feat(briefwechsel): bump row typography and drop relative-year chip

The 168px-tall thumbnail tile was dominating rows where the text
column only rendered at text-xs / text-sm — visually the right
column sat half-empty. Three changes:

- Title: text-sm → text-lg
- Summary: text-sm → text-base
- Meta + tag chips: text-xs → text-sm

And remove the "vor N Jahren" chip entirely. The documentDate
in the meta row already carries the temporal context and the
chip was adding visual noise without new information.

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

frontend/src/lib/components/ThumbnailRow.svelte

@@ -2,7 +2,6 @@
 import ConversationThumbnail from '$lib/components/ConversationThumbnail.svelte';
 import TagChipList from '$lib/components/TagChipList.svelte';
 import { formatDate } from '$lib/utils/date';
-import { relativeYearsDe } from '$lib/relativeTime';
 import * as m from '$lib/paraglide/messages.js';
 
 type Person = { id: string; firstName?: string | null; lastName: string; displayName: string };
@@ -28,13 +27,11 @@ type Doc = {
 let {
 	doc,
 	isOut,
-	showOtherParty,
-	now = new Date()
+	showOtherParty
 }: {
 	doc: Doc;
 	isOut: boolean;
 	showOtherParty: boolean;
-	now?: Date;
 } = $props();
 
 const title = $derived(doc.title || doc.originalFilename);
@@ -45,9 +42,6 @@ const otherPartyName = $derived(
 			: (doc.sender?.displayName ?? '')
 		: ''
 );
-const relativeYearLabel = $derived(
-	doc.documentDate ? relativeYearsDe(new Date(doc.documentDate + 'T12:00:00'), now) : ''
-);
 const directionLabel = $derived(isOut ? m.row_direction_sent() : m.row_direction_received());
 const ariaLabel = $derived(
 	`${directionLabel}: ${title}${doc.documentDate ? `, ${formatDate(doc.documentDate)}` : ''}`
@@ -63,23 +57,18 @@ const ariaLabel = $derived(
 >
 	<ConversationThumbnail doc={doc} />
 
-	<div class="flex min-w-0 flex-1 flex-col gap-1">
-		<div class="flex items-baseline justify-between gap-3">
-			<div class="min-w-0 flex-1 truncate text-sm font-bold text-ink">
-				{title}
-			</div>
-			{#if relativeYearLabel}
-				<div class="shrink-0 text-xs text-ink-3">{relativeYearLabel}</div>
-			{/if}
+	<div class="flex min-w-0 flex-1 flex-col gap-1.5">
+		<div class="min-w-0 flex-1 truncate text-lg font-bold text-ink">
+			{title}
 		</div>
 
 		{#if doc.summary}
-			<div class="line-clamp-2 text-sm text-ink-2 italic">
+			<div class="line-clamp-2 text-base text-ink-2 italic">
 				&ldquo;{doc.summary}&rdquo;
 			</div>
 		{/if}
 
-		<div class="flex flex-wrap items-center gap-x-[6px] gap-y-1 text-xs text-ink-3">
+		<div class="flex flex-wrap items-center gap-x-[6px] gap-y-1 text-sm text-ink-3">
 			<span>{doc.documentDate ? formatDate(doc.documentDate) : '—'}</span>
 			{#if doc.location}
 				<span class="text-line">·</span>