feat: fix typescript errors

frontend/src/components/EpisodePlayer.tsx

@@ -14,7 +14,6 @@ export default function EpisodePlayer() {
   const [audioUrl, setAudioUrl] = useState<string | null>(null);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
-  const [isPlaying, setIsPlaying] = useState(false);
 
   useEffect(() => {
     fetchEpisodes();

scripts/fetch_and_generate.ts

@@ -1,7 +1,7 @@
 import Parser from "rss-parser";
 import {
   openAI_ClassifyFeed,
-  openAI_GeneratePodcastContent 
+  openAI_GeneratePodcastContent,
 } from "../services/llm";
 import { generateTTS } from "../services/tts";
 import { saveEpisode, markAsProcessed } from "../services/database";
@@ -52,7 +52,7 @@ async function main() {
     const yesterday = new Date();
     yesterday.setDate(yesterday.getDate() - 1);
 
-    const yesterdayItems = feed.items.filter(item => {
+    const yesterdayItems = feed.items.filter((item) => {
       const pub = new Date(item.pubDate || "");
       return (
         pub.getFullYear() === yesterday.getFullYear() &&
@@ -68,18 +68,31 @@ async function main() {
 
     // ポッドキャスト原稿生成
     console.log(`ポッドキャスト原稿生成開始: ${feedTitle}`);
-    const podcastContent = await openAI_GeneratePodcastContent(feedTitle, yesterdayItems);
+    const validItems = yesterdayItems.filter((item): item is FeedItem => {
+      return !!item.title && !!item.link;
+    });
+    const podcastContent = await openAI_GeneratePodcastContent(
+      feedTitle,
+      validItems,
+    );
 
     // トピックごとの統合音声生成
     const feedUrlHash = crypto.createHash("md5").update(url).digest("hex");
-    const categoryHash = crypto.createHash("md5").update(category).digest("hex");
-    const uniqueFilename = `${feedUrlHash}-${categoryHash}.mp3`;
+    const categoryHash = crypto
+      .createHash("md5")
+      .update(category)
+      .digest("hex");
+    const uniqueFilename = `${feedUrlHash}-${categoryHash}.wav`;
 
     const audioFilePath = await generateTTS(uniqueFilename, podcastContent);
     console.log(`音声ファイル生成完了: ${audioFilePath}`);
 
     // エピソードとして保存（各フィードにつき1つの統合エピソード）
     const firstItem = yesterdayItems[0];
+    if (!firstItem) {
+      console.warn("アイテムが空です");
+      continue;
+    }
     const pub = new Date(firstItem.pubDate || "");
 
     await saveEpisode({