fix: prevent My Apps crash when installing apps + add filebrowser to demo

The My Apps page went blank after installing apps because pkg['static-files'].icon
was accessed without optional chaining on dynamically installed packages that lack
the static-files property.

- Make static-files optional in PackageDataEntry type
- Add defensive ?.icon access with fallback in Apps.vue and AppDetails.vue
- Add filebrowser to mock backend staticDevApps (enables Cloud page in demo)
- Expand portMappings and marketplaceMetadata for all marketplace apps
- installPackage now uses staticApp() format for consistent data shape

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

neode-ui/src/views/CloudFolder.vue

@@ -112,6 +112,7 @@
         @navigate="cloudStore.navigate($event)"
         @delete="handleDelete"
         @play="handlePlay"
+        @share="handleShare"
       />
 
       <!-- Mini Audio Player -->
@@ -152,6 +153,15 @@
       />
     </div>
 
+    <!-- Share Modal -->
+    <ShareModal
+      v-if="shareTarget"
+      :filename="shareTarget.name"
+      :filepath="shareTarget.path"
+      :is-dir="shareTarget.isDir"
+      @close="shareTarget = null"
+      @saved="shareTarget = null"
+    />
   </div>
 </template>
 
@@ -162,6 +172,7 @@ import { useAppStore } from '../stores/app'
 import { useCloudStore } from '../stores/cloud'
 import CloudToolbar from '../components/cloud/CloudToolbar.vue'
 import FileGrid from '../components/cloud/FileGrid.vue'
+import ShareModal from '../components/cloud/ShareModal.vue'
 import { useAudioPlayer } from '../composables/useAudioPlayer'
 
 const router = useRouter()
@@ -284,6 +295,12 @@ watch(useNativeUI, async (native) => {
   }
 }, { immediate: true })
 
+const shareTarget = ref<{ path: string; name: string; isDir: boolean } | null>(null)
+
+function handleShare(path: string, name: string, isDir: boolean) {
+  shareTarget.value = { path, name, isDir }
+}
+
 const uploadError = ref<string | null>(null)
 const draggingOver = ref(false)
 let dragLeaveTimer: ReturnType<typeof setTimeout> | null = null