Gap Limit missing on Desktop, Coin Control missing on Mobile

[4rkad]

Problem

Neither platform has both features:

Feature	Mobile	Desktop
Gap Limit	✅	❌
Coin Control	❌	✅

This is a problem for merchants using integrations like Boltz, which generate many receiving addresses. On Desktop you can't see all funds (no Gap Limit), and on Mobile you can't choose which UTXOs to spend (no Coin Control).

Request

Add Gap Limit to Desktop and Coin Control to Mobile for full feature parity.

[ardier16]

@4rkad thanks for highlighting the feature gap!

Manual coin selection is now available in Blockstream Android app 5.6.0 and is covered by #299.

A configurable gap limit for custom Electrum servers in the Blockstream desktop app is already tracked in Blockstream/green_qt#180.

Since both parts are covered by their platform-specific issues, we’ll close this combined issue as a duplicate.