fix: update LND4 IP and bump ldk-node to rc.26

[ben-kaufman]

This PR:

1. Updates the hardcoded LND4 fallback peer IP from 34.65.186.40 to 34.65.153.174 after the node migration
2. Bumps ldk-node from v0.7.0-rc.18 to v0.7.0-rc.26 which includes a fix for PeerStore::add_peer silently ignoring address updates for existing peers

Without the ldk-node fix, existing installs would keep retrying the stale cached IP indefinitely even after the app pushes the updated address via Node::connect.

Description

LND4's IP changed during a node migration. The hardcoded fallback address in Env is updated, and the ldk-node dependency is bumped to include the peer address upsert fix (synonymdev/ldk-node#53).

Preview

N/A — no UI changes.

QA Notes

1. Update from a previous build where LND4 had the old IP
2. Verify on startup that LND4 connects successfully (check logs for the new IP 34.65.153.174)
3. Fresh install should also connect to LND4 without issues

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