style(components): add dark theme tokens for dropdown and suggestion surfaces

[SonyLeo]

dropdown 和 suggestion 暗色适配

文档预览👉

截图对比

修改前

修改后

• 为 dropdown、flow layout、suggestion popover、tooltip、suggestion pills 补充统一主题 token。
• 清理组件内硬编码颜色，改为复用 variables.css 中的全局变量。
• 优化暗色模式下 suggestion pill 的背景和 hover 对比度。

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📥 Commits

Reviewing files that changed from the base of the PR and between 6ab87ee and 9584518.

📒 Files selected for processing (9)

• packages/components/src/dropdown-menu/index.vue
• packages/components/src/flow-layout-buttons/index.vue
• packages/components/src/styles/variables.css
• packages/components/src/suggestion-pills/components/PillButton.vue
• packages/components/src/suggestion-pills/index.vue
• packages/components/src/suggestion-popover/components/Header.vue
• packages/components/src/suggestion-popover/components/Loading.vue
• packages/components/src/suggestion-popover/components/Tooltip.vue
• packages/components/src/suggestion-popover/index.vue

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