fix(wallet): channel funding-tx link uses the explorer flow + consent modal above nested modals

The Channels panel's 'Funding tx in Mempool' link still hardcoded the
local app (missed in the explorer rollout): now it routes like every
other tx link — local Mempool when running, else the saved external
explorer, with the first-time consent modal setting it up and then
opening the tx. The consent modal moves to z-3600 so it renders above
the Wallet Settings modal that can trigger it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/components/LightningChannelsPanel.vue

@@ -301,7 +301,7 @@
 <script setup lang="ts">
 import { ref, onMounted } from 'vue'
 import { rpcClient } from '@/api/rpc-client'
-import { useAppLauncherStore } from '@/stores/appLauncher'
+import { useTxExplorer } from '@/composables/useTxExplorer'
 
 defineProps<{ compact?: boolean }>()
 
@@ -390,10 +390,14 @@ function fundingTxid(ch: Channel): string {
   return /^[0-9a-fA-F]{64}$/.test(txid) ? txid : ''
 }
 
+const txExplorer = useTxExplorer()
 function openInMempool(txid: string) {
   if (!txid) return
-  // Overlay the explorer above the current page — never navigate away.
-  useAppLauncherStore().openSession('mempool', { path: `/tx/${txid}` })
+  // Same routing as every other tx link (missed in the first pass —
+  // 2026-07-22): local Mempool app when it's running, otherwise the saved
+  // external explorer, with the first-time consent modal setting it up and
+  // then opening the tx.
+  txExplorer.openTx(txid)
 }
 
 function capacityPercent(amount: number, capacity: number): number {