Error: A snapshot doesn't exist at .../example.spec.ts-snapshots/home-chromium-linux.png, writing actual.

Why this happens

• This is the first run of a new visual test and no baseline has been committed yet
• Baselines were generated on macOS (`-darwin.png`) but CI runs on Linux (`-linux.png`), so the filename Playwright looks for doesn't exist
• A new browser project was added to the config, and it has no baselines of its own yet
• The snapshot folder is excluded by `.gitignore`, so baselines never reached the CI checkout

How to fix it

1. Generate baselines with `npx playwright test --update-snapshots`, review the images, and commit them
2. Generate Linux baselines inside the same Docker image CI uses (`mcr.microsoft.com/playwright:<version>`) so fonts and rendering match
3. Don't let CI silently accept the 'writing actual' image as the new baseline. Update snapshots deliberately in a reviewed PR

Example

              # Generate Linux baselines locally in the same image CI uses
docker run --rm -v $(pwd):/work -w /work \
  mcr.microsoft.com/playwright:v1.55.0-noble \
  npx playwright test --update-snapshots