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/utils/openExternal.ts

@@ -11,15 +11,37 @@
  */
 interface ArchipelagoNativeBridge {
   openExternal?: (url: string) => void
+  openInApp?: (url: string) => void
+}
+
+function nativeBridge(): ArchipelagoNativeBridge | undefined {
+  return (window as unknown as { ArchipelagoNative?: ArchipelagoNativeBridge }).ArchipelagoNative
 }
 
 export function openExternalUrl(url: string): void {
   if (!url) return
-  const native = (window as unknown as { ArchipelagoNative?: ArchipelagoNativeBridge })
-    .ArchipelagoNative
+  const native = nativeBridge()
   if (native && typeof native.openExternal === 'function') {
     native.openExternal(url)
     return
   }
   window.open(url, '_blank', 'noopener,noreferrer')
 }
+
+/**
+ * Launch an app that can't be embedded in an iframe (X-Frame-Options) from a
+ * mobile surface — with NO "this app opens in a tab" interstitial.
+ *
+ * - Android companion: hand it to the in-app WebView (`openInApp`) so it stays
+ *   inside Archipelago with the native back/forward/reload/close controls.
+ * - Plain mobile browser (PWA): open directly in a new browser tab.
+ */
+export function openInAppOrNewTab(url: string): void {
+  if (!url) return
+  const native = nativeBridge()
+  if (native && typeof native.openInApp === 'function') {
+    native.openInApp(url)
+    return
+  }
+  window.open(url, '_blank', 'noopener,noreferrer')
+}