feat(windkarte): wind_map referenziert wind_area explizit

areas-Feld im Schema + Block-Logik: referenzierte Slugs werden einzeln
gefetcht. Leer = alle published areas als Fallback. Ermöglicht verschiedene
Karten-Blöcke mit unterschiedlichen Gebiet-Subsets.

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

src/lib/block-types.ts

@@ -428,4 +428,6 @@ export interface WindMapBlockData {
   name?: string;
   title?: string;
   subtitle?: string;
+  /** Explizite Auswahl von wind_area-Slugs. Leer/null = alle published areas. */
+  areas?: (string | { _slug: string;[key: string]: unknown })[];
 }

src/lib/components/blocks/WindkarteBlock.svelte

@@ -25,12 +25,29 @@
 
   onMount(async () => {
     try {
-      const res = await fetch(`${CMS_BASE}/api/content/wind_area?limit=100`, {
-        signal: AbortSignal.timeout(6_000),
-      });
-      if (res.ok) {
-        const data = await res.json();
-        areas = data.items ?? [];
+      const slugs = (block.areas ?? [])
+        .map((a) => (typeof a === "string" ? a : a._slug))
+        .filter(Boolean);
+
+      if (slugs.length > 0) {
+        // Fetch only the explicitly referenced areas in parallel
+        const results = await Promise.all(
+          slugs.map((slug) =>
+            fetch(`${CMS_BASE}/api/content/wind_area/${slug}`, {
+              signal: AbortSignal.timeout(6_000),
+            }).then((r) => (r.ok ? r.json() : null))
+          )
+        );
+        areas = results.filter((r): r is WindArea => r !== null);
+      } else {
+        // Fallback: all published areas
+        const res = await fetch(`${CMS_BASE}/api/content/wind_area?limit=100`, {
+          signal: AbortSignal.timeout(6_000),
+        });
+        if (res.ok) {
+          const data = await res.json();
+          areas = data.items ?? [];
+        }
       }
     } catch {
       // Map renders without CMS metadata — GeoJSON tooltips still work