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/style.css

@@ -164,6 +164,20 @@ select:focus-visible {
 
 /* Mobile: override with tab bar clearance */
 @media (max-width: 767px) {
+  /* Mobile web browsers report 100vh taller than the visible area (the dynamic
+     URL/toolbar chrome). The dashboard is the containing block for the fixed,
+     container-relative panes (the mesh chat/tools panes), so a 100vh-tall
+     container pushes their `bottom` offset below the visible viewport — they
+     slide under the bottom tab bar (which is body-teleported and viewport-fixed,
+     so it stays put). Pin the dashboard to the *dynamic* viewport so the two
+     reference frames line up. No-op in the companion WebView (no browser chrome
+     → dvh == vh), so its layout is unchanged. Doubled class beats Tailwind's
+     `.min-h-screen` (100vh) utility on specificity. */
+  .dashboard-view.dashboard-view {
+    height: 100dvh;
+    min-height: 100dvh;
+  }
+
   .mobile-scroll-pad {
     padding-bottom: calc(var(--mobile-tab-bar-height, 88px) + var(--safe-area-bottom, env(safe-area-inset-bottom, 0px)) + var(--audio-player-height, 0px) + 16px);
   }