[samjulien]

Local onboarding currently requires clicking through six introductory screens before entering a name. This consolidates the existing content into one animated introduction, followed by the self-hosting screen and the final name screen.

Stacked on #861. Review this PR against codex/openbot-ux-review; merge #861 first, then retarget this PR to main.

What changed

• The introduction cycles through the existing welcome, computer, and Bot roster illustrations. Local evaluations also include the existing local-storage and custom-agent content.
• Scenes advance every four seconds and loop automatically, without pagination, playback controls, or a Replay button.
• Continue is available without waiting for the animation to finish. Local evaluators then see “Deploy it for your organization,” followed by “Let's get to it.” and name entry.
• Organization deployments continue to omit local-evaluation content and go directly from the introduction to name entry.
• Reduced-motion users see the introduction content as a static sequence.
• Navigation uses named steps so loading deployment capabilities cannot shift the active screen. Capability-loading errors have a retry action.
• Existing name saving and onboarding completion behavior are retained.

Validation

• Reviewed the local flow in Chrome, including Continue and Back navigation.
• Formatting and lint passed for both changed files.
• App typecheck and production build passed.
• All eight profile/onboarding name-save regression tests passed (17 assertions).