fix: prevent stale comment drafts from being restored

web/src/components/MemoEditor/services/cacheService.ts

-import { debounce } from "lodash-es";
-
 export const CACHE_DEBOUNCE_DELAY = 500;
 
+const pendingSaves = new Map<string, ReturnType<typeof window.setTimeout>>();
+
 export const cacheService = {
   key: (username: string, cacheKey?: string): string => {
     return `${username}-${cacheKey || ""}`;
   },
 
-  save: debounce((key: string, content: string) => {
+  save: (key: string, content: string) => {
+    const pendingSave = pendingSaves.get(key);
+    if (pendingSave) {
+      window.clearTimeout(pendingSave);
+    }
+
+    const timeoutId = window.setTimeout(() => {
+      pendingSaves.delete(key);
+
       if (content.trim()) {
         localStorage.setItem(key, content);
       } else {
         localStorage.removeItem(key);
       }
-  }, CACHE_DEBOUNCE_DELAY),
+    }, CACHE_DEBOUNCE_DELAY);
+
+    pendingSaves.set(key, timeoutId);
+  },
 
   load(key: string): string {
     return localStorage.getItem(key) || "";
   },
 
   clear(key: string): void {
+    const pendingSave = pendingSaves.get(key);
+    if (pendingSave) {
+      window.clearTimeout(pendingSave);
+      pendingSaves.delete(key);
+    }
+
     localStorage.removeItem(key);
   },
+
+  clearAll(): void {
+    for (const timeoutId of pendingSaves.values()) {
+      window.clearTimeout(timeoutId);
+    }
+    pendingSaves.clear();
+  },
 };