docs: fix CfgSettings/DataSourceItem to satisfy JsonObject in plan

docs/superpowers/plans/2026-08-14-llama-watch.md

@@ -254,12 +254,14 @@ Expected: FAIL — module `../src/lib/util` not found.
 - [ ] **Step 3: Implement `src/lib/util.ts`**
 
 ```ts
+import type { JsonObject } from "@elgato/utils";
+
 export const DEFAULT_BASE_URL = "http://localhost:9292";
 
-export interface CfgSettings {
+export type CfgSettings = {
   baseUrl?: string;
   apiKey?: string;
-}
+} & JsonObject;
 
 export interface LlamaSwapConfig {
   baseUrl: string;
@@ -1572,6 +1574,9 @@ interface DataSourceItem {
   label: string;
   value: string;
 }
+```
+
+Note: `DataSourceItem` must be a `type` alias, not an interface — interfaces without an index signature aren't assignable to `JsonObject`/`JsonValue`, which produces non-fatal TS diagnostics in `sendToPropertyInspector(payload: JsonValue)`. Define it as `type DataSourceItem = { label: string; value: string };` instead (type literals get implicit index signatures).
 
 export function registerDataSources(): void {
   streamDeck.ui.onSendToPlugin(async (ev) => {