Fix create invoice sheet not visible

[kingonly]

Summary

• AmountPanel's BottomSheetContainer was nested inside the parent Receive dialog's BottomSheetContainer. CSS transforms on the parent's Transition.Child created a new containing block, so the inner sheet's absolute top-0 positioned relative to the parent card (near the bottom of the viewport) instead of the viewport itself — rendering it off-screen.
• Fix: Move AmountPanel outside the parent BottomSheetContainer as a sibling, so it renders at the top level with correct viewport-relative positioning.
• Also gate AmountPanel's isOpen on the parent dialog's isOpen to ensure it closes when the Receive dialog is dismissed.

Test plan

• Open Receive → Lightning tab → click "Create invoice with specific amount" → verify the Create Invoice sheet appears
• Enter an amount and generate an invoice → verify QR code displays
• Close the Create Invoice sheet → verify Receive dialog is still functional
• Close the Receive dialog while Create Invoice sheet is open → verify both close
• Verify the Confirm Username Change dialog still works when changing Lightning Address

🤖 Generated with Claude Code

[vercel]

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