fix(types,testing): tighten action context typing and update tests for stricter TypeScript checks

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartstate',
-  version: '2.3.0',
+  version: '2.3.1',
   description: 'A TypeScript-first reactive state management library with middleware, computed state, batching, persistence, and Web Component Context Protocol support.'
 }

ts/smartstate.classes.stateaction.ts

@@ -10,7 +10,7 @@ export interface IActionContext<TStateType> {
 }
 
 export interface IActionDef<TStateType, TActionPayloadType> {
-  (stateArg: StatePart<any, TStateType>, actionPayload: TActionPayloadType, context?: IActionContext<TStateType>): Promise<TStateType>;
+  (stateArg: StatePart<any, TStateType>, actionPayload: TActionPayloadType, context: IActionContext<TStateType>): Promise<TStateType>;
 }
 
 /**