feat(dashboard): add stats footnote and min-h touch target to DashboardRecentDocuments

Adds stats?: StatsDTO | null prop; renders a quiet footnote showing total
document and person counts. Guards on stats?.totalDocuments != null so
zero is shown but the footnote is absent when stats fails. Adds
min-h-[44px] to doc rows for WCAG 2.5.5 touch target compliance.
Adds dashboard_stats_documents/persons i18n keys in de/en/es.

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

frontend/messages/de.json

@@ -375,6 +375,8 @@
 	"dashboard_needs_metadata_heading": "Metadaten fehlen",
 	"dashboard_needs_metadata_show_all": "Alle anzeigen",
 	"dashboard_recent_heading": "Zuletzt aktiv",
+	"dashboard_stats_documents": "Dokumente",
+	"dashboard_stats_persons": "Personen",
 	"dashboard_resume_label": "Zuletzt geöffnet:",
 	"dashboard_resume_fallback": "Unbekanntes Dokument",
 	"doc_status_placeholder": "Platzhalter",

frontend/messages/en.json

@@ -375,6 +375,8 @@
 	"dashboard_needs_metadata_heading": "Missing Metadata",
 	"dashboard_needs_metadata_show_all": "Show all",
 	"dashboard_recent_heading": "Recent Activity",
+	"dashboard_stats_documents": "Documents",
+	"dashboard_stats_persons": "Persons",
 	"dashboard_resume_label": "Last opened:",
 	"dashboard_resume_fallback": "Unknown document",
 	"doc_status_placeholder": "Placeholder",

frontend/messages/es.json

@@ -375,6 +375,8 @@
 	"dashboard_needs_metadata_heading": "Metadatos incompletos",
 	"dashboard_needs_metadata_show_all": "Ver todos",
 	"dashboard_recent_heading": "Actividad reciente",
+	"dashboard_stats_documents": "Documentos",
+	"dashboard_stats_persons": "Personas",
 	"dashboard_resume_label": "Último abierto:",
 	"dashboard_resume_fallback": "Documento desconocido",
 	"doc_status_placeholder": "Marcador",