Convert search query and content to lowercase

src/search.tsx

@@ -47,7 +47,7 @@ export default function Search(props: {
             className="m-1 p-1 w-full border"
             type="text"
             onInput={async (event: any) => {
-              const query = event.target.value.trim();
+              const query = event.target.value.trim().toLowerCase();
               if (!query) {
                 setSearchResult([]);
                 return;
@@ -81,7 +81,7 @@ export default function Search(props: {
                 if (now !== searchingNow) setSearchingNow(now);
 
                 const value: ChatStore = await db.get("chatgpt-api-web", key);
-                const content = value.contents_for_index.join(" ");
+                const content = value.contents_for_index.join(" ").toLowerCase();
                 if (content.includes(query)) {
                   const beginIndex: number = content.indexOf(query);
                   const preview = content.slice(