feat: gamepad navigation rewrite, focus styling, container grid system

- Rewrite useControllerNav.ts with clean console-style navigation:
  Sidebar (up/down wrap, right→containers, left→nothing),
  Container tile grid (spatial nav, no wrap at edges),
  Nav bar support (up from containers, down to grid),
  Inner controls (enter drills in, escape exits, trapped arrows)
- Add data-controller-container to Mesh, Fleet, Settings pages
- Fix Home.vue fragment (modals outside root div) causing Vue warnings
- Remove skip-to-content link (handled by controller nav)
- Orange ambient glow focus styling matching glass aesthetic
- Disable PWA service worker in dev mode (fixes HMR caching)
- Add gamepad-nav skill and GAMEPAD-NAV-MAP.md spec document
- 39 tests covering all navigation patterns

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/settings/AccountInfoSection.vue

@@ -114,7 +114,7 @@ init()
   </div>
 
   <!-- Info Grid -->
-  <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-6">
+  <div data-controller-container tabindex="0" class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-6">
     <!-- Server Name Card (editable) -->
     <div class="bg-black/20 rounded-xl px-5 py-4 border border-white/10">
       <div class="flex items-center gap-3 mb-2">

neode-ui/src/views/settings/SystemDangerZone.vue

@@ -48,7 +48,7 @@ async function performFactoryReset() {
 
 <template>
   <!-- Network Diagnostics Link -->
-  <div class="glass-card px-6 py-6 mb-6">
+  <div data-controller-container tabindex="0" class="glass-card px-6 py-6 mb-6">
     <div class="flex items-center justify-between">
       <div>
         <h2 class="text-xl font-semibold text-white/96">{{ t('common.network') }}</h2>
@@ -64,7 +64,7 @@ async function performFactoryReset() {
   </div>
 
   <!-- Reboot Section -->
-  <div class="path-option-card px-6 py-6 mt-6">
+  <div data-controller-container tabindex="0" class="path-option-card px-6 py-6 mt-6">
     <div class="flex items-center justify-between">
       <div>
         <h2 class="text-xl font-semibold text-white/90 mb-1">Reboot</h2>
@@ -109,7 +109,7 @@ async function performFactoryReset() {
   </Teleport>
 
   <!-- Factory Reset Section -->
-  <div class="path-option-card px-6 py-6 mt-6 border-red-500/30">
+  <div data-controller-container tabindex="0" class="path-option-card px-6 py-6 mt-6 border-red-500/30">
     <h2 class="text-xl font-semibold text-red-400/90 mb-3">Factory Reset</h2>
     <p class="text-sm text-white/60 mb-4">
       Wipe all user data, identities, and credentials. Container images are preserved. The node will restart and show the onboarding screen.

neode-ui/src/views/settings/TwoFactorSection.vue

@@ -128,7 +128,7 @@ loadTotpStatus()
 
 <template>
   <!-- Two-Factor Authentication -->
-  <div class="mb-6">
+  <div data-controller-container tabindex="0" class="mb-6">
     <div class="flex items-center justify-between mb-3">
       <div class="flex items-center gap-3">
         <svg class="w-5 h-5 text-white/70" fill="none" stroke="currentColor" viewBox="0 0 24 24">