style(search): improve mark hover contrast, remove no-op class, italicize snippet

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

frontend/src/routes/DocumentList.svelte

@@ -91,7 +91,8 @@ const showDividers = $derived(groupedDocuments.length >= 2);
 									<div class="mb-2 flex items-baseline justify-between">
 										<h3 class="font-serif text-xl font-medium text-ink group-hover:underline">
 											{#each titleSegments as seg, i (i)}
-												{#if seg.highlight}<mark class="bg-accent/20 text-inherit not-italic"
+												{#if seg.highlight}<mark
+														class="bg-accent/20 text-inherit group-hover:bg-accent/30"
 														>{seg.text}</mark
 													>{:else}{seg.text}{/if}
 											{/each}
@@ -125,7 +126,7 @@ const showDividers = $derived(groupedDocuments.length >= 2);
 									{#if snippet}
 										<p
 											data-testid="search-snippet"
-											class="mb-4 line-clamp-2 font-sans text-sm text-ink-2"
+											class="mb-4 line-clamp-2 font-sans text-sm text-ink-2 italic"
 										>
 											<span class="sr-only">Fundstelle: </span>{snippet}
 										</p>