Port missing v60 UI/UX improvements to iOS

[jvsena42]

Summary

Several UI/UX improvements merged on Android need to be ported to iOS. This issue tracks all of them.

Changes to port

• Middle-ellipsis address truncation on Receive screen (Android #886)

  • Replace .lineLimit(2) tail truncation with middle-ellipsis so users see both start and end of address
  • iOS already has String.ellipsis() utility that supports .middle style — reuse it

• Connection Issues overlay on Send/Receive/Transfer views (Android #878)

  • Add ConnectionIssuesView overlay that shows when network is lost during Send, Receive, Force Transfer, and Transfer flows
  • Auto-dismiss when connectivity is restored
  • Note: SyncNodeView on SendSheet already exists on iOS; the missing piece is the network-loss overlay
  • Also includes: awaitPeerConnected() before cooperative channel close (iOS currently just sleeps 2s)

• Update Funding screen to match v60 design (Android #885)

  • Replace "Advanced" button with "Manual Setup" shortcut (navigate directly to external node flow)
  • Update description text to: "The easiest option is to use your Bitkit savings or send bitcoin from a different wallet."
  • Note: "Use other wallet" → CJIT navigation already works on iOS

• Update External Success screen (Android #883)

  • Change title from "Connection initiated" to "Channel opening"
  • Replace "switch" image with "lightning" illustration (asset already exists in iOS)
  • Change nav title from "Lightning Connection" to "Spending Balance"

• Transfer from Savings button on empty Spending screen (Android #882)

  • Show "Transfer From Savings" button when spending balance is zero, no activity, and savings balance > 0
  • Navigate to transfer-to-spending flow

Key iOS files

• Bitkit/Views/Wallets/Receive/ReceiveQr.swift
• Bitkit/Components/CopyAddressCard.swift
• Bitkit/Components/SyncNodeView.swift
• Bitkit/Views/Wallets/Send/SendSheet.swift
• Bitkit/Views/Transfer/FundingOptions.swift
• Bitkit/Views/Transfer/FundManualSuccessView.swift
• Bitkit/Views/Wallets/SpendingWalletScreen.swift
• Bitkit/Managers/NetworkMonitor.swift