fix(ui): a warming-up app reads as "starting", not "App not reachable"

A container that is up but hasn't answered its probe yet rendered the hard
failure overlay — padlock icon, "App not reachable", "the container is
stopped". Both bitcoind (RPC -28 for its whole warm-up) and lnd (unreachable
until the wallet unlocks) sit in that window on every boot, so the node
looked broken while it was working normally.

The retry machinery was already correct: 6 × 10s of automatic re-checks, and
the app appears on its own when it answers. Only the headline was wrong. While
those retries are in flight AND the package reports running/starting/restarting
(or health "starting"), the overlay now shows the app's own pulsing icon,
"<App> is starting…", and says the container is running. Once retries are
exhausted the failure is real again and the original copy returns.

Follows the ElectrumX sync-screen precedent already in this file, which
suppresses the same overlay for the same reason. The explicit blocked-reason
and must-open-new-tab paths are untouched.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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

@@ -68,14 +68,18 @@
     <Transition name="content-fade">
       <div v-if="iframeBlocked && !electrsSync" class="absolute inset-0 z-10 flex flex-col items-center justify-center">
         <div class="text-center px-8">
-          <div class="w-16 h-16 mx-auto mb-4 rounded-2xl bg-white/5 border border-white/10 flex items-center justify-center">
-            <svg class="w-8 h-8 text-white/40" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <!-- Warm-up uses the app's own icon, pulsing, rather than the padlock:
+               the padlock reads as "blocked/denied" and this state is neither. -->
+          <div class="w-16 h-16 mx-auto mb-4 rounded-2xl bg-white/5 border border-white/10 flex items-center justify-center overflow-hidden" :class="{ 'animate-pulse': warmingUp }">
+            <img v-if="warmingUp" :src="appIcon" :alt="appTitle" class="w-full h-full object-cover" @error="handleImageError" />
+            <svg v-else class="w-8 h-8 text-white/40" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z" />
             </svg>
           </div>
-          <h3 class="text-lg font-semibold text-white mb-2">{{ blockedReason ? blockedTitle : (mustOpenNewTab ? 'This app opens in a new tab' : 'App not reachable') }}</h3>
+          <h3 class="text-lg font-semibold text-white mb-2">{{ warmingUp ? `${appTitle} is starting…` : blockedReason ? blockedTitle : (mustOpenNewTab ? 'This app opens in a new tab' : 'App not reachable') }}</h3>
           <p class="text-white/50 text-sm mb-6">
             <template v-if="mustOpenNewTab">{{ appTitle }} sets security headers that prevent iframe embedding.<br>Open it in a new browser tab instead.</template>
+            <template v-else-if="warmingUp">The container is running but hasn't finished warming up yet.<br>This screen opens on its own as soon as it answers.<span v-if="autoRetryCount > 0" class="block text-yellow-400/70">Checking again automatically ({{ autoRetryCount }})...</span></template>
             <template v-else-if="blockedReason">{{ blockedReason }}<br><span v-if="autoRetryCount > 0" class="text-yellow-400/70">Checking again automatically ({{ autoRetryCount }})...</span></template>
             <template v-else>{{ appTitle }} may still be starting up or the container is stopped.<br><span v-if="autoRetryCount > 0" class="text-yellow-400/70">Retrying automatically ({{ autoRetryCount }})...</span></template>
           </p>
@@ -131,6 +135,9 @@ const props = defineProps<{
   refreshKey: number
   blockedReason?: string
   blockedTitle?: string
+  // True while the container is up but its probe hasn't answered yet and the
+  // auto-retries are still in flight — a warm-up, not a failure.
+  warmingUp?: boolean
   // Non-null only for ElectrumX while its index is still building — shows the
   // sync screen and gates the iframe until status flips to "synced".
   electrsSync?: ElectrsSyncStatus | null