Implement Addresses list in Settings screen

[pseudoramdom]

Add support to view receive and change addresses. (Implements #519)

• Add addresslistmodel
  • exposes wallet-owned receive and change addresses to QML including labels, usage state, balances, formatter amounts, script type etc.
  • This will be owned by WalletQmlModel which provides helper methods related to addresses.
• Add a reusable control SegmentedPicker.qml for segmented picker with multiple options.

Tests

• Updated functional wallet harness so app-only GUI tests do not require a built bitcoind.

Review notes

• This PR is stacked on top of Fee selection #546 (a4de80b)
• Begin reviewing from 3dffdc7

Screenshots

[johnny9]

Can we try to reuse the toggle buttons in the NetworkTraffic page?

[pseudoramdom]

Can we try to reuse the toggle buttons in the NetworkTraffic page?

Good callout.
I’ll update SegmentedPicker to use ToggleButton internally, so it gets the same visual interaction style as NetworkTraffic. I'd still keep the SegmentedPicker since it's a higher-level grouped control: it takes a model, owns currentIndex, emits selected(index, option), and avoids repeating the RowLayout + Repeater + checked/index wiring anywhere we need a segmented choice.

[pseudoramdom]

Rebased on top of #546 (e5fab68)