Added individual team member badges and developed a separate table to display individual leaderboard

Summary

• Added Individual Member Rankings table on the Leaderboard Ranking page showing all members across teams ranked by score
• Achievement badges: sprint_star, top_committer, merge_master, team_player (highest scorer per team), hackathon_hero, consistency_champ
• Members can hold multiple badges, rendered as SVGs with name labels

Bug Fixes

• Commit SHA deduplication to prevent inflated counts
• Case-insensitive username deduplication preserving original casing
• Username casing now uses canonical GitLab API response

Badge System All members across teams are sorted by score. Badges are assigned by achievement category:

Badge	Awarded To
team_player	Highest scorer in each team (one per team)
sprint_star	Highest overall score across all members
top_committer	Most total commits
merge_master	Most MRs merged
hackathon_hero	Highest combined total (commits + MRs merged + issues closed)
consistency_champ	Most balanced contributor — non-zero in all 3 metrics with smallest coefficient of variation