[STORY] v4-S25: Visual regression testing

[raifdmueller]

User Story

As a project maintainer, I want visual regression tests to catch unintended theme changes.

Acceptance Criteria

Given reference screenshots of the new theme
When the site is regenerated
Then visual diff against reference shows no unintended changes
And Lighthouse performance score is above 90
And page load time is under 1 second

Priority: Could

Epic: v4-E4 (#6)

Blocked by: v4-S21, v4-S22, v4-S23

[raifdmueller]

Analysis

Tools

• Percy or Playwright screenshots for visual regression
• Lighthouse CI for performance metrics
• Reference screenshots stored in repo

Could priority — implement after all other E4 stories are done.

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