Clarify random book actions

static/app.js

@@ -2529,17 +2529,18 @@ function typewriter(el, text, speed = 60) {
 
 async function randomBook() {
   try {
+    showToast("正在随机下载书籍...");
     const rec = await API.getRandom(STATE.repo);
     const link = rec ? (rec.Link || rec.link || "") : "";
     if (link) {
       const filename = (rec.File || "file") + (rec.Extension ? '.' + rec.Extension : '');
       downloadFile(filename, link, { skipCheck: true });
     } else {
-      showToast("暂无可用记录");
+      showToast("暂无可下载书籍");
     }
   } catch (e) {
     console.error(e);
-    showToast("获取失败");
+    showToast("随机下载失败");
   }
 }
 
@@ -2557,18 +2558,18 @@ async function randomTxt() {
   const requestId = ++randomReaderRequestId;
   const returnUrl = location.href;
   try {
-    showToast("正在随机打开文章...");
+    showToast("正在随机打开书籍...");
     const url = STATE.repo ? `/api/random-reader?repo=${encodeURIComponent(STATE.repo)}` : "/api/random-reader";
     const resp = await fetch(url);
     if (!resp.ok) throw new Error("HTTP " + resp.status);
     const rec = await resp.json();
     if (requestId !== randomReaderRequestId || location.href !== returnUrl) return;
     if (!openReaderRecord(rec, returnUrl)) {
-      showToast("暂无可读文章");
+      showToast("暂无可读书籍");
     }
   } catch (e) {
     console.error(e);
-    showToast("获取失败");
+    showToast("随机打开失败");
   }
 }
 let toastTimer;
@@ -3150,7 +3151,7 @@ async function init() {
   DOM.overlay.addEventListener("click", () => { STATE.leftSidebarOpen = false; STATE.rightSidebarOpen = false; updateSidebarVisibility(); syncStateToURL(true); });
   DOM.randomBookBtn.addEventListener('click', randomBook);
   if (DOM.randomTxtBtn) DOM.randomTxtBtn.addEventListener('click', randomTxt);
-  DOM.emptyRandomBtn.addEventListener('click', randomBook);
+  DOM.emptyRandomBtn.addEventListener('click', randomTxt);
   let sizeTimer;
   const sizeInputToBytes = (input, unitSelect) => {
     var val = parseFloat(input.value);

static/index.html

@@ -240,16 +240,16 @@
 
 <footer id="footer" class="footer">
   <div id="hitokoto" class="hitokoto"></div>
-  <button id="random-txt-btn" class="random-txt-btn" title="随机来一篇">
+  <button id="random-book-btn" class="random-txt-btn" title="随机下本书">
     <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
       <path d="M14 2H6a2 2 0 00-2 2v16a2 2 0 002 2h12a2 2 0 002-2V8z"/>
       <polyline points="14 2 14 8 20 8"/>
       <line x1="8" y1="13" x2="16" y2="13"/>
       <line x1="8" y1="17" x2="14" y2="17"/>
     </svg>
-    随机来一篇
+    随机下本书
   </button>
-  <button id="random-book-btn" class="random-book-btn" title="随机来本书">
+  <button id="random-txt-btn" class="random-book-btn" title="随机来本书">
     <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
       <path d="M2 3h6a4 4 0 014 4v14a3 3 0 00-3-3H2z"/>
       <path d="M22 3h-6a4 4 0 00-4 4v14a3 3 0 013-3h7z"/>