feat(首页): 删掉孕期每日小打卡；工具卡图标只留 LOGO 里的图形并改矢量 (v26093021)

- 删除首页「孕期每日小打卡」模块：HTML、.daily-check/.dc-* 样式、renderDaily 及产后收起逻辑、
  三张专用图标。工具区重新成为首页第一块（首块间距规则本就按 :first-child 走）。
- 五张工具卡图标去掉 LOGO 外面的圆角方块 / 圆环底，只留里面的图形，全部改成 SVG：
  数胎动小脚丫、胎儿估重表盘、数宫缩波形直接取自工具页原 SVG；
  孕期体重（原图 128px webp）、孕检日历（原图 100px png）原图太小放大发糊，照原图配色重画为矢量。
- 图标位置微调，避开「记录」按钮和标题。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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