feat: ai问答

pages/wiki/chat/index.js

@@ -10,6 +10,7 @@ Page({
     _counter: 0,
     quotaRemaining: -1,
     quotaLimit: 0,
+    _pendingPrefill: '',
   },
 
   onLoad(options) {
@@ -23,8 +24,9 @@ Page({
         this.setData({ messages: msgs, _counter: 2 }, () => this.scrollToBottom());
       });
     } else if (options && options.prefillQuestion) {
-      const q = decodeURIComponent(options.prefillQuestion);
-      this.setData({ inputValue: q }, () => this.onSend());
+      // Only save the question; actual send waits for quota check in onShow
+      this._pendingPrefill = decodeURIComponent(options.prefillQuestion);
+      this.setData({ inputValue: this._pendingPrefill });
     }
   },
 
@@ -38,6 +40,16 @@ Page({
         quotaRemaining: res.remaining,
         quotaLimit: res.limit,
       });
+      // Auto-send prefill question only after quota is confirmed
+      if (this._pendingPrefill) {
+        const q = this._pendingPrefill;
+        this._pendingPrefill = '';
+        if (res.remaining > 0) {
+          this.onSend();
+        } else {
+          wx.showToast({ title: '今日问答次数已用完，明天再来吧', icon: 'none', duration: 2500 });
+        }
+      }
     }).catch(() => {});
   },
 

pages/wiki/chat/index.wxml

@@ -9,6 +9,11 @@
     show-scrollbar="{{false}}"
     scroll-with-animation
   >
+    <!-- Floating History Button (always visible) -->
+    <view class="chat-history-float" bindtap="goToHistory" wx:if="{{messages.length > 0}}">
+      <t-icon name="time" size="28rpx" color="#558B2F" />
+      <text>历史记录</text>
+    </view>
     <!-- Welcome -->
     <view class="welcome" wx:if="{{messages.length === 0}}">
       <view class="welcome-glow"></view>

pages/wiki/chat/index.wxss

@@ -12,6 +12,23 @@
   overflow-y: hidden;
 }
 
+.chat-history-float {
+  display: flex;
+  align-items: center;
+  gap: 8rpx;
+  justify-content: center;
+  background: rgba(255, 255, 255, 0.85);
+  backdrop-filter: blur(10px);
+  padding: 12rpx 28rpx;
+  border-radius: 32rpx;
+  font-size: 24rpx;
+  font-weight: 600;
+  color: #558B2F;
+  width: fit-content;
+  margin: 0 auto 24rpx;
+  box-shadow: 0 4rpx 12rpx rgba(0, 0, 0, 0.06);
+}
+
 /* ── Welcome ── */
 .welcome {
   display: flex;