feat: 允许没有背景

[ShadowLemoon]

No description provided.

[ShadowLemoon]

@copilot 解决一下https://github.com/AlkaidLab/foundation-sunshine/pull/636这里review里的问题

[Copilot]

@copilot 解决一下https://github.com/AlkaidLab/foundation-sunshine/pull/636这里review里的问题

已修复两个 review 问题 (commit fix: add localStorage error handling and cleanup for event listeners):

1. LogsSection.vue: 为 dev mode 的 localStorage 读写添加了 readDevMode() / writeDevMode() 封装，使用 try-catch 防止受限环境下崩溃。
2. useBackground.js: 使用 onScopeDispose 清理 MutationObserver 和 sunshine-background-bypass 事件监听器，防止内存泄漏。

[chatgpt-codex-connector]

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Reviewed commit: 44b710bb17

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[chatgpt-codex-connector]

Reset text colors when bypassing the background

When no-background mode is enabled after a local custom background was used, this path clears only the inline image and returns before resetting the text CSS variables/body bg-light/bg-dark class that setTextColorTheme previously installed. The page then renders the plain fallback body background with colors chosen for the hidden old image (theme changes also re-run brightness checks against that hidden image), so titles/subtitles can have the wrong contrast until a background is selected or cleared. Reset the text theme when bypassing the image.

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