fix: 所有按钮添加 type=button，防止表单误提交

index.html

@@ -38,7 +38,7 @@
           <svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm-2 14.5v-9l6 4.5-6 4.5z"/></svg>
         </button>
       </div>
-      <button class="icon-btn" id="openSettings" title="设置">
+      <button type="button" class="icon-btn" id="openSettings" title="设置">
         <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
           <circle cx="12" cy="12" r="3"/>
           <path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83-2.83l.06-.06A1.65 1.65 0 0 0 4.68 15a1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 2.83-2.83l.06.06A1.65 1.65 0 0 0 9 4.68a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 2.83l-.06.06A1.65 1.65 0 0 0 19.4 9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z"/>
@@ -50,7 +50,7 @@
   <!-- API Key Alert -->
   <div class="alert-banner" id="apiKeyAlert" style="display:none">
     <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"/><line x1="12" y1="8" x2="12" y2="12"/><line x1="12" y1="16" x2="12.01" y2="16"/></svg>
-    <span>未配置 API Key，请先在 <button class="link-btn" id="alertSettingsBtn">设置</button> 中填写。</span>
+    <span>未配置 API Key，请先在 <button type="button" class="link-btn" id="alertSettingsBtn">设置</button> 中填写。</span>
   </div>
 
   <main>
@@ -245,7 +245,7 @@
   <div class="modal">
     <div class="modal-header">
       <h2>设置</h2>
-      <button class="icon-btn" id="closeSettings">
+      <button type="button" class="icon-btn" id="closeSettings">
         <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
           <line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/>
         </svg>
@@ -271,8 +271,8 @@
       </div>
     </div>
     <div class="modal-footer">
-      <button class="btn-secondary" id="cancelSettings">取消</button>
+      <button type="button" class="btn-secondary" id="cancelSettings">取消</button>
-      <button class="btn-primary" id="saveSettingsBtn">保存</button>
+      <button type="button" class="btn-primary" id="saveSettingsBtn">保存</button>
     </div>
   </div>
 </div>