Keep website screenshots and videos aligned with the latest app release

[olerida]

Summary

Update the website visual assets whenever a new Settle version changes the app UI or user flow. Screenshots and videos should represent the latest published app release.

Scope

• Refresh the light and dark app screenshots used by the website.
• Re-record the product demo when layout saving, restoration, or window actions change.
• Re-record the installation walkthrough when installation, first launch, or Accessibility permission steps change.
• Regenerate video posters and the social preview when their source visuals become outdated.
• Keep all localized alt text and video labels accurate in English, Spanish, Catalan, French, and German.

Acceptance criteria

• Website screenshots match the latest GitHub release.
• Product demo and installation video show the current app UI and behavior.
• Posters and Open Graph preview use current visuals.
• Videos play correctly on Safari, Chrome, and mobile layouts.
• npm run build completes without errors.

Assets to review

• web/public/settle-menu-light.png
• web/public/settle-menu-dark.png
• web/public/Demo Settle.mov
• web/public/install.mp4
• web/public/demo-poster.jpg
• web/public/settle-preview.png