Fix iOS Safari double-tap zoom issue on score modification buttons

Problem:
- Rapid tapping on +0.001/-0.001 buttons triggered page zoom on iOS Safari
- Previous solutions (viewport meta, touch-action: manipulation) were ineffective

Solution implemented:
1. Enhanced global touch event handling in index.html:
   - Added comprehensive gesture event prevention (gesturestart/change/end)
   - Improved touchend debouncing with stopPropagation
   - Added specific CSS rules for button elements with touch-action: none

2. Modified button interaction in modify-score.vue:
   - Replaced @click events with @touchstart/@touchend handlers
   - Added preventDefault and stopPropagation on touch events
   - Implemented 100ms debounce to prevent rapid successive touches
   - Added pointer-events: none to child elements to ensure touch targets
   - Changed touch-action from 'manipulation' to 'none' for complete control

Technical details:
- touch-action: none completely disables browser touch gestures
- Event handlers use { passive: false } to allow preventDefault
- Debounce mechanism prevents accidental double-triggers
- Child elements have pointer-events: none to ensure parent handles all touches

Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pages/modify-score/modify-score.vue

@@ -50,7 +50,11 @@
       </view>
 
       <view class="score-control">
-        <view class="control-btn decrease" @touchstart.prevent="decreaseScore" @click.prevent="decreaseScore">
+        <view 
+          class="control-btn decrease" 
+          @touchstart="handleTouchStart"
+          @touchend="handleDecreaseTouch"
+        >
           <text class="btn-symbol">－</text>
           <text class="btn-value">-0.001</text>
         </view>
@@ -60,7 +64,11 @@
           <text class="no-modify-text">可不改</text>
         </view>
 
-        <view class="control-btn increase" @touchstart.prevent="increaseScore" @click.prevent="increaseScore">
+        <view 
+          class="control-btn increase" 
+          @touchstart="handleTouchStart"
+          @touchend="handleIncreaseTouch"
+        >
           <text class="btn-symbol">＋</text>
           <text class="btn-value">+0.001</text>
         </view>
@@ -114,7 +122,9 @@ export default {
       originalScore: 8.000,
       note: '',
       minScore: 5.0,
-      maxScore: 10.0
+      maxScore: 10.0,
+      lastTouchTime: 0,
+      touchDebounceDelay: 100
     }
   },
 
@@ -199,6 +209,44 @@ export default {
       uni.navigateBack()
     },
 
+    handleTouchStart(e) {
+      // 阻止默认行为，防止触发双击缩放
+      e.preventDefault()
+      e.stopPropagation()
+    },
+
+    handleDecreaseTouch(e) {
+      // 阻止默认行为和事件冒泡
+      e.preventDefault()
+      e.stopPropagation()
+      
+      // 防抖处理
+      const now = Date.now()
+      if (now - this.lastTouchTime < this.touchDebounceDelay) {
+        return
+      }
+      this.lastTouchTime = now
+      
+      // 执行减分逻辑
+      this.decreaseScore()
+    },
+
+    handleIncreaseTouch(e) {
+      // 阻止默认行为和事件冒泡
+      e.preventDefault()
+      e.stopPropagation()
+      
+      // 防抖处理
+      const now = Date.now()
+      if (now - this.lastTouchTime < this.touchDebounceDelay) {
+        return
+      }
+      this.lastTouchTime = now
+      
+      // 执行加分逻辑
+      this.increaseScore()
+    },
+
     decreaseScore() {
       if (this.currentScore > this.minScore) {
         this.currentScore = parseFloat((this.currentScore - 0.001).toFixed(3))
@@ -459,10 +507,11 @@ export default {
 }
 
 .control-btn {
-  touch-action: manipulation;
+  touch-action: none;
   -webkit-tap-highlight-color: transparent;
   user-select: none;
   -webkit-user-select: none;
+  -webkit-touch-callout: none;
   width: 140rpx;
   height: 140rpx;
   display: flex;
@@ -471,6 +520,7 @@ export default {
   justify-content: center;
   background-color: #F5F5F5;
   border-radius: 12rpx;
+  cursor: pointer;
 }
 
 .control-btn.decrease {
@@ -484,6 +534,7 @@ export default {
 .btn-symbol {
   font-size: 48rpx;
   font-weight: 300;
+  pointer-events: none;
 }
 
 .control-btn.decrease .btn-symbol {
@@ -497,6 +548,7 @@ export default {
 .btn-value {
   font-size: 24rpx;
   margin-top: 8rpx;
+  pointer-events: none;
 }
 
 .control-btn.decrease .btn-value {