Add personal user page with competitions, results, and records tabs

[coder13]

Motivation

• Provide a personal dashboard for signed-in users to see upcoming competitions and whether assignments have been generated for them.
• Allow users to review their historical performance with a Results view that can aggregate by competition or by event.
• Surface personal records in a dedicated Records tab to make personal bests easily discoverable.

Description

• Added a new page component at src/pages/User/index.tsx implementing the personal page with three tabs: upcoming, results, and records and client-side aggregation for results.
• Wired the page into the router by adding the /me route in src/App.tsx and added a My page link to the authenticated user popover in src/layouts/RootLayout/Header.tsx for quick access.
• Upcoming competitions are read from useMyCompetitionsQuery, assignment generation status is computed by fetching each competition WCIF via fetchWcif and checking the signed-in user’s assignments, and results/records are fetched using wcaApiFetch from /persons/{wca_id}/results and /persons/{wca_id} respectively.
• Uses React Query (useQuery) for data fetching and memoized aggregation for result grouping by competition or event.

Testing

• Ran a TypeScript compile check with yarn -s tsc --noEmit, which completed successfully.

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Codex Task

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