Show veHNT positions on Migrate to World review screen

[bryzettler]

Summary

• Migrate to World review (confirm) screen now lists the wallet's owned veHNT positions with a count and a note that they move automatically. The migrate API re-enumerates positions on-chain, so the client never selects them; this makes that visible before the user confirms.
• Proxied-to-me positions are excluded from the count. The row is hidden when the count is zero.
• Also carries the earlier EAS large-worker change for Android store builds (eas.json).

Test plan

• yarn lint passes
• Open Settings → Migrate to Helium World with a wallet holding veHNT positions, proceed to the review step, and confirm the "veHNT positions" row and note render under the token lines
• Repeat with a wallet holding no positions and confirm the row is absent