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/EventBadges.svelte

@@ -34,12 +34,12 @@
     {/if}
     {#if locationText}
       {#if locationHref}
-        <a href={locationHref} target={locationHref.startsWith('#') ? undefined : '_blank'} rel={locationHref.startsWith('#') ? undefined : 'noopener noreferrer'} class="inline-flex shrink-0 items-center gap-1.5 whitespace-nowrap rounded-full bg-neutral-800 text-neutral-50! px-3 py-1 text-[.65rem] shadow-sm hover:bg-neutral-700 transition-colors no-underline!">
+        <a href={locationHref} target={locationHref.startsWith('#') ? undefined : '_blank'} rel={locationHref.startsWith('#') ? undefined : 'noopener noreferrer'} class="inline-flex shrink-0 items-center gap-1.5 whitespace-nowrap rounded-full bg-stein-800 text-stein-50! px-3 py-1 text-[.65rem] shadow-sm hover:bg-stein-700 transition-colors no-underline!">
           <Icon icon="mdi:map-marker" class="size-3.5 shrink-0 opacity-90" aria-hidden="true" />
           {locationText}
         </a>
       {:else}
-        <span class="inline-flex shrink-0 items-center gap-1.5 whitespace-nowrap rounded-full bg-neutral-800 text-neutral-50 px-3 py-1 text-[.65rem] font-medium shadow-sm no-underline! [text-decoration:none]">
+        <span class="inline-flex shrink-0 items-center gap-1.5 whitespace-nowrap rounded-full bg-stein-800 text-stein-50 px-3 py-1 text-[.65rem] font-medium shadow-sm no-underline! [text-decoration:none]">
           <Icon icon="mdi:map-marker" class="size-3.5 shrink-0 opacity-90" aria-hidden="true" />
           {locationText}
         </span>