v0.3.0 - Player names and computer mode

Highlights

• Added custom black and white player names across status, results, scores, move history, and recent match summaries.
• Added optional local computer mode while keeping two-player as the default.
• Added a deterministic computer move selector that can win, block immediate threats, and choose nearby open cells.
• Added engine tests for computer move selection.
• Included the previous accessibility and recent-match improvements in the 0.3.0 changelog.

Verification

• node --check src/engine.js
• node --check src/main.js
• node --test
• Local Chrome automation for custom names, computer mode, and undo behavior
• GitHub Actions CI
• GitHub Pages deployment