feat(开始页面): 添加完成按钮图片并在进度完成时切换

当进度图片数量达到5时，将开始按钮替换为完成按钮图片

src/pages/start/index.vue

@@ -22,9 +22,10 @@ const ASSETS = {
   badge3: '/static/start/badge3.webp',
   badge4: '/static/start/badge4.webp',
   badge5: '/static/start/badge5.webp',
+  finishBtn: '/static/start/finishBtn.webp',
 };
 
-const progressImgs = ref(0);
+const progressImgs = ref(5);
 
 const getProgressImage = () => {
   switch (progressImgs.value) {
@@ -128,7 +129,7 @@ const closeSidebar = () => {
       <!-- 按钮区域 -->
       <view class="btn-group">
         <view class="btn-item" @click="handleStart">
-          <image class="btn-img start-btn" :src="ASSETS.startBtn" mode="widthFix" />
+          <image class="btn-img start-btn" :src="progressImgs === 5 ? ASSETS.finishBtn : ASSETS.startBtn" mode="widthFix" />
         </view>
         
         <view class="btn-item" @click="handleRestart">