fix: prevent race condition and memory leaks in MatchingPage

[ArtemZhyto]

This PR addresses a high-severity race condition in MatchingPage.tsx where rapid user input changes could cause stale data to overwrite the latest results.

Changes:

1. Race Condition Fix: Implemented a cleanup flag pattern (isCancelled) within useEffect. This ensures that only the response from the most recent request is applied to the state.
2. Request Coordination: Used Promise.all to synchronize getMatchDetails and getMatchGroups updates, preventing UI flickering.
3. Memory Leak Prevention: The cleanup function now correctly prevents React state updates if the component unmounts while requests are still pending.
4. Root Cause Analysis: Previously, parallel async requests could return out of order. If an older request resolved after a newer one, the UI would display outdated information. This fix guarantees that data remains consistent with the user's current input.

Fixes #279