fix(inventory): recover from a stuck loading spinner

The inventory stream subscription had no onError handler, so a transient
failure at startup (e.g. the encrypted DB not yet ready) went unhandled
and left loading=true forever — the spinner that only a restart cleared.

Handle stream errors: drop out of loading, surface an error state, and
offer a retry that re-opens the stream. Add a _LoadError view (i18n en/
es/ast/pt) and cover both the failure and the retry-recovers paths.

apps/app_seeds/lib/i18n/es.i18n.json

@@ -132,7 +132,9 @@
     "noMatches": "Ninguna semilla coincide con los filtros.",
     "clearFilters": "Quitar filtros",
     "uncategorized": "Sin categoría",
-    "needsReproductionFilter": "Por reproducir"
+    "needsReproductionFilter": "Por reproducir",
+    "loadError": "No se pudo abrir tu banco de semillas. Quizá estaba ocupado: inténtalo de nuevo.",
+    "retry": "Reintentar"
   },
   "draft": {
     "capture": "Capturar fotos",