chore: add no data tip

web/src/pages/Explore.tsx

@@ -78,7 +78,8 @@ const Explore = () => {
         </div>
         <Only when={!loadingState.isLoading}>
           <main className="memos-wrapper">
-            {state.memos.map((memo) => {
+            {state.memos.length > 0 ? (
+              state.memos.map((memo) => {
                 const createdAtStr = dayjs(memo.createdTs).locale(locale).format("YYYY/MM/DD HH:mm:ss");
                 return (
                   <div className="memo-container" key={memo.id}>
@@ -93,7 +94,10 @@ const Explore = () => {
                     <MemoResources memo={memo} />
                   </div>
                 );
-            })}
+              })
+            ) : (
+              <p className="w-full text-center mt-12 text-gray-600">{t("message.no-memos")}</p>
+            )}
           </main>
         </Only>
       </div>