feat: enhance login modal and avatar selection process

- Updated the login modal to include a user agreement section with clickable links to the user agreement and privacy policy.
- Improved button styling and layout for better user experience.
- Refactored avatar selection process to utilize local image paths, enhancing compatibility and reliability across different environments.
- Added utility functions for resolving avatar file paths and selecting images from the gallery or camera.

This update aims to streamline user interactions during login and avatar selection, ensuring a smoother experience.

miniprogram/components/login-modal/login-modal.wxml

@@ -5,17 +5,7 @@
     <view class="login-icon"><icon name="lock" size="80" color="#00CED1"></icon></view>
     <text class="login-title">登录 卡若创业派对</text>
     <text class="login-desc">{{desc}}</text>
-    
-    <button id="agree-phone-btn" class="btn-login {{agreeProtocol ? '' : 'btn-login-disabled'}}" open-type="getPhoneNumber|agreePrivacyAuthorization" bindgetphonenumber="onPhoneLogin" bindagreeprivacyauthorization="onAgreePrivacy" disabled="{{isLoggingIn || !agreeProtocol}}" hover-class="btn-login-hover">
-      <text class="btn-login-icon">📱</text>
-      <text>{{isLoggingIn ? '登录中...' : '手机号快捷登录'}}</text>
-    </button>
-    
-    <view class="privacy-wechat-row" wx:if="{{showPrivacyModal}}">
-      <text class="privacy-wechat-desc">为获取手机号，请先同意《用户隐私保护指引》</text>
-      <button id="agree-privacy-btn" class="privacy-agree-btn" open-type="agreePrivacyAuthorization" bindagreeprivacyauthorization="onAgreePrivacy" hover-class="privacy-agree-btn-hover">同意</button>
-    </view>
-    <view class="login-modal-cancel" wx:if="{{showCancel}}" bindtap="onClose">取消</view>
+
     <view class="login-agree-row" catchtap="onToggleAgree">
       <view class="agree-checkbox {{agreeProtocol ? 'agree-checked' : ''}}"><icon wx:if="{{agreeProtocol}}" name="check" size="24" color="#34C759"></icon></view>
       <text class="agree-text">我已阅读并同意</text>
@@ -23,5 +13,16 @@
       <text class="agree-text">和</text>
       <text class="agree-link" catchtap="onOpenPrivacy">《隐私政策》</text>
     </view>
+
+    <button id="agree-phone-btn" class="btn-login {{agreeProtocol ? '' : 'btn-login-disabled'}}" open-type="getPhoneNumber|agreePrivacyAuthorization" bindgetphonenumber="onPhoneLogin" bindagreeprivacyauthorization="onAgreePrivacy" disabled="{{isLoggingIn || !agreeProtocol}}" hover-class="btn-login-hover">
+      <icon class="btn-login-icon" name="smartphone" size="36" color="#ffffff"></icon>
+      <text>{{isLoggingIn ? '登录中...' : '手机号快捷登录'}}</text>
+    </button>
+
+    <view class="privacy-wechat-row" wx:if="{{showPrivacyModal}}">
+      <text class="privacy-wechat-desc">为获取手机号，请先同意《用户隐私保护指引》</text>
+      <button id="agree-privacy-btn" class="privacy-agree-btn" open-type="agreePrivacyAuthorization" bindagreeprivacyauthorization="onAgreePrivacy" hover-class="privacy-agree-btn-hover">同意</button>
+    </view>
+    <view class="login-modal-cancel" wx:if="{{showCancel}}" bindtap="onClose">取消</view>
   </view>
 </view>

miniprogram/components/login-modal/login-modal.wxss

@@ -13,8 +13,9 @@
   padding: 48rpx;
 }
 .modal-content {
+  position: relative;
   width: 100%;
-  max-width: 600rpx;
+  max-width: 560rpx;
   background: #1c1c1e;
   border-radius: 32rpx;
   overflow: hidden;
@@ -25,6 +26,10 @@
   right: 24rpx;
   z-index: 1;
   padding: 16rpx;
+  margin: 0;
+  background: transparent;
+  border: none;
+  line-height: 0;
 }
 .login-modal {
   padding: 48rpx 32rpx;
@@ -41,18 +46,30 @@
   color: #ffffff;
   display: block;
   margin-bottom: 16rpx;
+  text-shadow: none;
+  -webkit-text-fill-color: #ffffff;
+  max-width: 100%;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 .login-desc {
   font-size: 26rpx;
   color: rgba(255, 255, 255, 0.5);
   display: block;
-  margin-bottom: 48rpx;
+  margin-bottom: 32rpx;
+  max-width: 100%;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 .btn-login {
   display: flex;
   align-items: center;
   justify-content: center;
   gap: 16rpx;
+  width: 100%;
+  box-sizing: border-box;
   padding: 28rpx;
   background: linear-gradient(135deg, #00CED1, #00B4D8);
   color: #ffffff;
@@ -61,19 +78,31 @@
   border-radius: 24rpx;
   margin-bottom: 20rpx;
   border: none;
+  line-height: 1.2;
 }
 .btn-login::after { border: none; }
 .btn-login-icon {
-  font-size: 36rpx;
-  line-height: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+}
+.btn-login-disabled { opacity: 0.55; }
+.btn-login[disabled] {
+  opacity: 0.55;
 }
-.btn-login-disabled { opacity: 0.6; }
 .login-modal-cancel {
-  margin-top: 24rpx;
-  padding: 24rpx;
+  display: block;
+  width: 100%;
+  margin-top: 8rpx;
+  padding: 20rpx 24rpx 8rpx;
   font-size: 28rpx;
   color: rgba(255, 255, 255, 0.5);
   text-align: center;
+  background: transparent;
+  border: none;
+  box-sizing: border-box;
+  cursor: pointer;
 }
 .privacy-wechat-row {
   margin: 24rpx 0;
@@ -100,11 +129,16 @@
 .login-agree-row {
   display: flex;
   flex-wrap: wrap;
-  align-items: center;
-  justify-content: center;
-  margin-top: 32rpx;
+  align-items: flex-start;
+  justify-content: flex-start;
+  width: 100%;
+  box-sizing: border-box;
+  margin-top: 0;
+  margin-bottom: 32rpx;
+  padding: 0 8rpx;
   font-size: 22rpx;
   color: rgba(255, 255, 255, 0.5);
+  text-align: left;
 }
 .agree-checkbox {
   width: 32rpx;
@@ -127,6 +161,11 @@
   color: #00CED1;
   text-decoration: underline;
   padding: 0 4rpx;
+  margin: 0;
+  background: transparent;
+  border: none;
+  font-size: inherit;
+  line-height: inherit;
 }
 
 /* 显式 hover 类名，避免基础库 3.x 报 hoverClass / hoverClassDisable 类型非法 */