Collapse reveal toggles when navigating between wizard steps

Add per-step form validation; allow language-only filter; drop "mockup" wording

Show "Run on my own hardware" by default (useful for signed-in users too)

Signed-out estimate: show sign-in + "run on my own hardware", and clarify the button

Show the example's real bucket/path in the tutorial review Output

Add immediate loading feedback for estimate/repackage jobs

Add FastAPI wizard UI (custom frontend) alongside the Gradio app