Improve board calibration, Lichess recovery and voice controls

[vitito93]

What changed

• Stabilized corner detection by combining several frames instead of relying on a single prediction.
• Added a robust projective grid fit that uses all visible 7×7 intersections to calculate the outer board corners.
• Improved move detection stability to reduce occasional false positives.
• Rebuilt Lichess positions from the complete move stream, including takebacks and variations.
• Added automatic stream reconnection and recovery after rejected moves.
• Added a desynchronization state that pauses camera moves until the physical board matches Lichess again.
• Fixed the React crash caused by rendering Error objects directly.
• Added an optional voice mode that suspends camera inference and accepts legal chess commands in Spanish and English.

Why

Corner detection could vary even with a static camera, and Lichess takebacks could leave the local board in an unrecoverable state. Voice input also provides a useful fallback when the camera setup is unreliable.

Voice commands are always resolved against the current legal moves, so ambiguous or illegal commands are rejected instead of guessed.

Examples

• Alfil C3
• C4 a C5
• Bishop C3
• C4 to C5
• Enroque corto
• Castle kingside

Validation

• TypeScript check
• ESLint
• Production build with npm run build