Add set_title_launchpad event for SAP Fiori Launchpad shell

[oblomov-dev]

Summary

This PR introduces a new set_title_launchpad frontend event that allows apps running inside an SAP Fiori Launchpad shell to set the launchpad title separately from the browser tab title.

Key Changes

• Added set_title_launchpad event to the frontend events list in the event navigation documentation
• Updated the title cookbook documentation with:
  • Clear guidance on when to use set_title vs set_title_launchpad
  • Code example showing how to invoke set_title_launchpad with the ShellUIService
  • Explanation that set_title_launchpad forwards to the shell's ShellUIService instead of document.title
• Updated the custom controls deprecation table to reference the new set_title_launchpad event

Implementation Details

• The new event provides a dedicated mechanism for launchpad-aware title management, replacing the need for custom controls
• set_title continues to handle browser tab/window titles in standalone mode
• set_title_launchpad is specifically for apps running within an SAP Fiori Launchpad shell environment

https://claude.ai/code/session_01B32aq8HwaTFjzeQMomHsHg