chore: add network graph dump on Lightning send errors

[jvsena42]

Description

This PR adds comprehensive network graph debugging information when Lightning payments fail. When a send error occurs, the new dumpNetworkGraphInfo function logs:

• Invoice info (payment hash)
• Our node ID
• Channel details (capacity, usable/announced status)
• Connected peers
• RGS sync configuration and timing
• Network graph statistics (node/channel counts)
• Trusted peer presence in the graph

This mirrors the existing Android implementation and helps diagnose routing failures.

For testing:
Try to pay a lightning invoice twice

Linked Issues/Tasks

N/A - Debugging enhancement

Screenshot / Video

N/A - Internal logging functionality

[jvsena42]

Draft for testing

[jvsena42]

I see iOS has a similar method dumpLdkLogs

[jvsena42]

They have different info

*****LDK-NODE LOG******
[2026-02-05 10:29:43.842 UTC] INFOℹ️: ✅ Sync completed: type=onchainWallet height=61707 [LightningService.swift: listenForEvents(onEvent:) line: 1039]
[2026-02-05 10:29:43.842 UTC] INFOℹ️: Sync completed: onchainWallet at height 61707 [WalletViewModel.swift: start(walletIndex:) line: 179]
[2026-02-05 10:29:44.069 UTC] DEBUG: Starting transaction sync. - [LDK] [lightning_transaction_sync::electrum:92] [Logger.swift: log(record:) line: 171]
[2026-02-05 10:29:44.070 UTC] PERF: refreshCache() took 0.2 seconds on ldk queue [ServiceQueue.swift: background(_:_:functionName:) line: 58]
[2026-02-05 10:29:44.070 UTC] DEBUG: Checking 0 pending transfers to spending [BalanceManager.swift: getPendingChannelsSats(transfers:channels:balances:) line: 140]
[2026-02-05 10:29:44.070 UTC] DEBUG: Available channels: 1, Lightning balances: 1 [BalanceManager.swift: getPendingChannelsSats(transfers:channels:balances:) line: 141]
[2026-02-05 10:29:44.071 UTC] DEBUG: Active transfers: 0 [BalanceManager.swift: deriveBalanceState() line: 84]
[2026-02-05 10:29:44.071 UTC] DEBUG: Balances in ldk-node: onchain=73517 lightning=24903 [BalanceManager.swift: deriveBalanceState() line: 87]
[2026-02-05 10:29:44.071 UTC] DEBUG: Balances in state: onchain=73517 lightning=24903 toSavings=0 toSpending=0 lnSubtract=0 ordersOnchainSubtract=0 [BalanceManager.swift: deriveBalanceState() line: 90]
[2026-02-05 10:29:44.097 UTC] PERF: refreshCache() took 0.0 seconds on ldk queue [ServiceQueue.swift: background(_:_:functionName:) line: 58]
[2026-02-05 10:29:44.098 UTC] DEBUG: Checking 0 pending transfers to spending [BalanceManager.swift: getPendingChannelsSats(transfers:channels:balances:) line: 140]
[2026-02-05 10:29:44.098 UTC] DEBUG: Available channels: 1, Lightning balances: 1 [BalanceManager.swift: getPendingChannelsSats(transfers:channels:balances:) line: 141]
[2026-02-05 10:29:44.098 UTC] DEBUG: Active transfers: 0 [BalanceManager.swift: deriveBalanceState() line: 84]
[2026-02-05 10:29:44.098 UTC] DEBUG: Balances in ldk-node: onchain=73517 lightning=24903 [BalanceManager.swift: deriveBalanceState() line: 87]
[2026-02-05 10:29:44.098 UTC] DEBUG: Balances in state: onchain=73517 lightning=24903 toSavings=0 toSpending=0 lnSubtract=0 ordersOnchainSubtract=0 [BalanceManager.swift: deriveBalanceState() line: 90]
[2026-02-05 10:29:44.401 UTC] DEBUG: Finished transaction sync at tip 1ca7f073d004c7f20f18fbcc84670f172b229c8a6fab858444b9cfcf8f8a1437 in 331ms: 0 confirmed, 0 unconfirmed. - [LDK] [lightning_transaction_sync::electrum:222] [Logger.swift: log(record:) line: 171]
[2026-02-05 10:29:44.401 UTC] INFOℹ️: Sync of Lightning wallet finished in 332ms. - [LDK] [ldk_node::chain::electrum:501] [Logger.swift: log(record:) line: 173]
[2026-02-05 10:29:44.551 UTC] PERF: addPreActivityMetadata(_:) took 0.0 seconds on core queue [ServiceQueue.swift: background(_:_:functionName:) line: 58]
[2026-02-05 10:29:44.575 UTC] INFOℹ️: Paying bolt11: lnbcrt90n1p5cgu8adqqnp4q26m39zn6gsyryywps3yzja2zflxg7qm7fdx7e33h8m0p3gfnup8ypp5u3l09gcervs3ffcpjzm7rukhpjfwfmmeqaqn4mhhamjmqrs8z6yqsp5n7tx0gr75csz3ynn9c7fessw3q8cjuj6lysv2mwzst0updegtj9s9qyysgqcqzp2xqyz5vqrzjq29gjy9sqjrrp48tz7hj2e5vm4l2dukc4csf2mn6qm32u3hted5leapyqqqqqqqvn5qqqqlgqqqqqqgq2qdfpxm52mkan5h8rvpt5fnc7mwcnhx60p8rgqd6w533txdzu9w5m4qputx93y7tx3zaxxl7zzcsg6hh2w4kd0ngp7s3np3aw6vdvfwnspsxfdkr [LightningService.swift: send(bolt11:sats:params:) line: 485]

=== ROUTE NOT FOUND - NETWORK GRAPH DUMP ===

Invoice Info:
  - Payment Hash: e47ef2a3191b2114a70190b7e1f2d70c92e4ef7907413aeef7eee5b00e071688
  - Invoice: lnbcrt90n1p5cgu8adqqnp4q26m39zn6gsyryywps3yzja2zflxg7qm7fdx7e33h8m0p3gfnup8ypp5u3l09gcervs3ffcpjzm7rukhpjfwfmmeqaqn4mhhamjmqrs8z6yqsp5n7tx0gr75csz3ynn9c7fessw3q8cjuj6lysv2mwzst0updegtj9s9qyysgqcqzp2xqyz5vqrzjq29gjy9sqjrrp48tz7hj2e5vm4l2dukc4csf2mn6qm32u3hted5leapyqqqqqqqvn5qqqqlgqqqqqqgq2qdfpxm52mkan5h8rvpt5fnc7mwcnhx60p8rgqd6w533txdzu9w5m4qputx93y7tx3zaxxl7zzcsg6hh2w4kd0ngp7s3np3aw6vdvfwnspsxfdkr

Our Node Info:
  - Node ID: 03f48e6929404bee4a8b076aaeb1cab4ff639499487ec9b07fe964061bae4e7d37

Our Channels:
  Total channels: 1
  Channel 1:
    - Channel ID: 1301c59b779d198d9d6f66f896f7937761dcbe57b27a2837ee0742a47fb119bb
    - Counterparty: 028a8910b0048630d4eb17af25668cdd7ea6f2d8ae20956e7a06e2ae46ebcb69fc
    - Ready: true, Usable: true, Announced: false
    - Outbound: 24549000 msat, Inbound: 708621000 msat

  Channel Summary:
    - Usable channels: 1/1
    - Announced channels: 0/1
    - Total Outbound: 24549000 msat
    - Total Inbound: 708621000 msat

Our Peers:
  Total peers: 1
  Peer 1: 028a8910b0048630d4eb... @ 34.65.86.104:9400

RGS Configuration:
  - RGS Server URL: https://bitkit.stag0.blocktank.to/rgs/snapshot
  - Last RGS Snapshot: Never synced
  - WARNING: Network graph may be empty or stale!

RGS Network Graph Data:
  Total nodes: 0
  Total channels: 0

  Checking for trusted peers in network graph:
    MISSING: 028a8910b0048630d4eb... NOT in graph
  Summary: 0/1 trusted peers found in graph

  First 0 nodes:

=== END NETWORK GRAPH DUMP ===

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.