[GR Phase 3] Step 1 - navigation, default data logic and API call to save data

[madmax330]

Design doc section: https://docs.google.com/document/d/1Y4P7G9h0Easjcea7wyk52gKrNB9o1yTjpmJFYkrHDW4/edit?tab=t.0#bookmark=id.7j62mr7mujge

[pasyukevich]

Hi, I'm Eugene from Callstack - expert contributor group. I’d like to work on this issue.

[pasyukevich]

The needed update will be in the scope of #50904, since we need to call the BE on the second step

[melvin-bot]

This issue has not been updated in over 15 days. @madmax330, @hungvu193, @pasyukevich eroding to Monthly issue.

P.S. Is everyone reading this sure this is really a near-term priority? Be brave: if you disagree, go ahead and close it out. If someone disagrees, they'll reopen it, and if they don't: one less thing to do!