diff --git a/README.md b/README.md
index a4365676..3a081da1 100644
--- a/README.md
+++ b/README.md
@@ -62,10 +62,9 @@
 
 | 人格体 | 角色 | 职责 |
 |--------|------|------|
-| **铸渊 Zhùyuān** | 代码守护者 | 代码审查、CI 巡检、模块协议执行、Issue 回复 |
+| **铸渊 Zhùyuān** | 代码守护者 | 代码审查、CI 巡检、模块协议执行、Issue 回复、对话协助、代码生成、开发体验（[Persona Studio](https://qinfendebingshuo.github.io/guanghulab/persona-studio/)） |
 | **冰朔 Bīng Shuò** | 系统创建者 | 系统架构设计、核心决策、广播发布 |
 | **霜砚 Shuāng Yàn** | 人格导师 | 人格调校、风格管理、联觉语言系统 |
-| **铸渊 Zhùyuān** | 代码守护者 | 代码审查、CI 巡检、模块协议执行、Issue 回复、对话协助、代码生成、开发体验（[Persona Studio](https://qinfendebingshuo.github.io/guanghulab/persona-studio/)） |
 
 ---
 
diff --git a/persona-studio/frontend/chat.html b/persona-studio/frontend/chat.html
index e5d81689..38a10165 100644
--- a/persona-studio/frontend/chat.html
+++ b/persona-studio/frontend/chat.html
@@ -82,11 +82,11 @@
         <div class="input-toolbar">
           <label class="toolbar-btn" title="上传图片" for="imageUpload">
             🖼️
-            <input type="file" id="imageUpload" accept="image/*" style="display:none" onchange="handleFileSelect(event, 'image')">
+            <input type="file" id="imageUpload" accept="image/*" style="display:none" onchange="handleFileSelect(event, 'image')" aria-label="上传图片">
           </label>
           <label class="toolbar-btn" title="上传文件" for="fileUpload">
             📎
-            <input type="file" id="fileUpload" style="display:none" onchange="handleFileSelect(event, 'file')">
+            <input type="file" id="fileUpload" style="display:none" onchange="handleFileSelect(event, 'file')" aria-label="上传文件">
           </label>
           <div id="uploadPreview" class="upload-preview" style="display:none;"></div>
         </div>
diff --git a/persona-studio/frontend/chat.js b/persona-studio/frontend/chat.js
index a3c0f409..e3a50cce 100644
--- a/persona-studio/frontend/chat.js
+++ b/persona-studio/frontend/chat.js
@@ -22,6 +22,7 @@ const API_BASE = (function () {
 let conversationHistory = [];
 let buildReady = false;
 let pendingFile = null; // { name, type, dataUrl }
+const MAX_FILE_SIZE = 5 * 1024 * 1024; // 5MB
 const isGuest = (DEV_ID === 'GUEST');
 const isDeveloper = (DEV_ID && DEV_ID !== 'GUEST' && /^EXP-\d{3,}$/.test(DEV_ID));
 
@@ -48,7 +49,7 @@ function setActiveSessionId(id) {
 }
 
 function createNewSession() {
-  var id = Date.now().toString(36) + Math.random().toString(36).slice(2, 6);
+  var id = Date.now().toString(36) + Math.random().toString(36).slice(2, 10);
   var session = {
     id: id,
     title: '新对话',
@@ -299,8 +300,7 @@ function handleFileSelect(event, type) {
   var file = event.target.files[0];
   if (!file) return;
 
-  var maxSize = 5 * 1024 * 1024; // 5MB
-  if (file.size > maxSize) {
+  if (file.size > MAX_FILE_SIZE) {
     appendMessage('system', '⚠️ 文件过大，最大支持 5MB');
     event.target.value = '';
     return;
@@ -318,11 +318,7 @@ function handleFileSelect(event, type) {
     showUploadPreview();
   };
 
-  if (type === 'image') {
-    reader.readAsDataURL(file);
-  } else {
-    reader.readAsDataURL(file);
-  }
+  reader.readAsDataURL(file);
 
   event.target.value = '';
 }