windkarte: Rechtskräftig default hidden, remove Entwurf-2-voraussichtlich, 2km/5km rings on by default

- Hide status badge for rechtskraeftig in WindAreaPanel
- Default hiddenStatuses=["rechtskraeftig"] so polygons start hidden
- Fix: call restyleAll after geojsonLayer init so initial hidden state applies
- Default hiddenRings=[] so 2km+5km buffer rings show on selection
- Remove entwurf_2_voraussichtlich from legend
- Lower maxZoom 12→11 for more context on feature select

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

src/lib/components/WindAreaPanel.svelte

@@ -54,7 +54,7 @@
       <div class="min-w-0">
         <div class="flex items-center gap-2 flex-wrap">
           <span class="text-xl font-semibold text-stein-800">{area.gebiets_nr}</span>
-          {#if area.status}
+          {#if area.status && area.status !== 'rechtskraeftig'}
             <span class="rounded-full px-2 py-0.5 text-xs font-medium {STATUS_CLASS[area.status] ?? 'bg-stein-100 text-stein-600'}">
               {t(STATUS_KEY[area.status] ?? area.status)}
             </span>