fix(ui): add inner padding to strip components

Add px-3 to person bar, filter controls, and hint bar so inputs
don't sit flush against the container edge.

Refs: #179

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

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 py-[6px] text-xs text-ink"
+	class="flex items-center gap-[5px] border-b border-accent bg-accent-bg px-3 py-[6px] text-xs text-ink"
 >
 	<svg
 		xmlns="http://www.w3.org/2000/svg"