[Feature] Customizable colors/Themes

需求描述 | Feature Description

I use the Nord-colored theme in Firefox and in the DarkReader extension. When I open the Gemini web app, everything is in calm, bluish colors. Everything, that is, except for the UI elements (scrollbar, prompt manager) added by the Voyager extension. Since Voyager is highly customizable and already adds opinionated, UI-centric features like the Sakura effect, wouldn't it make sense to add the ability to customize its UI colors from the settings menu?

解决方案 | Proposed Solution

Add a section to Voyager settings that allows users to set colors for the UI added by the extension. Probably 3–4 variables, such as base, highlight, and text colors, are enough.

替代方案 | Alternatives Considered

It is possible, of course, to try to override colors with Stylus/Stylish userstyles. But it's hacky, error-prone and might break with Voyager updates.

补充信息 | Additional Information

贡献意愿 | Contribution

• 我愿意为该功能贡献代码 / I am willing to contribute code for this feature
• 其他贡献者可评论 /claim 认领此 Issue / Other contributors can comment /claim to claim