fix: remove broken extracted test files and fix compilation

[noahgift]

Commits 91ca64b and 154a679 split test files at raw line boundaries breaking Rust syntax. Remove malformed parts 1-15 of perf_trace_tests, remove stale extracted test files (chart_tests, runtime_tests, a11y_tests, executor_tests, app_tests, render_tests), and fix all Event::KeyDown/KeyUp initializers with missing modifiers field.