添加light主题

[oooyuy92]

Problem

目前的dark主题会有点看不清，而且·后面的对话没有缩进，目前看起来很乱，如果能够添加light主题和针对工具、思考的·后添加缩进，会看上去更清晰。

Proposed solution

Alternatives considered

Additional context

[Hmbown]

this is planned - thank you!!

[mac119]

这个效果可以吗？

[MMMarcinho]

这个效果可以吗？

感觉背景色是一方面，现在文字本身颜色的差异太小了，导致看文字都是一个颜色会很费力

[Hmbown]

Status update while cutting v0.8.17: the release now includes the /theme command with built-in Light/Dark themes, so the first part of this is shipped.

I’m leaving the issue open because the later comments are right: readability is more than background color. We still need a focused pass on contrast between message/tool/thinking text and on indentation/layout for tool + thinking blocks. Best next patch is a small palette/layout change with screenshots or snapshot coverage so we can verify the visual difference.

[Hmbown]

v0.8.18 includes a small palette/readability improvement in draft release PR #1094, including light-theme adaptation for the new reasoning/body text colors.

I am not closing this yet. The release only tunes contrast and long-session readability; it does not finish the broader light-theme polish requested here. Keeping this open for a later visual QA pass is the safer call.