- display subtle birthday marker on posts when pet has birthday
- highlight birthday posts with soft accent border
- reuse central petAge utilities for consistent logic
- preserve all existing post meta information (author, time)
- avoid layout shifts by using decorative indicators only
- 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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