[Medium Priority] Player Profile / Settings Page

[Lstsk]

Display player statistics (e.g., win/loss ratio, rank, rating history).
Show achievements or badges for milestones (e.g., 100 games played).

Complete UI
and mock backend endpoints if needed

[Lstsk]

Settings page, look https://online-go.com/settings/theme

[Lstsk]

check #65 for initial progress.