feat: add fusion for multi-run sessions

Adds Run fusion for multi-run-like sessions
Combines sibling outputs into a new fusion session
Adds configurable Fusion prompts in Magic Prompts settings

packages/ui/src/lib/i18n/messages/es.ts

@@ -181,6 +181,16 @@ export const dict: Record<I18nKey, string> = {
   "multirun.modelMultiSelect.validation.minOnly": "Selecciona al menos {min} modelos.",
   "multirun.modelMultiSelect.validation.minToMax": "Selecciona entre {min} y {max} modelos.",
   "multirun.agentSelector.placeholder": "Selecciona un agente",
+  "multirun.fusion.title": "Ejecutar fusion",
+  "multirun.fusion.description": "Combina los resultados seleccionados del multi-run en una respuesta más sólida.",
+  "multirun.fusion.provider.placeholder": "Proveedor",
+  "multirun.fusion.model.placeholder": "Modelo",
+  "multirun.fusion.sources.label": "Fuentes ({count})",
+  "multirun.fusion.actions.cancel": "Cancelar",
+  "multirun.fusion.actions.start": "Iniciar fusion",
+  "multirun.fusion.actions.starting": "Iniciando...",
+  "multirun.fusion.toast.noOutputs": "No se encontraron respuestas del asistente para fusionar.",
+  "multirun.fusion.toast.failed": "No se pudo iniciar fusion.",
   "sessions.sidebar.header.actions.searchSessions": "Buscar sesiones",
   "sessions.sidebar.header.actions.exitSelection": "Salir de selección",
   "sessions.sidebar.header.actions.selectSessions": "Seleccionar sesiones",
@@ -243,6 +253,7 @@ export const dict: Record<I18nKey, string> = {
   "sessions.sidebar.session.menu.copyLink": "Copiar enlace",
   "sessions.sidebar.session.menu.unshare": "Dejar de compartir",
   "sessions.sidebar.session.menu.exportMarkdown": "Exportar Markdown",
+  "sessions.sidebar.session.menu.runFusion": "Ejecutar fusion",
   "sessions.sidebar.session.menu.openInSidePanel": "Abrir en panel lateral",
   "sessions.sidebar.session.menu.betaBadge": "beta",
   "sessions.sidebar.session.menu.label": "Menú de sesión",