feat(neode-ui): mobile app-launch UX — store-driven panel, loader, ElectrumX icon

- Mobile launches use the store-driven panel (no route push) so the background
  tab no longer changes and closing returns to where you launched from.
- Tab-only apps open directly (in-app WebView on companion / new tab on PWA) —
  no "this app opens in a tab" interstitial.
- Shared AppLoadingScreen (app icon + progress bar) on the app session and the
  legacy iframe overlay instead of a black screen.
- Pin the dashboard to 100dvh on mobile so the mesh chat/tools panes stop sliding
  under the bottom tab bar in mobile browsers (no-op in the companion WebView).
- ElectrumX/electrs/electrs-ui ids now resolve to the real ElectrumX icon in My Apps.
- isMobile made reactive so overlay/footer/teleport decisions track the viewport.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

neode-ui/src/views/appSession/AppSessionFrame.vue

@@ -1,12 +1,7 @@
 <template>
   <div class="relative flex-1 min-h-0 bg-black/40 overflow-hidden app-session-frame-safe">
     <Transition name="content-fade">
-      <div v-if="loading" class="absolute inset-0 z-10 flex items-center justify-center bg-black/40">
-        <svg class="animate-spin h-8 w-8 text-blue-400" viewBox="0 0 24 24" fill="none">
-          <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4" />
-          <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z" />
-        </svg>
-      </div>
+      <AppLoadingScreen v-if="loading" :icon="appIcon" :title="appTitle" :progress="loadProgress" />
     </Transition>
 
     <!-- ElectrumX sync screen — shown before the real UI while the on-chain
@@ -116,13 +111,15 @@
 </template>
 
 <script setup lang="ts">
-import { nextTick, ref, watch } from 'vue'
+import { nextTick, onBeforeUnmount, ref, watch } from 'vue'
 import type { ElectrsSyncStatus } from '@/composables/useElectrsSync'
+import AppLoadingScreen from '@/components/AppLoadingScreen.vue'
 
 const props = defineProps<{
   appUrl: string
   appId: string
   appTitle: string
+  appIcon: string
   loading: boolean
   iframeBlocked: boolean
   mustOpenNewTab: boolean
@@ -144,6 +141,40 @@ const emit = defineEmits<{
 
 const iframeRef = ref<HTMLIFrameElement | null>(null)
 
+// Faux load progress for the loading screen. Cross-origin iframes give no real
+// progress events, so ease toward ~92% while loading and snap to 100% on load —
+// far better UX than a black screen with a bare spinner.
+const loadProgress = ref(0)
+let progressTimer: ReturnType<typeof setInterval> | null = null
+
+function stopProgress() {
+  if (progressTimer) { clearInterval(progressTimer); progressTimer = null }
+}
+
+function startProgress() {
+  stopProgress()
+  loadProgress.value = 8
+  progressTimer = setInterval(() => {
+    // Decelerate as it approaches the cap so it never visually "finishes" early.
+    const remaining = 92 - loadProgress.value
+    loadProgress.value += Math.max(0.4, remaining * 0.08)
+    if (loadProgress.value >= 92) { loadProgress.value = 92; stopProgress() }
+  }, 180)
+}
+
+watch(() => props.loading, (isLoading) => {
+  if (isLoading) {
+    startProgress()
+  } else {
+    stopProgress()
+    loadProgress.value = 100
+  }
+}, { immediate: true })
+
+watch(() => props.refreshKey, () => { if (props.loading) startProgress() })
+
+onBeforeUnmount(stopProgress)
+
 function focusIframe() {
   iframeRef.value?.focus({ preventScroll: true })
 }