When theme is set to 'auto', checking theme === 'dark' returns false even
when the system preference is dark mode. This caused charts and custom
styles to use light mode colors in a dark UI.
Fixed by using resolvedTheme which correctly resolves to 'light' or 'dark'
based on system preference when in auto mode.
Fixes the issue reported in PR #29 review.
- Add page title (h1) to all main pages for consistent hierarchy
- Wrap page content in container/content div structure
- Handle 404 error for unsupported OAuth excluded models API
- Add cache price input field in usage page model pricing
- Add upgrade required i18n messages for older CPA versions
- Import mixins in page-level SCSS modules
- Add ampcodeApi service for upstream URL, API key, and model mappings management
- Implement Ampcode configuration modal in AiProvidersPage
- Add complete i18n translations for Ampcode features (en and zh-CN)
- Enhance UsagePage with mobile-responsive chart improvements and legend display
- Optimize chart rendering for smaller screens
- Improve page layout styles (SystemPage, AiProvidersPage alignment)
