feat: update template for composite app

[cmorman89]

Overview

• Update plugin.tsx to handle slot === "content" to allow UI to render within composite app content area
• Update tool server config.ts to include:
  • uiConfig.available_in array to specify what contexts are supported (app_portal and/or composite_app)
    • If undefined or empty then Studio defaults to only showing in app portal for backward compatibility
  • uiConfig.navigation array to specify what paths/subroutes should be exposed to composite app sidebar (imports ui-nav-items.ts
• Add ui-nav-items.ts to tool server hold optional AppUINavItem array
  • Used home page and next page as navigation examples for template
  • If empty or undefined, no submenu items appear and Studio defaults to base route ("/")

In Composite App

• Exposes ui-nav-items.ts array
• Allows navigating by clicking items
• Also tracks when navigating internally with app (correct menu item highlights)

Manifest Using Endpoint

• Static manifests also supported, hinting already in editor

Studio Composite App Settings

Studio can see items in ui-nav-items.ts: