Allow syntactic sugar in config.

src/types.ts

@@ -103,6 +103,8 @@ const customActionSchema = z.object({
   action: z.literal('fire-dom-event'),
 })
 export const frigateCardCustomActionSchema = customActionSchema.merge(z.object({
+  // Syntactic sugar to avoid 'fire-dom-event' as part of an external API.
+  action: z.literal('fire-dom-event').or(z.literal('custom:frigate-card-action').transform(() => 'fire-dom-event')),
   frigate_card_action: z.string(),
 }))
 export type FrigateCardCustomAction = z.infer<typeof frigateCardCustomActionSchema>;