refactor: split Marketplace, Server, Home, AppDetails views; minor frontend quality fixes

- F29-F32: Split 4 views (Marketplace 1293→505, Server 1132→486, Home 1059→394, AppDetails 1036→386)
- F20: Add aria-current="page" to Dashboard nav links
- F21: Add 150ms search debounce in Marketplace and Apps views
- F22: Reduce backdrop-filter blur to 8px on mobile for GPU performance
- F23: Track and clear WebSocket connect check interval in all paths

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

neode-ui/src/views/Apps.vue

@@ -315,7 +315,7 @@ let appsAnimationDone = false
 </script>
 
 <script setup lang="ts">
-import { computed, ref, onMounted, onBeforeUnmount } from 'vue'
+import { computed, ref, watch, onMounted, onBeforeUnmount } from 'vue'
 import { useRouter, useRoute, RouterLink } from 'vue-router'
 import { useI18n } from 'vue-i18n'
 import { useAppStore } from '../stores/app'
@@ -365,8 +365,15 @@ function isServiceContainer(id: string): boolean {
   return false
 }
 
-// Search
+// Search (debounced to avoid filtering on every keystroke)
 const searchQuery = ref('')
+const debouncedSearchQuery = ref('')
+let searchDebounceTimer: ReturnType<typeof setTimeout> | undefined
+watch(searchQuery, (val) => {
+  clearTimeout(searchDebounceTimer)
+  searchDebounceTimer = setTimeout(() => { debouncedSearchQuery.value = val }, 150)
+})
+onBeforeUnmount(() => { clearTimeout(searchDebounceTimer) })
 
 // Category filter (same categories as App Store)
 const selectedCategory = ref('all')
@@ -527,8 +534,8 @@ const sortedPackageEntries = computed(() => {
 })
 
 const filteredPackageEntries = computed(() => {
-  if (!searchQuery.value) return sortedPackageEntries.value
-  const q = searchQuery.value.toLowerCase()
+  if (!debouncedSearchQuery.value) return sortedPackageEntries.value
+  const q = debouncedSearchQuery.value.toLowerCase()
   return sortedPackageEntries.value.filter(([id, pkg]) =>
     (pkg.manifest?.title ?? '').toLowerCase().includes(q) ||
     (pkg.manifest?.description?.short ?? '').toLowerCase().includes(q) ||