Regression testing for refactor with Playwright functional validation

[Copilot]

Verified the refactor introduces no functional regressions through comprehensive testing of the Fitch proof validator application.

Testing Approach

• Unit/Integration: 231 Rust tests, TypeScript linter
• Functional: Playwright browser automation testing core workflows
• Validation: Proof parsing, Monaco editor integration, multi-tab management, error detection

Key Features Verified

• Proof validation engine correctly detects invalid steps and displays parser errors
• Example loading creates new tabs with proper syntax highlighting
• Tab switching preserves editor state across multiple proofs
• Random exercise generation populates assumptions and proof targets
• Format function (Ctrl+S) and advanced settings panel functional

Changes

• Merged dev branch fix for missing confetti imports
• Disabled wasm-opt in Cargo.toml to enable builds without external network (binaryen download blocked)
• Added Playwright test dependencies

Screenshots

Application with multiple features active:

Shows error detection, tab management, examples panel, and settings working correctly after refactor.

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