null): string {
+  if (!iso) return "";
+  try {
+    return new Date(iso).toLocaleDateString("de-DE", {
+      day: "2-digit",
+      month: "long",
+      year: "numeric",
+    });
+  } catch {
+    return "";
+  }
+}
+
+const cache = new Map<string, { png: Buffer; ts: number }>();
+const CACHE_TTL = 10 * 60_000;
+const CACHE_VERSION = "v1";
+
+function parseFormat(v: string | null): Format {
+  if (v === "square") return "square";
+  if (v === "story") return "story";
+  return "og";
+}
+function parseTheme(v: string | null): Theme {
+  if (v === "transparent-ondark") return "transparent-ondark";
+  if (v === "transparent-onlight" || v === "transparent") return "transparent-onlight";
+  return "wald";
+}
+
+function escapeHtml(s: string): string {
+  return s.replace(/</g, "‹").replace(/>/g, "›");
+}
+
+function stripMd(s: string): string {
+  return s
+    .replace(/!\[[^\]]*\]\([^)]*\)/g, "")
+    .replace(/\[[^\]]*\]\([^)]*\)/g, "")
+    .replace(/[#*_`~>\[\]]/g, " ")
+    .replace(/\s+/g, " ")
+    .trim();
+}
+
+export const GET: RequestHandler = async ({ params, url, setHeaders }) => {
+  const slug = params.slug;
+  const formatParam = parseFormat(url.searchParams.get("format"));
+  const themeParam = parseTheme(url.searchParams.get("theme"));
+  const cacheKey = `${CACHE_VERSION}:${slug}:${formatParam}:${themeParam}`;
+  const now = Date.now();
+  const cached = cache.get(cacheKey);
+  if (cached && now - cached.ts < CACHE_TTL) {
+    setHeaders({
+      "content-type": "image/png",
+      "cache-control": "public, max-age=600, stale-while-revalidate=86400",
+    });
+    return new Response(new Uint8Array(cached.png), { status: 200 });
+  }
+
+  const itemRaw = await getPostBySlug(slug, { locale: "de" });
+  if (!itemRaw) throw error(404, "Beitrag nicht gefunden");
+  const post = itemRaw as typeof itemRaw & {
+    headline?: string;
+    linkName?: string;
+    subheadline?: string;
+    excerpt?: string;
+    content?: string;
+    tags?: unknown;
+    created?: string;
+    updated?: string;
+  };
+
+  const { w, h } = SIZES[formatParam];
+  const fonts = await loadFonts();
+  const logoSvg = await loadLogo();
+
+  const headline = (post.headline ?? post.linkName ?? "").trim();
+  const subheadline = (post.subheadline ?? "").trim();
+  const excerpt = (post.excerpt ?? "").trim();
+  const snippetSrc = subheadline || excerpt || stripMd(post.content ?? "");
+  const dateLabel = formatDateLong(post.updated ?? post.created);
+
+  // Tags → Pill (erster Tag oder Kategorie aus Inhalt erkennen)
+  const tagList = Array.isArray(post.tags)
+    ? (post.tags as unknown[]).map((t) =>
+        typeof t === "string" ? t : (t as { _slug?: string; name?: string })?.name ?? (t as { _slug?: string })?._slug ?? "",
+      )
+    : [];
+  const titleLower = headline.toLowerCase();
+  const tagPillInfo = (() => {
+    const candidates = [titleLower, ...tagList.map((t) => t.toLowerCase())];
+    const has = (kw: string) => candidates.some((c) => c.includes(kw));
+    if (has("pressemitteilung") || has("presse")) return { label: "Presse", color: "#b08a52" };
+    if (has("demo") || has("protest")) return { label: "Demo", color: "#e35651" };
+    if (has("rückblick") || has("retrospektive")) return { label: "Rückblick", color: "#5e6fa3" };
+    if (has("interview")) return { label: "Interview", color: "#436e85" };
+    if (has("studien") || has("studie") || has("forschung"))
+      return { label: "Studie", color: "#6e8c46" };
+    if (has("urteil") || has("gericht") || has("rechtlich"))
+      return { label: "Rechtlich", color: "#8a567a" };
+    if (has("kommentar") || has("lesermeinung") || has("meinung"))
+      return { label: "Meinung", color: "#7f8c6e" };
+    if (tagList[0]) {
+      const first = tagList[0].replace(/^tag-?/i, "").replace(/-/g, " ").trim();
+      if (first) return { label: first.slice(0, 20), color: "#3d6b4f" };
+    }
+    return { label: "Beitrag", color: "#3d6b4f" };
+  })();
+
+  const siteUrl = (env.PUBLIC_SITE_URL || "https://windwiderstand.de").replace(/\/$/, "");
+  const eventUrl = `${siteUrl}/post/${encodeURIComponent(slug)}`;
+
+  const isTransparent = themeParam !== "wald";
+  const isLight = themeParam === "transparent-ondark";
+  const palette = isTransparent
+    ? isLight
+      ? {
+          bg: "transparent",
+          text: "#ffffff",
+          textMute: "rgba(255,255,255,0.85)",
+          textDim: "rgba(255,255,255,0.7)",
+          accent: "#a8e6c0",
+          headerLabel: "rgba(255,255,255,0.75)",
+          footerSep: "rgba(255,255,255,0.25)",
+          qrBoxBg: "#ffffff",
+        }
+      : {
+          bg: "transparent",
+          text: "#0a2011",
+          textMute: "#1a4d28",
+          textDim: "#2d7a45",
+          accent: "#1a4d28",
+          headerLabel: "#236335",
+          footerSep: "rgba(10,32,17,0.25)",
+          qrBoxBg: "#0a2011",
+        }
+    : {
+        bg: "linear-gradient(135deg,#0a2011 0%,#12361c 55%,#1a4d28 100%)",
+        text: "#ffffff",
+        textMute: "#d9e8dc",
+        textDim: "#b3d1b9",
+        accent: "#7fb58a",
+        headerLabel: "#7fb58a",
+        footerSep: "#1a4d28",
+        qrBoxBg: "#ffffff",
+      };
+
+  const isStory = formatParam === "story";
+  const isSquare = formatParam === "square";
+  const verticalStack = isStory || isSquare;
+
+  // Dynamische Headline-Fontsize je Länge/Format
+  const hLen = headline.length;
+  const headlineFs = isStory
+    ? hLen > 70 ? 64 : 80
+    : isSquare
+      ? hLen > 60 ? 48 : 60
+      : hLen > 40 ? 42 : 56;
+  const subFs = isStory ? 32 : isSquare ? 26 : 24;
+  const datePillFs = isStory ? 26 : 20;
+  const padX = isStory ? 90 : isSquare ? 80 : 90;
+  const qrSize = isStory ? 260 : 170;
+  const headerFs = isStory ? 26 : 20;
+  const footerFs = isStory ? 24 : 20;
+
+  // Snippet clampen
+  const snipMaxLen = isStory ? 220 : isSquare ? 160 : 130;
+  const snipClamped = snippetSrc
+    ? snippetSrc.length > snipMaxLen
+      ? snippetSrc.slice(0, snipMaxLen - 3) + "…"
+      : snippetSrc
+    : "";
+
+  const headlineClamped = hLen > 140 ? headline.slice(0, 137) + "…" : headline;
+
+  const qrDark = "#0a2011";
+  const qrLight = "#ffffff";
+  const qrPngBuf = await qrToBuffer(eventUrl, {
+    errorCorrectionLevel: "M",
+    margin: 1,
+    scale: 8,
+    color: { dark: `${qrDark}ff`, light: `${qrLight}ff` },
+  });
+  const qrDataUrl = `data:image/png;base64,${qrPngBuf.toString("base64")}`;
+
+  const logoColor = palette.headerLabel;
+  const logoDataUrl = logoSvg
+    ? `data:image/svg+xml;base64,${Buffer.from(colorizeLogo(logoSvg, logoColor)).toString("base64")}`
+    : null;
+  const logoH = isStory ? 60 : isSquare ? 44 : 36;
+
+  // Tag-Pill rechts oben
+  const tagPill = `<div style="display:flex;align-items:center;background:${tagPillInfo.color};color:#ffffff;padding:6px 14px;border-radius:999px;font-size:${headerFs - 4}px;letter-spacing:0.12em;font-weight:700;text-transform:uppercase;">${escapeHtml(tagPillInfo.label)}</div>`;
+
+  const brandBlock = logoDataUrl
+    ? `<div style="display:flex;align-items:center;"><img src="${logoDataUrl}" width="${logoH}" height="${logoH}" style="width:${logoH}px;height:${logoH}px;" /><div style="display:flex;margin-left:14px;">Windwiderstand Thüringen</div></div>`
+    : `<div style="display:flex;">Windwiderstand Thüringen</div>`;
+
+  const headerRow = `
+    <div style="display:flex;justify-content:space-between;align-items:center;font-size:${headerFs}px;letter-spacing:0.18em;font-weight:600;color:${palette.headerLabel};text-transform:uppercase;">
+      ${brandBlock}
+      ${tagPill}
+    </div>
+  `;
+
+  // Datum-Pill (klein, oben-links nach Header)
+  const dateBlock = dateLabel
+    ? `<div style="display:flex;align-items:center;font-size:${datePillFs}px;font-weight:600;color:${palette.textDim};letter-spacing:0.05em;text-transform:uppercase;margin-top:${isStory ? 48 : 28}px;">${dateLabel}</div>`
+    : "";
+
+  const headlineBlock = `
+    <div style="display:flex;flex-direction:column;margin-top:${isStory ? 20 : 14}px;">
+      <div style="display:flex;font-size:${headlineFs}px;font-weight:700;color:${palette.text};line-height:1.1;letter-spacing:-0.015em;">${escapeHtml(headlineClamped)}</div>
+      ${
+        snipClamped
+          ? `<div style="display:flex;font-size:${subFs}px;font-weight:400;color:${palette.textMute};line-height:1.35;margin-top:${isStory ? 32 : 20}px;">${escapeHtml(snipClamped)}</div>`
+          : ""
+      }
+    </div>
+  `;
+
+  const qrAlign = verticalStack ? "flex-start" : "center";
+  const qrBlock = `
+    <div style="display:flex;flex-direction:column;align-items:${qrAlign};gap:8px;">
+      <div style="display:flex;background:${palette.qrBoxBg};padding:14px;border-radius:12px;">
+        <img src="${qrDataUrl}" style="width:${qrSize}px;height:${qrSize}px;" />
+      </div>
+      <div style="display:flex;font-size:${isStory ? 22 : 16}px;color:${palette.textDim};font-weight:500;letter-spacing:0.05em;">Beitrag lesen</div>
+    </div>
+  `;
+
+  const footerBlock = `
+    <div style="display:flex;justify-content:space-between;align-items:center;font-size:${footerFs}px;color:${palette.accent};border-top:1px solid ${palette.footerSep};padding-top:${isStory ? 24 : 18}px;margin-top:${isStory ? 36 : 28}px;flex-shrink:0;">
+      <div style="display:flex;align-items:center;font-weight:600;">windwiderstand.de</div>
+      <div style="display:flex;align-items:center;font-weight:500;letter-spacing:0.04em;">Mit Vernunft in die Zukunft</div>
+    </div>
+  `;
+
+  const mainArea = verticalStack
+    ? `
+      <div style="display:flex;flex-direction:column;flex:1;">
+        ${dateBlock}
+        ${headlineBlock}
+      </div>
+      <div style="display:flex;justify-content:flex-start;margin-top:${isStory ? 40 : 28}px;margin-bottom:${isStory ? 40 : 24}px;">
+        ${qrBlock}
+      </div>
+    `
+    : `
+      <div style="display:flex;flex:1;gap:40px;">
+        <div style="display:flex;flex-direction:column;flex:1;min-width:0;">
+          ${dateBlock}
+          ${headlineBlock}
+        </div>
+        ${qrBlock}
+      </div>
+    `;
+
+  const template = `
+    <div style="display:flex;flex-direction:column;width:${w}px;height:${h}px;background:${palette.bg};color:${palette.text};padding:${padX}px;font-family:Inter;position:relative;">
+      ${headerRow}
+      ${mainArea}
+      ${footerBlock}
+    </div>
+  `;
+
+  const reactLike = htmlToReact(template);
+
+  const svg = await satori(reactLike as Parameters<typeof satori>[0], {
+    width: w,
+    height: h,
+    fonts: [
+      { name: "Inter", data: fonts.regular, weight: 400, style: "normal" },
+      { name: "Inter", data: fonts.semibold, weight: 500, style: "normal" },
+      { name: "Inter", data: fonts.semibold, weight: 600, style: "normal" },
+      { name: "Inter", data: fonts.bold, weight: 700, style: "normal" },
+    ],
+  });
+
+  const resvg = new Resvg(svg, {
+    fitTo: { mode: "width", value: w },
+    background: isTransparent ? "rgba(0,0,0,0)" : undefined,
+  });
+  const png = resvg.render().asPng();
+  const pngBuf = Buffer.from(png);
+  cache.set(cacheKey, { png: pngBuf, ts: now });
+
+  setHeaders({
+    "content-type": "image/png",
+    "cache-control": "public, max-age=600, stale-while-revalidate=86400",
+  });
+  return new Response(new Uint8Array(pngBuf), { status: 200 });
+};

src/routes/post/[slug]/+page.server.ts

@@ -300,6 +300,7 @@ export const load: PageServerLoad = async ({ params, locals, url, setHeaders })
     commentPageId: showCommentSection ? slug : null,
     commentCount: showCommentSection ? (await getCommentCounts([slug]))[slug] ?? 0 : 0,
     canonicalUrl: canonical,
+    postSlug: slug,
     readingTimeMinutes,
     translations,
     seoTitle: post.seoTitle ?? postHeadline,

src/routes/post/[slug]/+page.svelte

@@ -72,6 +72,7 @@
       readingTimeMinutes={data.readingTimeMinutes}
       commentPageId={data.commentPageId}
       commentTargetId="comments-section"
+      socialSlug={data.postSlug}
     />
   </div>
 </div>