frontend: polish app launch and release experience

neode-ui/src/views/web5/Web5SendReceiveModals.vue

@@ -151,6 +151,7 @@
         </div>
         <div v-else class="mb-3 text-center">
           <p class="text-white/50 text-sm mb-2">{{ t('web5.generateFreshAddress') }}</p>
+          <p v-if="unifiedReceiveProcessing" class="text-xs text-white/40">Checking Lightning wallet readiness...</p>
         </div>
       </div>
 
@@ -181,6 +182,7 @@ import { useI18n } from 'vue-i18n'
 import { rpcClient } from '@/api/rpc-client'
 import { useTransportStore } from '@/stores/transport'
 import { useMeshStore } from '@/stores/mesh'
+import { explainReceiveAddressFailure } from '@/utils/bitcoinReceive'
 import { safeClipboardWrite } from './utils'
 
 const { t } = useI18n()
@@ -475,6 +477,9 @@ async function unifiedReceive() {
       receiveInvoiceResult.value = res.payment_request
     } else if (receiveMethod.value === 'onchain') {
       const res = await rpcClient.call<{ address: string }>({ method: 'lnd.newaddress' })
+      if (!res.address) {
+        throw new Error('LND did not return a Bitcoin address')
+      }
       receiveOnchainAddress.value = res.address
       nextTick(() => renderQrCode(res.address, onchainQrCanvas.value))
     } else {
@@ -491,7 +496,9 @@ async function unifiedReceive() {
       emit('balancesChanged')
     }
   } catch (err: unknown) {
-    unifiedReceiveError.value = err instanceof Error ? err.message : t('web5.receiveFailed')
+    unifiedReceiveError.value = receiveMethod.value === 'onchain'
+      ? explainReceiveAddressFailure(err)
+      : err instanceof Error ? err.message : t('web5.receiveFailed')
   } finally {
     unifiedReceiveProcessing.value = false
   }