Receive dropdown, drop the Swap tab, auto-detect pasted invoices

- Receive: replace the 3-button segmented control (too wide on mobile) with a
  compact 'Receive over' dropdown that scales to more address types.
- Remove the standalone Swap tab. Paying an invoice now lives in Send; the
  in-flight/recent swap list folds into the top of History. Deleted the dead
  swapTab + doSubmarine.
- Send: as soon as a valid bolt11 is pasted/typed/scanned into the recipient
  field, jump straight to the Lightning confirmation (submarine-swap quote with
  itemized cost) — the invoice's baked-in amount is used, so the amount field is
  skipped entirely. Wired into the recipient onInput, the paste button, and QR scan.

Verified in-browser: Swap tab gone, dropdown renders, and a pasted 60k invoice
auto-progresses to 'Pay over Lightning' with the Boltz fee shown, no Review tap.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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