style(documents): bump right-column font-size from xs to sm in list rows

The 12px text felt cramped next to the larger 120×168 thumbnail. Lift
the date / VON / AN / progress label to 14px so the row reads
comfortably without changing the width or the row height.

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

frontend/src/lib/components/DocumentRow.svelte

@@ -160,7 +160,7 @@ function safeTagColor(color: string | null | undefined): string {
 			</div>
 
 			<!-- Right column — desktop only -->
-			<div class="hidden flex-col gap-2 pl-4 font-sans text-xs text-ink-2 sm:flex sm:w-44 lg:w-56">
+			<div class="hidden flex-col gap-2 pl-4 font-sans text-sm text-ink-2 sm:flex sm:w-44 lg:w-56">
 				<div>
 					{doc.documentDate ? formatDate(doc.documentDate) : '—'}
 				</div>