Update README screenshots

[github-actions]

Automated Screenshot Update

This PR updates the README screenshots using the latest viewer code.

Generated Screenshots

• Turn off Night Shift workflow
• Demo workflow examples

Changes

• Updated screenshot images in docs/images/

Screenshots were automatically generated by the Screenshots workflow.

[abrichr]

Closing as superseded by #20, which carries the identical result on a newer base.

Both PRs were opened by the screenshot workflow 20 minutes apart. I compared the six image blobs directly: every SHA in this branch matches #20 exactly, so there is no content here that #20 does not already have. The difference is the base — this branch is one commit behind main, #20 is current.

The branch update-screenshots-33140594044 is not deleted. Reopening is one click if #20 turns out to be wrong.

Context for anyone reading this later: these are not a cosmetic re-render. They replace a real macOS recording with the synthetic public fixtures that openadapt-capture#103 introduced, so the README images stop showing a real hostname and local developer paths.