feat(calendar): compact variant for next-events teaser

Calendar block now supports variant: "default" | "compact".
- default = full calendar (unchanged)
- compact = next N events (default 3) + link to a target page

New CalendarCompactBlock.svelte: small card with month/day badge,
title, date/time/location line, "Alle kommenden Termine →" footer
link resolved from the schema's linkTo reference. Filters to future
events (12h tolerance for running ones).

BlockRenderer dispatches by block.variant inside the calendar case.
Schema (cms_content/_types/core/calendar.json5) adds variant + linkTo
+ limit fields.

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

src/lib/components/BlockRenderer.svelte

@@ -14,6 +14,7 @@
   import PostOverviewBlock from "./blocks/PostOverviewBlock.svelte";
   import SearchableTextBlock from "./blocks/SearchableTextBlock.svelte";
   import CalendarBlock from "./blocks/CalendarBlock.svelte";
+  import CalendarCompactBlock from "./blocks/CalendarCompactBlock.svelte";
   import OrganisationsBlock from "./blocks/OrganisationsBlock.svelte";
   import OpnFormBlock from "./blocks/OpnFormBlock.svelte";
   import InternalComponentBlock from "./blocks/InternalComponentBlock.svelte";
@@ -82,7 +83,11 @@
 {:else if type === "searchable_text"}
   <SearchableTextBlock block={block as SearchableTextBlockData} translations={translations} />
 {:else if type === "calendar"}
-  <CalendarBlock block={block as CalendarBlockData} translations={translations} />
+  {#if (block as CalendarBlockData).variant === "compact"}
+    <CalendarCompactBlock block={block as CalendarBlockData} translations={translations} />
+  {:else}
+    <CalendarBlock block={block as CalendarBlockData} translations={translations} />
+  {/if}
 {:else if type === "organisations"}
   <OrganisationsBlock block={block as OrganisationsBlockData} />
 {:else if type === "opnform"}