Dedupe and organize skills/sources (#8731)

ui/goose2/src/shared/i18n/locales/en/skills.json

@@ -9,7 +9,8 @@
     "instructionsPlaceholder": "Markdown instructions the agent will follow...",
     "name": "Name",
     "namePlaceholder": "my-skill-name",
-    "nameValidation": "Must be kebab-case (e.g. code-review)",
+    "nameValidation": "Use 1–64 lowercase letters, numbers, or hyphens. Names cannot start or end with a hyphen.",
+    "pathOnDisk": "Path on disk",
     "newTitle": "New Skill",
     "saving": "Saving..."
   },

ui/goose2/src/shared/i18n/locales/es/skills.json

@@ -9,7 +9,8 @@
     "instructionsPlaceholder": "Instrucciones en Markdown que seguirá el agente...",
     "name": "Nombre",
     "namePlaceholder": "mi-skill",
-    "nameValidation": "Debe estar en kebab-case (p. ej. code-review)",
+    "nameValidation": "Usa de 1 a 64 letras minúsculas, números o guiones. El nombre no puede empezar ni terminar con un guion.",
+    "pathOnDisk": "Ruta en disco",
     "newTitle": "Nueva skill",
     "saving": "Guardando..."
   },