Bolt: Review, fix and merge open PRs #6 and #7

[Inmerson]

Task

Review the 2 open performance optimization PRs and merge them if correct:

• ⚡ Optimize MatrixInput state updates #6 - Optimize MatrixInput state updates (reduce re-renders with local state + blur/enter propagation)
• ⚡ Optimize Matrix Determinant Calculation (O(N!) -> O(N^3)) #7 - Optimize Matrix Determinant Calculation O(N!) → O(N^3) (Gaussian elimination)

Both PRs were created by Jules AI agent and Copilot is already set as reviewer.

Actions needed

1. Review code correctness and test coverage
2. If tests pass and logic is correct → approve and merge
3. If there are issues → fix them directly on the PR branch