fix(ui): unify Briefwechsel search bar with document search card style

Wrap person bar + filter controls in a card matching the document
search page (rounded-sm border p-6 shadow-sm). Switch PersonTypeahead
to default mode with matching label/input overrides. Bump date inputs
and sort button to text-sm py-2.5. Filter row uses border-t separator
like the document search advanced section.

Refs: #179

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

frontend/src/routes/briefwechsel/+page.svelte

@@ -99,37 +99,39 @@ function selectPerson(id: string) {
 		<CorrespondenzHero onSelectPerson={selectPerson} recentPersons={recentPersons} />
 	</div>
 {:else}
-	<!-- Results state: strips + content -->
+	<!-- Results state: card + content -->
 	<div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8">
-		<CorrespondenzPersonBar
-			bind:senderId={senderId}
-			bind:receiverId={receiverId}
-			initialSenderName={data.initialValues.senderName}
-			initialReceiverName={data.initialValues.receiverName}
-			onapplyFilters={applyFilters}
-			onswapPersons={swapPersons}
-		/>
-
-		<CorrespondenzFilterControls
-			senderId={senderId}
-			bind:fromDate={fromDate}
-			bind:toDate={toDate}
-			bind:sortDir={sortDir}
-			documentCount={data.documents.length}
-			onapplyFilters={applyFilters}
-			ontoggleSort={toggleSort}
-		/>
-
-		{#if isSinglePerson}
-			<SinglePersonHintBar
-				senderName={senderName}
-				fromDate={fromDate || undefined}
-				toDate={toDate || undefined}
-				sortDir={sortDir}
+		<div class="mb-8 rounded-sm border border-line bg-surface p-6 shadow-sm">
+			<CorrespondenzPersonBar
+				bind:senderId={senderId}
+				bind:receiverId={receiverId}
+				initialSenderName={data.initialValues.senderName}
+				initialReceiverName={data.initialValues.receiverName}
+				onapplyFilters={applyFilters}
+				onswapPersons={swapPersons}
 			/>
-		{/if}
 
-		<div class="py-4">
+			<CorrespondenzFilterControls
+				senderId={senderId}
+				bind:fromDate={fromDate}
+				bind:toDate={toDate}
+				bind:sortDir={sortDir}
+				documentCount={data.documents.length}
+				onapplyFilters={applyFilters}
+				ontoggleSort={toggleSort}
+			/>
+
+			{#if isSinglePerson}
+				<SinglePersonHintBar
+					senderName={senderName}
+					fromDate={fromDate || undefined}
+					toDate={toDate || undefined}
+					sortDir={sortDir}
+				/>
+			{/if}
+		</div>
+
+		<div>
 			{#if data.documents.length === 0}
 				<div
 					class="flex flex-col items-center justify-center rounded-sm border border-line bg-muted py-24 text-center shadow-sm"

frontend/src/routes/briefwechsel/CorrespondenzFilterControls.svelte

@@ -28,13 +28,13 @@ let isActive = $derived(!!(fromDate || toDate || sortDir !== 'DESC'));
 
 <div
 	data-testid="conv-filter-controls"
-	class="flex items-center gap-[10px] border-b border-line bg-muted px-3 py-[5px] transition-opacity"
+	class="mt-6 flex items-center gap-4 border-t border-line-2 pt-6 transition-opacity"
 	class:opacity-40={!senderId}
 	class:pointer-events-none={!senderId}
 	aria-disabled={!senderId}
 >
 	<!-- Period label -->
-	<span class="hidden text-xs font-bold tracking-wide text-ink-3 uppercase sm:block">
+	<span class="text-xs font-bold tracking-widest text-ink-2 uppercase">
 		{m.conv_strip_period()}
 	</span>
 
@@ -43,23 +43,23 @@ let isActive = $derived(!!(fromDate || toDate || sortDir !== 'DESC'));
 		bind:value={fromDate}
 		onchange={() => onapplyFilters()}
 		placeholder={m.conv_strip_from_placeholder()}
-		class="h-8 w-[100px] rounded border bg-surface px-2 text-xs text-ink focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring {fromDate ? 'border-primary' : 'border-line'}"
+		class="w-[120px] border-line py-2.5 text-sm text-ink shadow-sm focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring {fromDate ? 'border-primary' : 'border-line'}"
 	/>
 
-	<span class="text-xs text-ink-3">–</span>
+	<span class="text-sm text-ink-3">–</span>
 
 	<!-- To date -->
 	<DateInput
 		bind:value={toDate}
 		onchange={() => onapplyFilters()}
 		placeholder={m.conv_strip_to_placeholder()}
-		class="h-8 w-[100px] rounded border bg-surface px-2 text-xs text-ink focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring {toDate ? 'border-primary' : 'border-line'}"
+		class="w-[120px] border-line py-2.5 text-sm text-ink shadow-sm focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring {toDate ? 'border-primary' : 'border-line'}"
 	/>
 
 	<!-- Document count -->
 	<span
 		data-testid="conv-strip-count"
-		class="ml-auto text-xs font-bold"
+		class="ml-auto text-sm font-bold"
 		class:text-primary={hasDateFilter}
 		class:text-ink-3={!hasDateFilter}
 	>
@@ -73,18 +73,18 @@ let isActive = $derived(!!(fromDate || toDate || sortDir !== 'DESC'));
 		aria-label="Sortierung umkehren"
 		aria-pressed={sortDir === 'ASC'}
 		onclick={ontoggleSort}
-		class="flex h-8 min-h-[44px] items-center gap-1 rounded border px-3 text-xs font-bold"
+		class="flex items-center gap-2 border px-4 py-2.5 text-sm font-bold tracking-wide uppercase transition hover:bg-muted hover:text-ink"
 		class:border-primary={isActive}
 		class:text-primary={isActive}
 		class:border-line={!isActive}
-		class:text-ink-3={!isActive}
+		class:text-ink-2={!isActive}
 	>
 		{#if sortDir === 'ASC'}
 			{m.conv_strip_sort_oldest()}
 			<svg
 				xmlns="http://www.w3.org/2000/svg"
-				width="10"
-				height="10"
+				width="12"
+				height="12"
 				viewBox="0 0 24 24"
 				fill="none"
 				stroke="currentColor"
@@ -99,8 +99,8 @@ let isActive = $derived(!!(fromDate || toDate || sortDir !== 'DESC'));
 			{m.conv_strip_sort_newest()}
 			<svg
 				xmlns="http://www.w3.org/2000/svg"
-				width="10"
-				height="10"
+				width="12"
+				height="12"
 				viewBox="0 0 24 24"
 				fill="none"
 				stroke="currentColor"

frontend/src/routes/briefwechsel/CorrespondenzPersonBar.svelte

@@ -53,18 +53,16 @@ function handleSuggestionSelect(id: string) {
 }
 </script>
 
-<div
-	data-testid="conv-person-bar"
-	class="flex items-end gap-[9px] border-b border-line bg-surface px-3 py-[9px] [&_input]:h-12"
->
+<div data-testid="conv-person-bar" class="flex items-end gap-4">
 	<!-- Person A -->
-	<div class="min-w-0 flex-1">
+	<div
+		class="min-w-0 flex-1 [&_input]:border-line [&_input]:py-2.5 [&_label]:mb-2 [&_label]:text-xs [&_label]:font-bold [&_label]:tracking-widest [&_label]:text-ink-2 [&_label]:uppercase"
+	>
 		<PersonTypeahead
 			name="senderId"
 			label="Person"
 			bind:value={senderId}
 			initialName={initialSenderName}
-			compact={true}
 			restrictToCorrespondentsOf={receiverId || undefined}
 			onchange={() => onapplyFilters()}
 		/>
@@ -76,7 +74,7 @@ function handleSuggestionSelect(id: string) {
 		type="button"
 		aria-label="Personen tauschen"
 		onclick={onswapPersons}
-		class="flex h-9 w-9 shrink-0 items-center justify-center rounded border border-line bg-surface text-ink-3 transition-colors hover:border-primary hover:text-primary"
+		class="mb-[3px] flex items-center justify-center rounded border border-line bg-muted px-3 py-2.5 text-ink-3 transition-colors hover:border-primary hover:text-primary"
 		class:opacity-0={!swapVisible}
 		class:pointer-events-none={!swapVisible}
 		tabindex={swapVisible ? 0 : -1}
@@ -100,7 +98,7 @@ function handleSuggestionSelect(id: string) {
 
 	<!-- Korrespondent field -->
 	<div
-		class="relative min-w-0 flex-1"
+		class="relative min-w-0 flex-1 [&_input]:border-line [&_input]:py-2.5 [&_label]:mb-2 [&_label]:text-xs [&_label]:font-bold [&_label]:tracking-widest [&_label]:text-ink-2 [&_label]:uppercase"
 		class:[&_input]:border-dashed={!receiverId}
 		class:[&_input]:border-solid={!!receiverId}
 		class:[&_input]:bg-canvas={!receiverId}
@@ -110,7 +108,6 @@ function handleSuggestionSelect(id: string) {
 			label={receiverId ? 'Korrespondent' : 'Korrespondent — optional'}
 			bind:value={receiverId}
 			initialName={initialReceiverName}
-			compact={true}
 			placeholder="Alle Korrespondenten"
 			restrictToCorrespondentsOf={senderId || undefined}
 			onchange={() => {

frontend/src/routes/briefwechsel/SinglePersonHintBar.svelte

@@ -19,7 +19,7 @@ let toYear = $derived(toDate ? toDate.substring(0, 4) : '');
 </script>
 
 <div
-	class="flex items-center gap-[5px] border-b border-accent bg-accent-bg px-3 py-[6px] text-xs text-ink"
+	class="mt-4 flex items-center gap-1.5 rounded-sm border border-accent bg-accent-bg px-4 py-2.5 text-sm text-ink"
 >
 	<svg
 		xmlns="http://www.w3.org/2000/svg"