- fix post preview modal height and scrolling (comments fully visible)
- prevent bottom navigation from overlapping modal content
- cleanup duplicate global CSS definitions
- normalize spacing and overflow behavior across feed and explore
- improve overall layout stability on mobile devices
- introduce global design system via CSS variables
- modern green-based color palette with improved readability
- unify Feed, Explore and Profile visual language
- add discovery posts visual highlight via border (no text shift)
- improve card depth, shadows and container consistency
- stabilize personalized feed logic (subscriptions + discovery)
- prepare UI for future theming without TSX changes
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