Add contributor leaderboard

Add types, hook, UI components, and integration for leaderboard showing top users with badges

src/types/contributor.ts

@@ -0,0 +1,53 @@
+// Contributor leaderboard types
+export type AchievementLevel = 'newcomer' | 'bronze' | 'silver' | 'gold' | 'platinum' | 'legend';
+
+export type SpecialBadge = 
+  | 'park_explorer'
+  | 'ride_master'
+  | 'photographer'
+  | 'critic'
+  | 'editor'
+  | 'completionist'
+  | 'veteran'
+  | 'top_contributor';
+
+export interface ContributorStats {
+  parks_added: number;
+  rides_added: number;
+  companies_added: number;
+  models_added: number;
+  photos_added: number;
+  reviews_added: number;
+  edits_made: number;
+}
+
+export interface TotalContributorStats {
+  total_parks: number;
+  total_rides: number;
+  total_photos: number;
+  total_reviews: number;
+  total_edits: number;
+}
+
+export interface LeaderboardContributor {
+  rank: number;
+  user_id: string;
+  username: string;
+  display_name: string | null;
+  avatar_url: string | null;
+  join_date: string;
+  contribution_score: number;
+  total_score: number;
+  achievement_level: AchievementLevel;
+  special_badges: SpecialBadge[];
+  stats: ContributorStats;
+  total_stats: TotalContributorStats;
+}
+
+export interface LeaderboardData {
+  contributors: LeaderboardContributor[];
+  total_contributors: number;
+  generated_at: string;
+}
+
+export type TimePeriod = 'all_time' | 'month' | 'week';