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/Dashboard.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="min-h-screen flex relative dashboard-view" :class="{ 'glass-throw-active': showZoomIn }">
     <!-- Skip to main content link for keyboard users -->
-    <a href="#main-content" class="skip-to-content">{{ t('common.skipToContent') }}</a>
+    <!-- Skip-to-content handled by controller nav sidebar→main transition -->
     <!-- Background container with 3D perspective - full width to avoid letterboxing -->
     <div class="bg-perspective-container">
       <!-- Background - primary layer (visible for all routes, transitions out only for detail pages) -->
@@ -126,7 +126,6 @@
 <script setup lang="ts">
 import { computed, ref, watch, onMounted, onBeforeUnmount } from 'vue'
 import { RouterView, useRouter, useRoute } from 'vue-router'
-import { useI18n } from 'vue-i18n'
 import { useAppStore } from '../stores/app'
 import { useAppLauncherStore } from '../stores/appLauncher'
 import AppSession from '@/views/AppSession.vue'
@@ -140,8 +139,6 @@ import HealthNotifications from '@/views/dashboard/HealthNotifications.vue'
 import { useRouteTransitions, isDetailRoute, ROUTE_BACKGROUNDS } from '@/views/dashboard/useRouteTransitions'
 import '@/views/dashboard/dashboard-styles.css'
 
-const { t } = useI18n()
-
 const router = useRouter()
 const route = useRoute()
 const store = useAppStore()