chore：智能用户和回答都字号都25，不加粗

pages_tool/ai-chat/ai-chat-message.vue

@@ -2967,7 +2967,7 @@ _handleStreamError(msg) {
         //   之前行内代码是粉色(#d63384)、删除线是灰色(#999), 回答里颜色太杂。
         t = t
           .replace(/`([^`]+)`/g, '<code style="background:#f2f3f5;padding:2rpx 10rpx;border-radius:6rpx;font-size:24rpx;font-family:monospace;color:' + TEXT + ';">$1</code>')
-          .replace(/\*\*(.+?)\*\*/g, '<strong style="font-weight:700;color:' + TEXT + ';">$1</strong>')
+          .replace(/\*\*(.+?)\*\*/g, '<span style="color:' + TEXT + ';">$1</span>')
           .replace(/\*(.+?)\*/g, '<em style="font-style:italic;color:' + TEXT + ';">$1</em>')
           .replace(/~~(.+?)~~/g, '<del style="text-decoration:line-through;color:' + TEXT + ';">$1</del>')
 
@@ -3018,7 +3018,7 @@ _handleStreamError(msg) {
       const flushTable = () => {
         if (!inTable || tableRows.length === 0) return
         const thead = tableRows[0].map(c =>
-          `<th style="padding:8rpx 12rpx;border:1rpx solid #eaecef;font-weight:600;background:#f6f8fa;text-align:left;font-size:24rpx;color:${TEXT};">${parseInline(c)}</th>`
+          `<th style="padding:8rpx 12rpx;border:1rpx solid #eaecef;font-weight:400;background:#f6f8fa;text-align:left;font-size:24rpx;color:${TEXT};">${parseInline(c)}</th>`
         ).join('')
         const tbody = tableRows.slice(1).map(row =>
           '<tr>' + row.map(c =>
@@ -3066,7 +3066,7 @@ _handleStreamError(msg) {
           flushBuf(); out.push(closeList())
           const lv = hMatch[1].length
           const size = ['', '36rpx', '32rpx', '30rpx', '28rpx', '26rpx', '24rpx'][lv]
-          const wgt = ['', '700', '700', '600', '600', '500', '500'][lv]
+          const wgt = ['', '400', '400', '400', '400', '400', '400'][lv]
           const mg = COMPACT ? ['', '14rpx 0 7rpx', '12rpx 0 6rpx', '10rpx 0 5rpx', '8rpx 0 5rpx', '7rpx 0 3rpx', '6rpx 0 3rpx'][lv] : ['', '20rpx 0 10rpx', '16rpx 0 8rpx', '14rpx 0 6rpx', '12rpx 0 6rpx', '10rpx 0 4rpx', '8rpx 0 4rpx'][lv]
           out.push(`<h${lv} style="font-size:${size};font-weight:${wgt};margin:${mg};line-height:1.35;color:${TEXT};">${parseInline(hMatch[2])}</h${lv}>`)
           continue
@@ -4869,7 +4869,7 @@ _handleStreamError(msg) {
               color: #1a1a1a;
               
               strong {
-                font-weight: 600;
+                font-weight: 400;
                 color: #1a1a1a;
               }
               
@@ -5436,7 +5436,7 @@ _handleStreamError(msg) {
             max-width: 100%;
 
             .message-text {
-              font-size: 20rpx !important; // 还原为用户消息原字号
+              font-size: 25rpx !important; // 还原为用户消息原字号
             }
 
             &::before {
@@ -5520,10 +5520,17 @@ _handleStreamError(msg) {
             }
           }
 
+          // AI 回答文字字号统一为 25rpx
+          .message-text,
+          .ai-message-text {
+            font-size: 25rpx !important;
+            line-height: 1.7;
+          }
+
           // 微信端 AI 富文本(豆包风格)容器: 行高/字号/字色统一兜底
           .ai-message-rich {
             display: block;
-            font-size: 30rpx;
+            font-size: 25rpx;
             line-height: 1.75;
             color: #1a1a1a;
             letter-spacing: 0.2rpx;
@@ -6567,6 +6574,20 @@ _handleStreamError(msg) {
     line-height: 1.7;
     letter-spacing: 0.8rpx;
   }
+
+  // AI 回答不加粗（兜底），同时统一 H5 markdown 容器字号为 25rpx
+  .ai-message {
+    .message-bubble,
+    .selectable-md {
+      strong, b, h1, h2, h3, h4, h5, h6, th {
+        font-weight: normal !important;
+      }
+    }
+
+    .selectable-md {
+      font-size: 25rpx !important;
+    }
+  }
 }
 
 /* ========== AI 回答: 无气泡 ==========