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/SearchableTextBlock.svelte

@@ -184,7 +184,7 @@
         <Tooltip content={helpTooltipText} placement="top">
           <button
             type="button"
-            class="shrink-0 p-1.5 rounded-md text-himmel-500 hover:text-himmel-700 hover:bg-himmel-50 transition-colors focus:outline-none focus:ring-2 focus:ring-wald-500 focus:ring-offset-1"
+            class="shrink-0 p-1.5 rounded-xs text-himmel-500 hover:text-himmel-700 hover:bg-himmel-50 transition-colors focus:outline-none focus:ring-2 focus:ring-wald-500 focus:ring-offset-1"
             aria-label={t(T.searchable_text_help_aria)}
           >
             <Icon
@@ -197,7 +197,7 @@
         <input
           type="search"
           placeholder={t(T.searchable_text_placeholder)}
-          class="w-full text-sm px-4 py-2.5 pr-10 border border-stein-200 rounded-md focus:outline-none focus:ring-2 focus:ring-wald-500 focus:border-wald-400 bg-stein-0 text-stein-900 placeholder:text-stein-400"
+          class="w-full text-sm px-4 py-2.5 pr-10 border border-stein-200 rounded-xs focus:outline-none focus:ring-2 focus:ring-wald-500 focus:border-wald-400 bg-stein-0 text-stein-900 placeholder:text-stein-400"
           bind:value={searchQuery}
           oninput={(e) => (searchQuery = (e.target as HTMLInputElement).value)}
           aria-label={t(T.searchable_text_search_aria)}
@@ -205,7 +205,7 @@
         {#if searchQuery}
           <button
             type="button"
-            class="absolute right-9 top-1/2 -translate-y-1/2 p-1.5 rounded-md hover:bg-stein-200 text-stein-500 hover:text-stein-700 transition-colors"
+            class="absolute right-9 top-1/2 -translate-y-1/2 p-1.5 rounded-xs hover:bg-stein-200 text-stein-500 hover:text-stein-700 transition-colors"
             onclick={() => (searchQuery = "")}
             aria-label={t(T.searchable_text_clear_search)}
           >
@@ -290,7 +290,7 @@
           <div class="flex justify-end mb-3 -mt-1">
             <button
               type="button"
-              class="inline-flex items-center gap-1.5 px-2.5 py-1.5 text-xs font-medium rounded-md border border-stein-200 bg-stein-50 text-stein-700 hover:bg-wald-50 hover:border-wald-200 hover:text-wald-800 transition-colors"
+              class="inline-flex items-center gap-1.5 px-2.5 py-1.5 text-xs font-medium rounded-xs border border-stein-200 bg-stein-50 text-stein-700 hover:bg-wald-50 hover:border-wald-200 hover:text-wald-800 transition-colors"
               onclick={(e) => {
                 e.preventDefault();
                 copyFragmentContent(fragment, i);