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/composables/useMessageToast.ts

@@ -43,6 +43,11 @@ export function useMessageToast() {
         lastMessageCount.value = msgs.length
       }
     } catch (e) {
+      // Stop polling on auth failure — session expired, no point retrying
+      if (e instanceof Error && /401|Unauthorized/i.test(e.message)) {
+        stopPolling()
+        return
+      }
       console.error('Failed to load messages:', e)
     } finally {
       loadingMessages.value = false