Add min-width: 220px to inline setting labels to create consistent
'tab stops' so buttons align vertically regardless of label length.
Remove constraint on mobile where settings stack vertically.
- Add paragraphAlignment setting (left/justify) to UserSettings interface
- Add UI control with icon buttons in ReadingDisplaySettings
- Apply alignment via CSS variable to reader content and preview
- Default to left-aligned to maintain current behavior
- Keep headings always left-aligned for better readability
- Define semantic color tokens (--color-bg, --color-text, etc.)
- Add .theme-dark, .theme-light, .theme-system CSS classes
- Create theme.ts utility for theme application
- Add early boot theme script to prevent FOUC
- Support system preference with live updates
- Add max-width: 100% and overflow handling to preview content
- Add word-break and overflow-wrap to prevent text overflow
- Make inline settings stack vertically on mobile
- Reduce padding on mobile for settings view
- Make zap preset buttons flex to fit mobile width
- Ensure all setting controls respect viewport width
- Fix preview heading size on mobile
