merge(feat/person-birth-death-years): resolve conflicts with main, bump migration to V6

Resolves merge conflicts with main (feat/person-notes merged first).
Combines both features: birth/death years and notes field on person detail.
Renames migration V5__add_birth_death_years to V6 to avoid Flyway conflict.

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

frontend/messages/es.json

@@ -111,6 +111,8 @@
 	"person_btn_merge": "Fusionar",
 	"person_btn_merge_confirm": "Sí, fusionar",
 	"person_merge_warning": "Atención: Esta acción no se puede deshacer.",
+	"person_label_notes": "Notas",
+	"person_placeholder_notes": "Notas biográficas, observaciones…",
 	"person_label_birth_year": "Año de nacimiento",
 	"person_label_death_year": "Año de fallecimiento",
 	"person_placeholder_year": "p.ej. 1923",
@@ -180,5 +182,6 @@
 	"comp_taginput_placeholder_create": "Añadir etiquetas...",
 	"comp_taginput_placeholder_filter": "Filtrar por etiquetas...",
 	"comp_taginput_remove": "Eliminar etiqueta",
-	"comp_taginput_create_hint": "Pulse Enter para crear etiqueta."
+	"comp_taginput_create_hint": "Pulse Enter para crear etiqueta.",
+	"person_btn_conversations": "Ver conversaciones"
 }