Add save progress UI and fix MMS errors

Show a progress bar during MP3 generation, update styles, and improve MMS error messaging.

client/static/app.js

@@ -5,10 +5,47 @@ const editBtn = document.getElementById("edit-btn");
 const deleteBtn = document.getElementById("delete-btn");
 const cancelBtn = document.getElementById("cancel-btn");
 const downloadLink = document.getElementById("download-link");
+const progressWrap = document.getElementById("save-progress");
+const progressBar = document.getElementById("save-progress-bar");
 
 let items = [];
 let editMode = false;
 const selectedIds = new Set();
+let progressTimer = null;
+
+function startProgress() {
+  let value = 0;
+  progressWrap.classList.remove("hidden");
+  progressBar.style.width = "0%";
+  progressBar.setAttribute("aria-valuenow", "0");
+
+  if (progressTimer) {
+    clearInterval(progressTimer);
+  }
+
+  progressTimer = setInterval(() => {
+    value = Math.min(value + Math.random() * 8 + 2, 90);
+    progressBar.style.width = `${value}%`;
+    progressBar.setAttribute("aria-valuenow", `${Math.round(value)}`);
+  }, 300);
+}
+
+function finishProgress(success = true) {
+  if (progressTimer) {
+    clearInterval(progressTimer);
+    progressTimer = null;
+  }
+
+  progressBar.style.width = "100%";
+  progressBar.setAttribute("aria-valuenow", "100");
+
+  const delay = success ? 400 : 1200;
+  setTimeout(() => {
+    progressBar.style.width = "0%";
+    progressBar.setAttribute("aria-valuenow", "0");
+    progressWrap.classList.add("hidden");
+  }, delay);
+}
 
 function setEditMode(isEdit) {
   editMode = isEdit;
@@ -69,6 +106,7 @@ async function handleSave() {
     return;
   }
 
+  startProgress();
   const res = await fetch("/api/tts", {
     method: "POST",
     headers: { "Content-Type": "application/json" },
@@ -78,12 +116,14 @@ async function handleSave() {
   if (!res.ok) {
     const err = await res.json().catch(() => ({}));
     alert(err.detail || "저장에 실패했습니다.");
+    finishProgress(false);
     return;
   }
 
   const created = await res.json();
   items.unshift(created);
   renderList();
+  finishProgress(true);
 }
 
 async function handleItemClick(item) {

client/static/styles.css

@@ -65,6 +65,21 @@ button.danger {
   color: #ffffff;
 }
 
+.progress-wrap {
+  width: 100%;
+  height: 10px;
+  background: #f1d9a6;
+  border-radius: 6px;
+  overflow: hidden;
+}
+
+.progress-bar {
+  height: 100%;
+  width: 0%;
+  background: #f5a623;
+  transition: width 0.2s ease;
+}
+
 .tts-list {
   list-style: none;
   padding: 0;

client/templates/index.html

@@ -12,6 +12,16 @@
         <div class="panel-header">입력 텍스트</div>
         <textarea id="text-input" rows="16" placeholder="텍스트를 입력하세요"></textarea>
         <button id="save-btn" class="primary">mp3 저장</button>
+        <div id="save-progress" class="progress-wrap hidden" aria-label="저장 진행률">
+          <div
+            id="save-progress-bar"
+            class="progress-bar"
+            role="progressbar"
+            aria-valuemin="0"
+            aria-valuemax="100"
+            aria-valuenow="0"
+          ></div>
+        </div>
       </section>
 
       <section class="panel right">

server/tts_service.py

@@ -32,6 +32,10 @@ def _get_mms():
 def _text_to_wav_mms(text: str, wav_path: str) -> None:
     try:
         import torch
+    except Exception as exc:
+        raise RuntimeError("MMS TTS 사용을 위해 torch/numpy가 정상 설치되어야 합니다.") from exc
+
+    try:
         import soundfile as sf
     except Exception as exc:
         raise RuntimeError("MMS TTS 사용을 위해 soundfile 설치가 필요합니다.") from exc