feat: companion app improvements and intro overlay

Android: NES controller/keyboard enhancements, WebSocket reconnect,
portrait mode. Backend: remote input handler updates. UI: companion
intro overlay on dashboard, relay improvements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/components/CompanionIntroOverlay.vue

@@ -0,0 +1,98 @@
+<template>
+  <Teleport to="body">
+    <Transition name="overlay-fade">
+      <div
+        v-if="visible"
+        class="fixed inset-0 flex items-end sm:items-center justify-center p-4 z-[3000]"
+        @click.self="dismiss"
+      >
+        <div class="absolute inset-0 bg-black/40 backdrop-blur-sm" />
+        <div
+          class="glass-card p-5 w-full max-w-sm relative z-10 mb-20 sm:mb-0"
+          @click.stop
+        >
+          <!-- Icon -->
+          <div class="flex justify-center mb-3">
+            <div class="w-12 h-12 rounded-xl bg-orange-500/15 border border-orange-500/30 flex items-center justify-center">
+              <svg class="w-7 h-7 text-orange-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <rect x="3" y="7" width="18" height="11" rx="3" stroke-width="1.5" />
+                <rect x="7.5" y="10" width="2" height="5" rx="0.5" fill="currentColor" />
+                <rect x="6" y="11.5" width="5" height="2" rx="0.5" fill="currentColor" />
+                <circle cx="16" cy="11" r="1.2" fill="currentColor" />
+                <circle cx="14" cy="13.5" r="1.2" fill="currentColor" />
+              </svg>
+            </div>
+          </div>
+
+          <h3 class="text-lg font-semibold text-white text-center mb-2">Remote Companion</h3>
+          <p class="text-sm text-white/60 text-center mb-4 leading-relaxed">
+            Control your node from another device. Install the
+            <span class="text-orange-400 font-medium">Archipelago</span>
+            companion app on your phone, connect to the same network, and use it as a
+            gamepad or keyboard.
+          </p>
+
+          <div class="flex flex-col gap-2 text-xs text-white/40">
+            <div class="flex items-center gap-2">
+              <span class="w-5 h-5 rounded-full bg-white/10 flex items-center justify-center text-white/50 text-[10px] font-bold">1</span>
+              <span>Install the APK on your phone</span>
+            </div>
+            <div class="flex items-center gap-2">
+              <span class="w-5 h-5 rounded-full bg-white/10 flex items-center justify-center text-white/50 text-[10px] font-bold">2</span>
+              <span>Enter your node address and password</span>
+            </div>
+            <div class="flex items-center gap-2">
+              <span class="w-5 h-5 rounded-full bg-white/10 flex items-center justify-center text-white/50 text-[10px] font-bold">3</span>
+              <span>Use D-pad &amp; buttons or keyboard to control apps</span>
+            </div>
+          </div>
+
+          <button
+            class="mt-4 w-full py-2.5 rounded-lg bg-orange-500/20 border border-orange-500/30
+                   text-orange-400 text-sm font-medium hover:bg-orange-500/30 transition-colors"
+            @click="dismiss"
+          >
+            Got it
+          </button>
+        </div>
+      </div>
+    </Transition>
+  </Teleport>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted } from 'vue'
+
+const STORAGE_KEY = 'neode_companion_intro_seen'
+
+const visible = ref(false)
+
+onMounted(() => {
+  try {
+    if (localStorage.getItem(STORAGE_KEY) !== '1') {
+      // Delay slightly so it doesn't compete with login animation
+      setTimeout(() => { visible.value = true }, 5000)
+    }
+  } catch {
+    // localStorage unavailable
+  }
+})
+
+function dismiss() {
+  visible.value = false
+  try {
+    localStorage.setItem(STORAGE_KEY, '1')
+  } catch {
+    // ignore
+  }
+}
+</script>
+
+<style scoped>
+.overlay-fade-enter-active { transition: opacity 0.3s ease; }
+.overlay-fade-leave-active { transition: opacity 0.2s ease; }
+.overlay-fade-enter-from,
+.overlay-fade-leave-to { opacity: 0; }
+.overlay-fade-enter-active .glass-card { transition: transform 0.3s ease; }
+.overlay-fade-enter-from .glass-card { transform: translateY(20px); }
+</style>