feat(core): new theme editor poc (#7810)

packages/common/env/src/global.ts

@@ -31,6 +31,7 @@ export const runtimeFlagsSchema = z.object({
   enableExperimentalFeature: z.boolean(),
   enableInfoModal: z.boolean(),
   enableOrganize: z.boolean(),
+  enableThemeEditor: z.boolean(),
 });
 
 export type RuntimeConfig = z.infer<typeof runtimeFlagsSchema>;