Misc. UI Fixes

Just a few tweaks I noticed when running on my browser!

1. Should be able to tap entire date cells in the sidebar to show question, right now only tapping the date text works
2. Change question title text color when creating a question to black
3. Can you double check all the fonts? it looks like there are some inconsistencies with bolding and colors from the designs

首先在浏览器中复现这三个 UI 问题：测试侧边栏中的完整日期单元格，检查创建问题时的问题标题，并将字体粗细和颜色与设计稿进行比较。完成的标准是整个日期单元格都可以点击，创建时的标题使用黑色文本，并且可见的字体不一致问题已得到解决。

由索引模型根据 Issue 内容生成。