The headless CI environment fails to create valid WebGL framebuffers,
causing PixiJS pixel reads to fail silently and GIF export to hang.
SwiftShader provides a software WebGL implementation that works reliably.
Restore the original test approach that was passing: fire-and-forget
setCurrentVideoPath, catch the switchToEditor context close, and reload
the editor window for WebCodecs initialization.
The reload was intended to ensure WebCodecs registered, but it clears
the video path state set before the editor opened, causing the editor
to load blank and the export to never complete.
The test fixture path is outside RECORDINGS_DIR, so set-current-video-path
rejects it after the path traversal fix. Copy the fixture into the app
recordings directory before loading it.
Marc Diaz