style(design): consistency sweep + UX upgrades

- Palette: gray/zinc/slate/neutral → stein, red → fire, amber → erde,
  sky → himmel, green → wald
- Footer: replaced raw rgb with stein tokens
- Radius: unified to rounded-xs across cards, buttons, inputs, pagination
- Buttons: .btn-primary/.btn-secondary now font-medium; added secondary
- Card hover: -translate-y-0.5 + shadow + wald-300 border
- Header active link: wald border-bottom + wald-700 text
- Mobile nav: bigger touch targets + wald active accent
- Pagination: prev/next text labels + wald-500 active state with
  separated shape/color classes to avoid Tailwind conflicts
- Lead paragraph: scoped .markdown > p:first-child for top-level
  MarkdownBlock only via [data-block-type="markdown"]
- Section dividers: subtle wald-200 gradient between content rows
- Global focus-visible ring (wald-500)
- Inline hex → palette tokens (Badge amber, Tag custom-color contrast)
- Font weights snapped to design system (300/400/500/600/700)
- transition-all → transition-colors where only color changes
- Removed em-dashes from user-visible templates

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/lib/components/blocks/DeadlineBannerBlock.svelte

@@ -81,9 +81,9 @@
 
   const variantClasses = $derived(
     variant === "urgent"
-      ? "bg-amber-100 text-amber-900"
+      ? "bg-erde-100 text-erde-900"
       : variant === "info"
-        ? "bg-sky-100 text-sky-900"
+        ? "bg-himmel-100 text-himmel-900"
         : "bg-wald-500 text-wald-50",
   );
   const iconName = $derived(
@@ -101,14 +101,14 @@
     {#snippet inner()}
       <div class="container-custom flex flex-wrap sm:flex-nowrap items-center gap-x-2 gap-y-1 px-4 py-2 text-xs sm:text-sm">
         {#if dateStr}
-          <span class="inline-flex items-center rounded-md bg-white/50 text-wald-900 px-2 py-0.5 text-sm sm:text-base font-bold whitespace-nowrap shrink-0">
+          <span class="inline-flex items-center rounded-xs bg-white/50 text-wald-900 px-2 py-0.5 text-sm sm:text-base font-bold whitespace-nowrap shrink-0">
             <span class="inline-flex items-center gap-1.5">
               <Icon icon={iconName} class="size-4 shrink-0" aria-hidden="true" />
               {dateStr}
             </span>
             {#if countdownStr}
               <span
-                class="ml-0 inline-flex min-w-0 max-w-0 scale-[0.96] items-center overflow-hidden whitespace-nowrap rounded-md border border-transparent py-0.5 text-[0.6rem] font-semibold uppercase tracking-wide opacity-0 transition-[max-width,margin,opacity,transform,padding,border-color] duration-200 ease-out group-hover:ml-2 group-hover:max-w-48 group-hover:border-wald-900 group-hover:px-2 group-hover:opacity-100 group-hover:scale-100 group-focus-within:ml-2 group-focus-within:max-w-48 group-focus-within:border-wald-900 group-focus-within:px-2 group-focus-within:opacity-100 group-focus-within:scale-100"
+                class="ml-0 inline-flex min-w-0 max-w-0 scale-[0.96] items-center overflow-hidden whitespace-nowrap rounded-xs border border-transparent py-0.5 text-[0.6rem] font-semibold uppercase tracking-wide opacity-0 transition-[max-width,margin,opacity,transform,padding,border-color] duration-200 ease-out group-hover:ml-2 group-hover:max-w-48 group-hover:border-wald-900 group-hover:px-2 group-hover:opacity-100 group-hover:scale-100 group-focus-within:ml-2 group-focus-within:max-w-48 group-focus-within:border-wald-900 group-focus-within:px-2 group-focus-within:opacity-100 group-focus-within:scale-100"
               >
                 {countdownStr}
               </span>