chore: clean up state.ts, remove unused recipe/preview state

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/state.ts

@@ -1,43 +1,23 @@
-import type { Recipe, PreviewResult, HistoryItem, SystemStatus, DoctorReport } from "./types";
+import type { DoctorReport } from "./types";
 
 export interface AppState {
-  recipes: Recipe[];
-  history: HistoryItem[];
-  status: SystemStatus | null;
   doctor: DoctorReport | null;
-  lastPreview: PreviewResult | null;
   message: string;
 }
 
 export const initialState: AppState = {
-  recipes: [],
-  history: [],
-  status: null,
   doctor: null,
-  lastPreview: null,
   message: "",
 };
 
 export type Action =
-  | { type: "setRecipes"; recipes: Recipe[] }
-  | { type: "setHistory"; history: HistoryItem[] }
-  | { type: "setStatus"; status: SystemStatus }
   | { type: "setDoctor"; doctor: DoctorReport }
-  | { type: "setPreview"; preview: PreviewResult }
   | { type: "setMessage"; message: string };
 
 export function reducer(state: AppState, action: Action): AppState {
   switch (action.type) {
-    case "setRecipes":
-      return { ...state, recipes: action.recipes };
-    case "setHistory":
-      return { ...state, history: action.history };
-    case "setStatus":
-      return { ...state, status: action.status };
     case "setDoctor":
       return { ...state, doctor: action.doctor };
-    case "setPreview":
-      return { ...state, lastPreview: action.preview };
     case "setMessage":
       return { ...state, message: action.message };
     default: