fix(mp): T40 UI 审计修复 — 28 项设计系统合规 + MCP forceSetAuth bridge

T40 小程序 UI 审计全部 60 页面，发现 28 项问题（HIGH×3 MEDIUM×10 LOW×15），
全部修复并通过静态验证（0 硬编码 border-radius/font-size 残留）。

主要修复：
- border-radius: 12 个文件硬编码值 → $r-xs/$r-lg/$r-pill 设计 token
- touch target: 5 个交互元素添加 min-height: 48px（action-inbox/mall/family/medication）
- elder-mode 页面接入 useElderClass()，预览字号改用 var(--tk-font-body)
- consultation 页面增加加载失败 toast 提示
- app.tsx 新增 forceSetAuth bridge 解决 MCP auth 注入兼容问题
- FAB 按钮和开关控件尺寸规范化

审计结果：PASS 41 / PASS_WITH_ISSUES 19 → 修复后全量 PASS

apps/miniprogram/src/pages/pkg-profile/elder-mode/index.scss

@@ -67,7 +67,7 @@
 .elder-mode-switch {
   width: 52px;
   height: 30px;
-  border-radius: 15px;
+  border-radius: $r-pill;
   background: $bd;
   position: relative;
   transition: background 0.25s;
@@ -80,7 +80,7 @@
 .elder-mode-switch-thumb {
   width: 26px;
   height: 26px;
-  border-radius: 13px;
+  border-radius: $r-pill;
   background: $card;
   position: absolute;
   top: 2px;
@@ -122,7 +122,7 @@
   transition: font-size 0.25s;
 
   &--large {
-    font-size: 21px;
+    font-size: var(--tk-font-body);
   }
 }
 

apps/miniprogram/src/pages/pkg-profile/elder-mode/index.tsx

@@ -1,12 +1,14 @@
 import { View, Text } from '@tarojs/components';
 import Taro from '@tarojs/taro';
 import { useUIStore } from '../../../stores/ui';
+import { useElderClass } from '../../../hooks/useElderClass';
 import './index.scss';
 
 export default function ElderMode() {
   const mode = useUIStore((s) => s.mode);
   const setMode = useUIStore((s) => s.setMode);
   const isElder = mode === 'elder';
+  const modeClass = useElderClass();
 
   const handleToggle = () => {
     const next = isElder ? 'normal' : 'elder';
@@ -19,7 +21,7 @@ export default function ElderMode() {
   };
 
   return (
-    <View className='elder-mode-page'>
+    <View className={`elder-mode-page ${modeClass}`}>
       <View className='elder-mode-card'>
         <View className='elder-mode-header'>
           <Text className='elder-mode-icon'>老</Text>

apps/miniprogram/src/pages/pkg-profile/family/index.scss

@@ -100,9 +100,15 @@
 .family-edit {
   flex-shrink: 0;
   margin-left: 16px;
-  padding: 8px 20px;
+  padding: 14px 24px;
   border: 1px solid $bd;
   border-radius: $r-pill;
+  min-height: 48px;
+  @include flex-center;
+
+  &:active {
+    background: $bd-l;
+  }
 }
 
 .family-edit-text {

apps/miniprogram/src/pages/pkg-profile/followups/index.scss

@@ -38,7 +38,7 @@
   width: 32px;
   height: 4px;
   background: $pri;
-  border-radius: 2px;
+  border-radius: $r-xs;
 }
 
 .task-list {

apps/miniprogram/src/pages/pkg-profile/medication/index.scss

@@ -89,8 +89,8 @@
 }
 
 .toggle {
-  width: 80px;
-  height: 44px;
+  width: 84px;
+  height: 48px;
   border-radius: $r-pill;
   padding: 4px;
   position: relative;
@@ -106,8 +106,8 @@
 }
 
 .toggle-dot {
-  width: 36px;
-  height: 36px;
+  width: 40px;
+  height: 40px;
   border-radius: 50%;
   background: $card;
   position: absolute;
@@ -126,7 +126,9 @@
 .delete-btn {
   font-size: var(--tk-font-h2);
   color: $dan;
-  padding: 4px 12px;
+  padding: 14px 16px;
+  min-height: 48px;
+  @include flex-center;
 }
 
 .form-card {