feat: enhance layout components, data layer and global styles
- SidebarRail, TopBar, FilterBar: improved navigation and filtering UX
- metrics.js, requests.js: expanded data with multi-range trend series
- composables: enhanced useChat, useNavigation, useRequests
- global.css: refined design tokens and utility classes
- Add DocFilterBar component and LoginView page
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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