fix(setup): wizard navigation round-trips — back to Setup tab, goal-aware channels back button, configure launches the app

- "Back to Goals" now returns to Home's Setup tab (?tab=setup) instead of
  landing on the dashboard tab.
- The channels screen remembers when a setup wizard sent you there
  (?from=goal) — its back button reads "Back to Setup" and returns to the
  wizard; it also now uses the shared BackButton pill instead of a bare
  link.
- "Open & Configure" steps launch the actual app via the app launcher —
  iframe apps overlay on top of the wizard, tab-only apps (BTCPay,
  Nextcloud) open a tab, mobile uses the in-app browser — instead of
  routing to the app-details page.

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

neode-ui/src/views/apps/LightningChannels.vue

@@ -1,12 +1,6 @@
 <template>
   <div class="pb-16 md:pb-4">
-    <!-- Back Button -->
-    <button @click="router.replace('/dashboard/apps/lnd')" class="mb-6 flex items-center gap-2 text-white/70 hover:text-white transition-colors">
-      <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7" />
-      </svg>
-      Back to LND
-    </button>
+    <BackButton :label="backLabel" desktop-margin="mb-6" @click="goBack" />
 
     <h1 class="text-2xl font-bold text-white mb-6">Lightning Channels</h1>
 
@@ -15,8 +9,25 @@
 </template>
 
 <script setup lang="ts">
-import { useRouter } from 'vue-router'
+import { computed } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import BackButton from '@/components/BackButton.vue'
 import LightningChannelsPanel from '@/components/LightningChannelsPanel.vue'
 
+const route = useRoute()
 const router = useRouter()
+
+// When a setup wizard sent us here (?from=goal&goal=<id>), back returns to it.
+const fromGoalId = computed(() =>
+  route.query.from === 'goal' && typeof route.query.goal === 'string' ? route.query.goal : null,
+)
+const backLabel = computed(() => (fromGoalId.value ? 'Back to Setup' : 'Back to LND'))
+
+function goBack() {
+  if (fromGoalId.value) {
+    router.push(`/dashboard/goals/${fromGoalId.value}`)
+  } else {
+    router.replace('/dashboard/apps/lnd')
+  }
+}
 </script>